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BEGIN:VEVENT
DTSTART;TZID=Europe/Brussels:20260415T100000
DTEND;TZID=Europe/Brussels:20260415T110000
DTSTAMP:20260623T211502
CREATED:20260527T150125Z
LAST-MODIFIED:20260527T150337Z
UID:1771-1776247200-1776250800@mmelo.eu
SUMMARY:Online Lecture by Prof. Yoshitaka Adachi
DESCRIPTION:Deciphering the “Feelings” of Steel: 35 Years of the Digital Revolution in Microstructure Design\n\n\n\n\n\n\n\n\n\nDepartment of Materials Design Innovation Engineering\, Nagoya University\, Japan \n\n\n\n\n\n\n\nTitle: Deciphering the “Feelings” of Steel: 35 Years of the Digital Revolution in Microstructure Design. \n\n\n\nAbstract: This lecture reflects on a 35-year journey to “understand the feelings of steel” by transforming visual microstructures into quantifiable digital data. Traditionally\, identifying and segmenting complex steel structures was a grueling manual process taking months; however\, the integration of deep learning (such as U-NET) has reduced this task to mere minutes.Key innovations highlighted in the research include:Mathematical Quantification: Moving beyond basic metrics like grain size\, the author employs advanced mathematical frameworks – Topology (Euler characteristics)\, Differential Geometry (curvature)\, and Persistent Homology – to rigorously quantify the connectivity and morphology of steel.AI-Driven Analysis: The use of Convolutional Neural Networks (CNN) for “image regression” allows researchers to directly link microstructural images to mechanical properties\, such as tensile strength\, without manual feature extraction.Generative Material Design: By utilizing Generative Adversarial Networks (GANs) and automated 3D observation tools like “Genus_3D\,” the research team has drastically accelerated the cycle of data acquisition and virtual material design. \n\n\n\n \n\n\n\nThis session was chaired by prof. Hossein Beladi (Ghent University/TU Delft)
URL:https://mmelo.eu/event/online-lecture-by-prof-yoshitaka-adachi/
CATEGORIES:Online Lectures
ATTACH;FMTTYPE=image/jpeg:https://mmelo.eu/wp-content/uploads/2026/05/Yoshitaka-Adachi-100x13396dpi.jpg
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Brussels:20260319T150000
DTEND;TZID=Europe/Brussels:20260319T160000
DTSTAMP:20260623T211502
CREATED:20260311T213632Z
LAST-MODIFIED:20260429T193043Z
UID:1754-1773932400-1773936000@mmelo.eu
SUMMARY:Online Lecture by Prof. Manon Rolland
DESCRIPTION:Improving scrap recycling: thermodynamic\, microstructural\, technical\, economical and societal aspects\n\n\n\n\n\n\n\n\n\nUMET – Unité Matériaux et Transformations\,Université de Lille\, CNRS\, INRAE\, Centrale Lille\, UMR 8207F-59000 Lille\, France \n\n\n\n\n\n\n\nTitle: Improving scrap recycling: thermodynamic\, microstructural\, technical\, economical and societal aspects. \n\n\n\nAbstract: Steel production is estimated to participate in 8% of the total world CO2 emission. This is due to the use of environmentally impacting technologies like blast furnaces. Additionally\, this primary production and steel recycling brings social issues. To decrease the overall impact of steel production\, a part of the solution is to use Electric Arc Furnaces (EAF) and scrap. Nevertheless\, it is worth highlighting that scrap is already quite used in the production. However\, due the high variety of alloys in service and due to some limits in sorting (technological and economical)\, most of the so-called post-consumer scrap is downcycled as it contains tramp elements. It is indeed used for less demanding application in terms of impurities quantity and consequent microstructures compared to the first alloy life. Different solutions are envisaged to improve scrap recycling. For instance one can produce simpler materials in terms of composition or assembly. Some groups also explore the potential of purification of the mixed liquid melt to remove tramp elements. It is also possible to optimize the effect of the presence of tramp elements or to improve the metallic matter flows. The two latter suggestions will be investigated in this talk to investigate\, first\, the effect of tramp elements on thermodynamics and on the kinetics of phases transformations. Secondly\, scenarios to optimize metallic matter flows handling across the territories and in between the different metallurgy chain actors will be presented and analyzed to explore solutions to reduce the impact of steel production. \n\n\n\n \n\n\n\nThis session was chaired by Joakim Odqvist (KTH Royal Institute of Technology)
URL:https://mmelo.eu/event/online-lecture-by-prof-manon-rolland/
CATEGORIES:Online Lectures
ATTACH;FMTTYPE=image/jpeg:https://mmelo.eu/wp-content/uploads/2026/03/Manon-Rolland-100x13396dpi.jpg
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Brussels:20260219T150000
DTEND;TZID=Europe/Brussels:20260219T160000
DTSTAMP:20260623T211502
CREATED:20260216T170502Z
LAST-MODIFIED:20260220T123816Z
UID:1748-1771513200-1771516800@mmelo.eu
SUMMARY:Online Lecture by Prof. Ronald Schnitzer
DESCRIPTION:Microstructural changes due to increased use of scrap in steel productionRonald Schnitzer\, Lukas Hatzenbichler\, Nikolaus Kostwein\, Oleksandr Glushko\n\n\n\n\n\n\n\n\n\nHead of Chair of Physical MetallurgyChristian Doppler Laboratory for Knowledge-based Design of Advanced Steels\,Department of Materials Science\, Technical University of Leoben\, Austria \n\n\n\n\n\n\n\nTitle: Microstructural changes due to increased use of scrap in steel productionRonald Schnitzer\, Lukas Hatzenbichler\, Nikolaus Kostwein\, Oleksandr Glushko. \n\n\n\nAbstract: The transformation of the production routes in the steel industry from blast furnaces to electric arc furnaces enables an increased use of scrap and thus significantly reduced CO2 emissions in the manufacturing process. This change will inevitably increase the amount of undesirable tramp and trace elements in steel products. Knowing the exact amount and type of elements is crucial to determine their influence on the microstructure and mechanical properties. In the course of the presented work\, phase transformations and scale-bridging microstructure characterization\, including high-resolution methods such as atom probe tomography and in situ high-energy X-ray diffraction\, were performed on alloys with different contents of tramp and trace elements. In addition\, machine learning methods were used to support the evaluation of microstructures. The results show that impurity elements not only shift the phase fields for longer periods of time\, but also lower the phase transformation temperatures. In addition\, it has been observed that impurity elements inhibit the growth of the former austenitic grains by accumulating at the grain boundaries at high temperatures. There was also a decrease in notched impact strength with increasing amounts of Sn\, Sb and Cu. Using atom probe tomography\, nm-sized Cu clusters along the grain boundaries as well as a significant enrichment of Sn and Sb at grain boundaries could be detected. \n\n\n\n \n\n\n\nThis session was chaired by prof. Erik Offerman (Delft University of Technology\, the Netherlands.)
URL:https://mmelo.eu/event/online-lecture-by-prof-ronald-schnitzer/
CATEGORIES:Online Lectures
ATTACH;FMTTYPE=image/jpeg:https://mmelo.eu/wp-content/uploads/2026/02/Ronald-Schnitzer-100x13396dpi.jpg
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Brussels:20260115T150000
DTEND;TZID=Europe/Brussels:20260115T160000
DTSTAMP:20260623T211502
CREATED:20260216T164759Z
LAST-MODIFIED:20260216T164803Z
UID:1744-1768489200-1768492800@mmelo.eu
SUMMARY:Online Lecture by dr. Habil. Yudong Zhang
DESCRIPTION:Crystallographic Analysis\, ‘a Forensic Tool’: from Revealing Metallurgical Micromechanisms to Streamlining TEM Workflows\n\n\n\n\n\n\n\n\n\nLEM3 – UMR CNRS 7239\, Université de Lorraine\, France \n\n\n\n\n\n\n\nTitle: Crystallographic Analysis\, ‘a Forensic Tool’: from Revealing Metallurgical Micromechanisms to Streamlining TEM Workflows. \n\n\n\nAbstract: As both a Research Engineer and Dr. Habil.\, I lead a dual mission: advancing metallurgical research while managing technical services for Transmission Electron Microscopy (TEM). By leveraging the crystallographic expertise that is a hallmark of our group at LEM3\, I integrate orientation-related analysis into both my primary research and daily technical operations. In this lecture\, I will present three case studies that demonstrate the analytical power and versatility of this expertise.The first example shows the formation mechanism of the sigma phase in a CoCrV medium-entropy alloy (MEA)\, driven by partial dislocation activity during annealing. The alloy possesses low SFE and belongs to the non-sigma formation family at equilibrium. However\, when annealed from the cold-rolled state\, nano-sized sigma particles were precipitated ultra-rapidly with heating (20°C/s). Detailed crystallographic analysis allowed us to resolve the structure similarity of the partially dislocated FCC regions to the sigma structure. This alignment elucidates the transformation mechanism that facilitates the ultra-rapid formation of the sigma phase. Consequently\, the crystallographic texture of the sigma phase is governed by the orientation of the most active slip planes via the FCC {111} to sigma {001} heredity.The second example demonstrates how crystallographic analysis resolved the micro mechanisms of a high-temperature α phase in a TiAl alloy during hot compression. In this thermomechanical treatment\, the recrystallization experienced three steps: (ⅰ) stress-induced grain boundary bulging and formation of symmetrical-tilt low-angle boundaries characterized by〈0001〉disorientation axis induced by prismatic slip; (ⅱ) evolution of low-angle boundaries into asymmetrical-tilt boundaries characterized by 〈101x〉disorientation axis by local basal slip\, or tilt-twist boundaries characterized by 〈112y〉disorientation axis through rotational grain boundary sliding\, resulting in the formation of subgrains from the boundary bulges; (ⅲ) the detachment of the subgrains and the mixing of the detached subgrains by grain boundary sliding. The three steps happened continuously and repeatedly from the boundary regions toward grain interior till the completion of recrystallization.The third example presents our newly developed software-assisted crystallographic approach for achieving specific beam orientations for TEM operation. It is known that TEM imaging relies on specific orientation of the incident electron beam relative to the sample. Traditionally\, achieving optimal alignment has relied on empirical trial-and-error\, requiring user expertise and considerable time. To overcome this limitation\, we worked out a new method supported by a dedicatedly developed module in in-house ATEX-software. This method leverages the determined crystal orientation\, expressed by Euler angles relative to the sample holder. It establishes the geometric relations between the incident beam\, the desired diffraction vector ɡ (for two-beam conditions) or a zone-axis (for on-axis imaging) and the tilt/rotation axes of the holder. Using this information\, the software provides precise tilt and rotation instructions to efficiently reach the desired beam orientation. Unlike conventional methods\, this approach significantly reduces the alignment effort\, typically requiring no more than two tilts of the sample holder. \n\n\n\n \n\n\n\nThis session was chaired by prof. Leo Kestens (Ghent University)
URL:https://mmelo.eu/event/online-lecture-by-dr-habil-yudong-zhang/
CATEGORIES:Online Lectures
ATTACH;FMTTYPE=image/png:https://mmelo.eu/wp-content/uploads/2026/02/Habil.-Yudong-Zhang-100x13396dpi.png
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Brussels:20251218T150000
DTEND;TZID=Europe/Brussels:20251218T160000
DTSTAMP:20260623T211502
CREATED:20260211T165417Z
LAST-MODIFIED:20260216T162053Z
UID:1728-1766070000-1766073600@mmelo.eu
SUMMARY:Online Lecture by dr. María Teresa Pérez Prado
DESCRIPTION:Additive manufacturing of energy efficient electric motors\n\n\n\n\n\n\n\n\n\nHead of the Sustainable Metallurgy group\, IMDEA Materials Institute\, Spain \n\n\n\n\n\n\n\nTitle: Additive manufacturing of energy efficient electric motors. \n\n\n\nAbstract: Assuming an average loss level of 5%\, the energy dissipated by the ~8 billion electric motors operating in the EU corresponds to roughly 30% of the total energy consumption of a country such as Spain. Additive manufacturing (AM) of Fe-based metallic glasses offers a potential route to produce e-motor components that mitigate these losses\, owing to their superior soft-magnetic properties and near-net-shape capability. Nevertheless\, substantial obstacles persist for AM processing of these materials: suppressing crystallization to preserve the amorphous phase\, minimizing porosity and residual stresses\, ensuring adequate feedstock processability\, and tuning magnetic properties through post-processing. Overcoming these challenges requires an integrated approach that couples alloy design\, process optimization\, and advanced characterization.This lecture will review recent progress on process-parameter optimization for AM of Fe-based metallic glasses [1-3] and will highlight strategies to precisely regulate thermal histories during printing so as to limit defects and maintain amorphicity in components with complex geometries. It will be shown that a combined methodology\, linking computational modeling with targeted experimental validation\, can deliver tailored processing windows that improve both manufacturability and performance of Fe-based metallic-glass parts. The lecture will conclude with a discussion of how these advances move AM closer to enabling high-efficiency electric motors with reduced energy losses.[1] M. Rodríguez-Sánchez\, A. D. Boccardo\, S. Sadanand\, A. Ghavimi\, R. Busch\, P. Sharangi\, E. Ferrara\, G. Barrera\, P. Tiberto\, D. Tourret\, I. Gallino\, M. T. Pérez-Prado\, Laser powder bed fusion of an Fe-based metallic glass using time delays\, Additive Manufacturing\, 110 (2025) 104922.[2] S. Sadanand\, M. Rodríguez-Sánchez\, A. Ghavimi\, R. Busch\, P. Sharangi\, P.M. Tiberto\, E. Ferrara\, G. Barrera\, L. Thorsson\, H.J. Wachter\, I. Gallino\, M.T. Pérez-Prado\, Laser powder bed fusion of a nanocrystalline Finemet Fe-based metallic glass for soft magnetic applications\, Journal of Laser Applications\, 36 (2024) 042029.[3] M. Rodríguez-Sánchez\, S. Sadanand\, A. Ghavimi\, R. Busch\, P.M. Tiberto\, E. Ferrara\, G. Barrera\, L. Thorsson\, H.J. Wachter\, I. Gallino\, M.T. Pérez-Prado\, Relating laser powder bed fusion process parameters to (micro)structure and to soft magnetic behaviour in a Fe-based bulk metallic glass\, Materialia\, 35 (2024) 102111. \n\n\n\n \n\n\n\nThis session was chaired by prof. María Santofimia (TU Delft)
URL:https://mmelo.eu/event/online-lecture-by-dr-maria-teresa-perez-prado/
CATEGORIES:Online Lectures
ATTACH;FMTTYPE=image/png:https://mmelo.eu/wp-content/uploads/2026/02/Maria-Teresa-Perez-Prado-100x13396dpi.png
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Brussels:20251120T150000
DTEND;TZID=Europe/Brussels:20251120T160000
DTSTAMP:20260623T211502
CREATED:20260216T161330Z
LAST-MODIFIED:20260216T161331Z
UID:1733-1763650800-1763654400@mmelo.eu
SUMMARY:Online Lecture by Prof. Amy Clarke
DESCRIPTION:Science-based Advanced Manufacturing of Metals and Alloys\n\n\n\n\n\n\n\n\n\n1)Los Alamos National Laboratory\, Sigma Manufacturing Science Division\, Los Alamos\, NM\, 87545\, USA \n\n\n\n2)Colorado School of Mines\, Department of Metallurgical and Materials Engineering\, Golden\, CO\, 80401\, USA \n\n\n\n\n\n\n\nTitle: Science-based Advanced Manufacturing of Metals and Alloys. \n\n\n\nAbstract: Solidification is the first step encountered during the processing of metals and alloys. Significant opportunity exists to not only employ conventional processes like metal casting\, but also emerging processes like additive manufacturing (AM) that typically produce large temperature gradients\, high solidification rates\, and repeated cycles of heating and cooling. The local conditions experienced during solidification processes (e.g.\, thermal gradients and solid-liquid interface velocities) dictate microscopic structure (i.e.\, microstructure) evolution. Here we visualize solidification dynamics during metal casting\, directional solidification\, and simulated AM by real-time imaging with protons\, synchrotron x-rays\, and electrons and computational modeling to link processing conditions to microstructure development. We also explore the role of subsequent solid state phase transitions on final microstructural state. A deeper understanding of phase transitions is needed to optimize processing conditions\, predict and control microstructure evolution\, and achieve advanced manufacturing of metals and alloys. \n\n\n\n \n\n\n\nThis session was chaired by Joakim Odqvist (KTH). \n\n\n\nYou can follow this online lecture through ZOOM.Please fill out your information below and we will send you the meeting ID and passcode.
URL:https://mmelo.eu/event/online-lecture-by-prof-amy-clarke/
CATEGORIES:Online Lectures
ATTACH;FMTTYPE=image/jpeg:https://mmelo.eu/wp-content/uploads/2026/02/Amy-Clarke-100x13396dpi.jpg
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Brussels:20251016T150000
DTEND;TZID=Europe/Brussels:20251016T160000
DTSTAMP:20260623T211502
CREATED:20251015T112015Z
LAST-MODIFIED:20260216T143727Z
UID:1718-1760626800-1760630400@mmelo.eu
SUMMARY:Online Lecture by Prof. Rafael Schouwenaars
DESCRIPTION:Statistical micro-mechanics of dislocations\n\n\n\n\n\n\n\n\n\n1)Departamento de Materiales y Manufactura\, Facultad de Ingenieria\, Universidad Nacional Autonoma de Mexico\, Ciudad de Mexico\, Mexico \n\n\n\n2)Ghent University\, Materials Science and Technology\, Department of Electromechanical\, Systems and Metals Engineering\, Ghent\, Belgium \n\n\n\n\n\n\n\nTitle: Statistical micro-mechanics of dislocations. \n\n\n\nAbstract: Traditionally\, the micro-mechanics of defects in solids has focused on the stress fields and elastic strains induced by inclusions and dislocations. The strength of alloys is then assumed to depend on the interaction between the stress fields of crystal defects\, with the dislocation pileup at grain boundaries being the classical example. To explain strain hardening\, dislocation slip and storage must be included\, leading to the Kocks-Mecking (KM) model\, which calculates the stress from dislocation density through the Taylor equation. This lecture revisits the KM model and presents its mathematical foundations\, to investigate how it can be modified to include additional hardening effects. The Taylor equation will be derived from a balance equation for dislocation emission and storage\, based on the statistical properties of a plane Poisson process. The resulting ordinary differential equation (ODE) inherently provides a way to include particle hardening. Then\, the role of grain boundaries (GB) as sources and sinks for dislocations will be explained. By calculating how the slip length is affected by the presence of the GBs\, a modification of the KM equation is found without the introduction of additional fitting parameters. Comparison with literature data shows that the new ODE correctly predicts the grain size effect (GSE). It is concluded that strain hardening\, particle strengthening and the GSE can be modelled by a set of two ODEs. The role of shearable precipitates and solid solution can be included in a lattice friction term\, which will be studied in more detail in future research. \n\n\n\n \n\n\n\nThis session was chaired by prof. Leo Kestens (Ghent University)
URL:https://mmelo.eu/event/online-lecture-by-prof-rafael-schouwenaars/
CATEGORIES:Online Lectures
ATTACH;FMTTYPE=image/png:https://mmelo.eu/wp-content/uploads/2025/10/Rafael-Schouwenaars-100x13396dpi.png
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Brussels:20250918T160000
DTEND;TZID=Europe/Brussels:20250918T170000
DTSTAMP:20260623T211502
CREATED:20250912T175655Z
LAST-MODIFIED:20251015T110110Z
UID:1693-1758211200-1758214800@mmelo.eu
SUMMARY:Online Lecture by Dr. Niels van Dijk
DESCRIPTION:Small Angle Neutron Scattering on Precipitation in Steels\n\n\n\n\n\n\n\n\n\nFundamental Aspects of Materials and Energy groupDelft University of TechnologyThe Netherlands \n\n\n\n\n\n\n\nTitle: Small Angle Neutron Scattering on Precipitation in Steels. \n\n\n\nAbstract: My research mainly focuses on neutron scattering and synchrotron X-ray studies on metal alloys and magnetic materials. In this presentation the use of neutron scattering to study the kinetics of nanoscale precipitation in steels will be discussed. Nanoscale precipitates are extensively used to strengthen metal alloys. In order to optimise this process detailed information on the precipitate size distribution is required. Destructive techniques like transmission-electron microscopy and atom-probe tomography provide highly detailed information on individual precipitates in a limited volume. Small angle neutron scattering (SANS) on the other hand provides non-destructive in-situ information on the nanoscale particle size distribution of a relatively large sample volume (typically 10-100 mm^3). The high penetrating power of the neutrons allow for in-situ time-resolved experiments that can monitor the evolution of the precipitate size distribution as a function of aging time at elevated temperatures. The SANS method will be introduced and several applications for iron alloys and nanosteels will be discussed. \n\n\n\n \n\n\n\nThis session was chaired by prof. Leo Kestens (Ghent University)
URL:https://mmelo.eu/event/online-lecture-by-dr-niels-van-dijk/
CATEGORIES:Online Lectures
ATTACH;FMTTYPE=image/png:https://mmelo.eu/wp-content/uploads/2025/06/Niels-van-Dijk-100x13396dpi.png
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Brussels:20250619T150000
DTEND;TZID=Europe/Brussels:20250619T160000
DTSTAMP:20260623T211502
CREATED:20250620T125629Z
LAST-MODIFIED:20250623T100138Z
UID:1702-1750345200-1750348800@mmelo.eu
SUMMARY:Online Lecture by dr. Greta Lindwall
DESCRIPTION:Advanced experimental characterization and computational modelling for additive manufacturing of steels\n\n\n\n\n\n\n\n\n\nDepartment of Materials Science and Engineering\,KTH Royal Institute of Technology\,Sweden \n\n\n\n\n\n\n\nTitle: Advanced experimental characterization and computational modelling for additive manufacturing of steels. \n\n\n\nAbstract: Understanding microstructure evolution during additive manufacturing (AM) of metallic materials requires insight into transient thermal and phase transformation phenomena. While post-process characterization provides valuable data\, it cannot fully capture the dynamic mechanisms at play during solidification and subsequent phase transformations. In this work\, we perform in situ observations using synchrotron X-rays combined with computational thermodynamics and kinetics to study real-time microstructure evolution during laser- and electron-beam based AM. To replicate conditions typical for AM while enabling in situ X-ray studies\, dedicated AM sample environments are required. Here\, the construction of an electron beam-powder bed fusion (PBF-EB) sample environment is described [1]. Both high-speed X-ray radiography and diffraction are applied to image process dynamics and to follow microstructure evolution during PBF-EB\, respectively. The emphasis is on how in situ X-ray diffraction can reveal solidification behavior and solid-state phase transformations in steels during AM\, and how these experimental data contribute to the validation and development of modeling approaches.[1] H-H. König\, N. Semjatov et al.\, MiniMelt: An instrument for real-time tracking of electron beam additive manufacturing using synchrotron x-ray techniques\, Rev. Sci. Instrum. 94\, 125103 (2023) \n\n\n\n \n\n\n\nThis session was chaired by Joakim Odqvist (KTH Royal Institute of Technology)
URL:https://mmelo.eu/event/online-lecture-by-dr-greta-lindwall/
CATEGORIES:Online Lectures
ATTACH;FMTTYPE=image/jpeg:https://mmelo.eu/wp-content/uploads/2025/06/Greta-Lindwall-100x13396dpi.jpg
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Brussels:20250516T150000
DTEND;TZID=Europe/Brussels:20250516T160000
DTSTAMP:20260623T211502
CREATED:20250620T110205Z
LAST-MODIFIED:20250620T110206Z
UID:1694-1747407600-1747411200@mmelo.eu
SUMMARY:Online Lecture by dr. Stefan Zaefferer
DESCRIPTION:Bringing the TEM to SEM: An introduction to the basics of controlled electron channelling contrast imaging (cECCI) and its application to the study of extended defects in metals and alloys\n\n\n\n\n\n\n\n\n\nMax Planck Institute for Sustainable Materials\,Department Microstructure Physics and Alloy Design\,Germany \n\n\n\n\n\n\n\nTitle: Bringing the TEM to SEM: An introduction to the basics of controlled electron channelling contrast imaging (cECCI) and its application to the study of extended defects in metals and alloys. \n\n\n\nAbstract: Electron channelling contrast imaging (ECCI) is an SEM based technique for observation of extended crystal lattice defects like dislocations and stacking faults. It exploits the dependence of the backscatter electron intensity on crystal orientation and atomic order. For ECCI a crystalline sample is observed with the backscattered electron signal. The basic principle of contrast formation is that electrons channel into a crystal lattice when the incident beam enters the lattice along the Bragg angle of a set of crystal planes. In this case\, very few electrons are backscattered and the observed crystal appears dark. Every defect that disturbs the order of the lattice planes\, in contrast\, leads to backscattering and is visible in the ECC image as bright features in a dark grain. Dislocations\, for example\, appear as bright lines\, stacking faults as bright areas with similar contrast features as those known from transmission electron microscopy (TEM). Important for good imaging is a small beam convergence for good contrast\, a small spot size for good resolution and a high beam current for low-noise images. Additionally\, a sample holder with eucentric tilt and rotation capabilities allows to tilt the sample into well-controlled channelling conditions.The technique can be used very similar to TEM\, however with the serious advantage that a bulk sample is observed and not a thin foil. This enables observation of much larger samples\, simplifies sample preparation\, and it facilitates in-situ experiments like deformation\, heating\, or gas reaction observations.In the presentation the basic principles of the technique are explained and illustrated. We then show examples from studies on hydrogen-embrittlement of high-strength steels\, creep of superalloys\, precipitation at dislocations in aluminium alloys and observation of dislocations in ductile magnesium alloys. \n\n\n\n \n\n\n\nThis session was chaired by Erik Offerman\, Delft University of Technology\, the Netherlands.
URL:https://mmelo.eu/event/online-lecture-by-dr-stefan-zaefferer/
CATEGORIES:Online Lectures
ATTACH;FMTTYPE=image/png:https://mmelo.eu/wp-content/uploads/2025/06/Stefan-Zaefferer-100x13396dpi.png
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Brussels:20250417T150000
DTEND;TZID=Europe/Brussels:20250417T160000
DTSTAMP:20260623T211502
CREATED:20250416T134307Z
LAST-MODIFIED:20250620T125821Z
UID:1673-1744902000-1744905600@mmelo.eu
SUMMARY:Online Lecture by Marcel H.F. Sluiter & Kai Liu
DESCRIPTION:Anisotropy\, Heterogeneity and Stress: Grain Boundaries under Tension and Elastic and Plastic behaviour of Pearlite\n\n\n\n\n\n\n\n\n\nDepartment of Materials Science & EngineeringDelft University of Technology\, Delft\, The Netherlands \n\n\n\n\n\n\n\nTitle: Anisotropy\, Heterogeneity and Stress: Grain Boundaries under Tension and Elastic and Plastic behaviour of Pearlite. \n\n\n\nAbstract: A material is most likely to fail where it is loaded most heavily. On the macroscopic scale\, when designing with materials\, often great care is taken to minimize concentration of stress. On the microscale such stress concentrations occur also. But perhaps surprisingly\, have received less attention. The microstructure provides various sources of local stress concentrations and failure initiation sites. A material under tension generally develops a stress difference across grain boundaries (GBs). On the scale of individual crystals but few materials are elastically isotropic. Therefore\, under load\, the crystals on either side of a GB have generally different compliances. As the two grains\, when loaded elastically\, remain fully connected at the boundary\, it means that the stress tensor differs in the two grains. Thus\, the stress tensor inside the material can differ substantially from the externally applied stress. Under linear elasticity the internal stress as function of the applied external stress has recently been analyzed in detail. In spite of its complexity some general results have been derived. E.g. for all cubic crystals the highest stress discontinuity occurs at (111)//(100) grain boundaries\, with little dependence of on rotation around the normal of the GB plane.Another case where stress can much deviate from the average\, is where dissimilar phases are intricately joined\, such as in pearlite. Pearlite is long been used to produce wires that approach the theoretical strength limit. The behavior of pearlite with the Bagaryatskii orientation relationship under uniaxial stress within the lamellar plane has been explored both in the elastic and plastic regime. Within the lamellar plane a range of uniaxial loading directions has been considered. Schmid factors\, interfacial dislocations\, and crystallographic aspects all together cause a variety of deformation behaviors as function of the in-plane loading direction. For many directions deformation is initiated at interfacial dislocations at the ferrite side. Surprisingly\, it is found that loading directions exist where slip begins in the cementite layers rather than in the ferrite layers. The extended range or work hardening and other features of pearlite are explored through atomistic modelling. These observations might contribute to the design of other high-performance materials with lamellar microstructures deriving from eutectic or eutectoid transformations. \n\n\n\n \n\n\n\nThis session was chaired by prof. Leo Kestens (Ghent University)
URL:https://mmelo.eu/event/online-lecture-by-marcel-h-f-sluiter-kai-liu/
CATEGORIES:Online Lectures
ATTACH;FMTTYPE=image/png:https://mmelo.eu/wp-content/uploads/2025/04/Marcel-H.F.-Sluiter-Kai-Liu-100x13396dpi.png
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Brussels:20250320T113000
DTEND;TZID=Europe/Brussels:20250320T123000
DTSTAMP:20260623T211502
CREATED:20250401T142904Z
LAST-MODIFIED:20250401T142905Z
UID:1680-1742470200-1742473800@mmelo.eu
SUMMARY:Online Lecture by prof. Anthony D. Rollett
DESCRIPTION:Synchrotron x-ray Diffraction\, Visualisation & Microscopy Combined with Simulation and Machine Learning\n\n\n\n\n\n\n\n\n\nUniversity Professor and US Steel Professor of Metallurgical Engineering & Materials ScienceDepartment of Materials Science & EngineeringCarnegie Mellon University\, Pittsburgh \n\n\n\n\n\n\n\nTitle: Synchrotron x-ray Diffraction\, Visualisation & Microscopy Combined with Simulation and Machine Learning. \n\n\n\nAbstract: Additive manufacturing (AM)\, aka 3D printing is a relatively new technology that has given rise to the “maker culture” and an intense interest in design. That has carried over into metals AM\, which has jumped almost immediately into manufacturing of actual parts in a variety of alloys. In doing so it has liberated thinking about part design albeit within certain constraints and complex components have been deployed that were previously inaccessible.  One example is described of the co-design of HX against printing constraints\, alongside evolution in alloy choice. Another example is the development of a digital twin for processing-microstructure-fatigue in 3D printed metals. These practical applications expose the issue that the reliability of parts that must carry load depends on the internal micro-structure\, acutely so in fatigue loading. This motivates detailed study of all aspects of materials microstructure ranging from precipitation to defects to strain\, all of which is ideally suited to the use of intense sources of high energy x-rays as only advanced light sources can deliver. High speed\, high resolution diffraction microscopy in stainless steel\, alloy 718 and Ti-6Al-4V reveals unexpected solidification and precipitation sequences. High energy diffraction microscopy (HEDM) reveals the highly strained nature of printed metals and how microstructure and internal strain state evolves during subsequent annealing and/or annealing. High speed radiography reveals even more crucial details of how laser light generates vapor cavities that can deposit voids past a critical instability point. “Hot” cracking has been imaged as it happens during the solidification process\, which offers the possibility finding printing recipes for alloys previously considered off-limits to 3D printing. Computed tomography (CT) has revealed the presence of porosity in all additively manufactured metals examined to date and confirmed that appropriate process control can limit it. CT has also provided data on surface condition which directly affects fatigue performance.  Permeating all these activities is direct simulation and machine learning as an invaluable aid to the researcher. Pores\, for example\, need to be understood in terms of their size\, location\, shape and the stress+strain concentrations that occur under load.  Direct simulation with elasto-viscoplastic micro-mechanics with crystal plasticity can be done with good efficiency but need to re-formulated as a reduced-order model for efficient use in workflows that can efficiently evaluate process variations in a digital twin. \n\n\n\n \n\n\n\nThis session was chaired by Prof. Leo Kestens (UGent – TU Delft)
URL:https://mmelo.eu/event/online-lecture-by-prof-anthony-d-rollett/
CATEGORIES:Online Lectures
ATTACH;FMTTYPE=image/png:https://mmelo.eu/wp-content/uploads/2025/04/Anthony-Rollett-100x13396dpi.png
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Brussels:20250220T140000
DTEND;TZID=Europe/Brussels:20250220T150000
DTSTAMP:20260623T211502
CREATED:20250130T123211Z
LAST-MODIFIED:20250221T152306Z
UID:1663-1740060000-1740063600@mmelo.eu
SUMMARY:Online Lecture by prof. Goro Miyamoto
DESCRIPTION:Orientation Relationship\, Variant Selection\, and Their Effects on Phase Transformations in Steel\n\n\n\n\n\n\n\n\n\nInstitute for Materials ResearchTohoku UniversityJapan \n\n\n\n\n\n\n\nTitle: Orientation Relationship\, Variant Selection\, and Their Effects on Phase Transformations in Steel. \n\n\n\nAbstract: The crystallography of interphase boundaries plays a crucial role in both displacive and reconstructive transformations. However\, analyzing the orientation relationship of the fcc-austenite to bcc transformation in most steels has not been straightforward due to the absence of the austenite phase at room temperature\, making direct measurement challenging. The reconstruction of the austenite matrix enables a quantitative analysis of orientation relationships and variant selection. In this presentation\, the fundamentals of orientation relationships and variant selection will be explained. Additionally\, I will present examples of crystallographic features in some transformations and discuss their effects on interface mobility\, partitioning\, segregation\, and variant selection during nucleation. \n\n\n\n \n\n\n\nThis session was chaired by dr. Erik Offerman (TU Delft)
URL:https://mmelo.eu/event/online-lecture-by-prof-goro-miyamoto/
CATEGORIES:Online Lectures
ATTACH;FMTTYPE=image/jpeg:https://mmelo.eu/wp-content/uploads/2025/01/Goro-Miyamoto-100x13396dpi.jpg
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Brussels:20241219T150000
DTEND;TZID=Europe/Brussels:20241219T160000
DTSTAMP:20260623T211502
CREATED:20241217T230757Z
LAST-MODIFIED:20241220T000052Z
UID:1653-1734620400-1734624000@mmelo.eu
SUMMARY:Online Lecture by prof. Francisca G. Caballero
DESCRIPTION:What sets bainite and martensite apart and what makes them similar?\n\n\n\n\n\n\n\n\n\nNational Centre for Metallurgical Research (CENIM-CSIC)Materalia Group – Physical Metallurgy DeptMadrid\, Spain \n\n\n\n\n\n\n\nTitle: What sets bainite and martensite apart and what makes them similar ? \n\n\n\nAbstract: This study investigates the differences and similarities between bainitic and martensitic structures obtained by isothermal heat treatments such as austempering\, quench and partitioning (Q&P)\, and quench and tempering (Q&T) using a variety of techniques such as X-ray diffraction\, electron backscatter diffraction\, scanning and transmission electron microscopy\, and atom probe tomography.The results show that by varying the isothermal holding temperature\, identical austenite concentration may be obtained in ferritic structures that resemble laths. Nonetheless\, some diversity in hardness is noted\, which is compatible with variations in the crystallographic size distribution of ferritic grains and variations in the precipitation state as shown by the structure’s nanoscale analysis. \n\n\n\n \n\n\n\nThis session was chaired by prof. Annika Borgenstam (KTH Stockholm)
URL:https://mmelo.eu/event/online-lecture-by-prof-francisca-g-caballero/
CATEGORIES:Online Lectures
ATTACH;FMTTYPE=image/png:https://mmelo.eu/wp-content/uploads/2024/11/Francisca-G.-Caballero-100x13396dpi.png
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Brussels:20241121T150000
DTEND;TZID=Europe/Brussels:20241121T160000
DTSTAMP:20260623T211502
CREATED:20241105T135632Z
LAST-MODIFIED:20241205T224310Z
UID:1645-1732201200-1732204800@mmelo.eu
SUMMARY:Online Lecture by prof. Lionel Germain
DESCRIPTION:Deep Learning applied to microstructure analysis. Performances and limitations.\n\n\n\n\n\n\n\n\n\nLaboratoire d’Étude des Microstructures et de Mécanique des MatériauxUniversité de Lorraine – Site Technopole\, Metz\, France \n\n\n\n\n\n\n\nTitle: Deep Learning applied to microstructure analysis. Performances and limitations. \n\n\n\nAbstract: Deep learning has revolutionized image processing in many applications (computer vision\, image generation …). Applied to microstructure analyses\, it has also shown very good performances in many different tasks. In particular\, convolutional neural networks (CNNs) have enabled significant advancements in tasks like classification\, segmentation\, and feature extraction from microstructural images. Often\, these methods have demonstrated state of the art performances (when not superior) in identifying and quantifying microstructural features compared to traditional techniques.In this presentation\, the working principles of CNNs will be shown. Several examples of applications will be presented and their performances and limitation will be discussed. The examples addressed both optical microstructures\, SEM micrographs and EBSD data. The specificity of each example will be discussed. \n\n\n\n \n\n\n\nThis session will be chaired by prof. Leo Kestens (UGent – TU Delft)
URL:https://mmelo.eu/event/online-lecture-by-prof-lionel-germain/
CATEGORIES:Online Lectures
ATTACH;FMTTYPE=image/jpeg:https://mmelo.eu/wp-content/uploads/2024/11/Lionel-Germain-100x13396dpi.jpg
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Brussels:20241017T150000
DTEND;TZID=Europe/Brussels:20241017T160000
DTSTAMP:20260623T211502
CREATED:20241011T154508Z
LAST-MODIFIED:20241105T135706Z
UID:1636-1729177200-1729180800@mmelo.eu
SUMMARY:Online Lecture by prof. Roumen Petrov
DESCRIPTION:Microstructure and texture formation of Advanced High Strength Steels produced via non-conventional technologies\n\n\n\n\n\n\n\n\n\nGhent University\, Metals Science and Technology\, Ghent\, Belgium.Delft University of Technology\, Department of Materials Science & Engineering\, Delft\, The Netherlands. \n\n\n\n\n\n\n\nTitle: Microstructure and texture formation of Advanced High Strength Steels produced via non-conventional technologies \n\n\n\nAbstract: The development of new processing routes in the steel industry is motivated by the global regulations that emerged\, regarding the reduction of CO2 emissions. Thus\, recent research and technological advances are oriented not only toward the development of new grades of AHSS that balance good mechanical properties but also toward a cost-effective and energy-saving manufacturing technique. Current “conventional“ technologies for the thermal treatment of flat steel products (sheets and strips) on continuous annealing lines use hydrocarbon gases and /or electro-resistive heating that are not very effective and potentially polluting. The present research focuses on the evaluation of the microstructure\, texture\, and mechanical properties of advanced high-strength steel (AHSS) that was subjected to multiple intercritical annealing thermal cycles with conventional and ultra-high heating rates\, intending to gain insight into the grain refinement effects and its influence on the mechanical properties. Two thermal pathways were designed and performed on an initial cold-rolled low-carbon steel\, i.e.\, triple annealing cycles combined with ultra-fast annealing (TA&UFA)\, and a single ultra-fast annealing cycle (UFA). All experiments were carried out in a dilatometer with induction heating. The microstructure\, texture\, and mechanical properties (hardness and tensile properties) of the treated steel samples were evaluated. It was found that both multiple thermal cycling and UFH can produce steels with finer microstructure and higher hardness than the conventional one-step heat treatment technology. However\, unexpected effects of texture weakening were observed in the steels after thermal cycling. Finally\, results and conclusions are obtained regarding the effectiveness of the studied thermal routes as grain refinement techniques.Keywords: advanced high-strength steel\, ultra-fast annealing\, thermal cycling\, microstructure\, grain refinement\, texture \n\n\n\n \n\n\n\nThis session was chaired by prof. Leo Kestens (UGent – TU Delft)
URL:https://mmelo.eu/event/online-lecture-by-prof-roumen-petrov/
CATEGORIES:Online Lectures
ATTACH;FMTTYPE=image/jpeg:https://mmelo.eu/wp-content/uploads/2024/10/Roumen-Petrov-100x13396dpi.jpg
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Brussels:20240919T150000
DTEND;TZID=Europe/Brussels:20240919T160000
DTSTAMP:20260623T211502
CREATED:20240913T153708Z
LAST-MODIFIED:20240923T190610Z
UID:1599-1726758000-1726761600@mmelo.eu
SUMMARY:Online Lecture by dr. Erik Offerman
DESCRIPTION:Some attempts to better understand the phenomenon of solid-state nucleation in steel\n\n\n\n\n\n\n\n\n\nDelft University of Technology\, Department of Materials Science & Engineering\, Delft\, The Netherlands \n\n\n\n\n\n\n\nTitle: Some attempts to better understand the phenomenon of solid-state nucleation in steel \n\n\n\nAbstract: Nucleation in the solid-state is an important phenomenon in the science and engineering of metals. The nucleation stage determines to large extend the evolution of the metallic microstructure during solid-state phase transformations\, recrystallization and precipitation. In turn\, the final microstructure has a large influence on the mechanical properties of metals\, which makes nucleation of technological importance. Despite many scientific investigations\, the phenomenon of solid-state nucleation is not yet fully understood. It remains challenging to predict the nucleation rate during thermo-mechanical processing of steel and to experimentally capture the nucleation phenomenon in the solid-state. This lecture presents experimental observations of ferrite\, austenite and precipitate formation in steel with the aim to better understand the nucleation phenomenon in the solid-state. Some thoughts on the role of special crystallographic orientation relationships between parent and product phases\, deformation\, composition and temperature during nucleation in the solid-state will be discussed. \n\n\n\n \n\n\n\nThis session will be chaired by prof. Roumen Petrov (Ghent University\, Belgium).
URL:https://mmelo.eu/event/online-lecture-by-dr-erik-offerman/
CATEGORIES:Online Lectures
ATTACH;FMTTYPE=image/png:https://mmelo.eu/wp-content/uploads/2024/09/Erik-Offerman-100x13396dpi.png
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Brussels:20240620T170000
DTEND;TZID=Europe/Brussels:20240620T183000
DTSTAMP:20260623T211502
CREATED:20240627T175534Z
LAST-MODIFIED:20240627T180422Z
UID:1615-1718902800-1718908200@mmelo.eu
SUMMARY:Online Lecture by prof. Matthias Militzer
DESCRIPTION:Advances in Microstructure Engineering of Steels\n\n\n\n\n\n\n\n\n\nUniversity of British Columbia\, Vancouver\, BC\, Canada \n\n\n\n\n\n\n\nTitle: Advances in Microstructure Engineering of Steels \n\n\n\nAbstract: The steel industry is engaged in a continuous development of high-performance steels and innovative processing strategies to meet the demands of sustainable growth in the energy\, transportation and construction sectors. Since the 1970’s thermomechanically-controlled processing (TMCP) of steels has motivated to develop microstructure-based process model and computational modelling has remained an important aspect to design microstructures and resulting properties of advanced high-performance steels. Initially semi-empirical state variable models were commonly employed but the tremendous development of computational power and resources has enabled to incorporate advanced computational materials science tools at different length and time scales into process modelling. Multi-scale approaches combine atomistic scale simulations with meso-scale modelling on the microstructure length scale to establish predictive tools for the industrially relevant macro-scale. Austenite grain growth and decomposition are key aspects of microstructure evolution and thus the resulting properties of steels. For example\, alloying elements and other solutes affect migration rates of grain boundaries and the austenite-ferrite interface. Thus\, an interface-based alloy design approach has recently been proposed where phase-field modelling is informed by atomistic scale simulations using density functional theory (DFT). Utilizing binding energy data concluded from DFT a friction pressure approach has been adopted to account for solute drag and/or particle pinning. Alloy trend predictions can be made in this way and have been verified with experimental data including in-situ measurements of grain growth using laser ultrasonics and confocal scanning laser microscopy. The extension of this methodology will be discussed for the design of new steels where residuals from scrap-based steelmaking are expected to be of relevance. The strengths and limitations of the proposed modelling approach will be critically reviewed. \n\n\n\n \n\n\n\nThis session was chaired by prof. dr. Erik Offerman (TUD).
URL:https://mmelo.eu/event/online-lecture-by-prof-matthias-militzer/
CATEGORIES:Online Lectures
ATTACH;FMTTYPE=image/png:https://mmelo.eu/wp-content/uploads/2024/06/Matthias-Militzer-100x13396dpi.png
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Brussels:20240516T153000
DTEND;TZID=Europe/Brussels:20240516T170000
DTSTAMP:20260623T211502
CREATED:20240515T101646Z
LAST-MODIFIED:20240528T140111Z
UID:1582-1715873400-1715878800@mmelo.eu
SUMMARY:Online Lecture by prof. Jilt Sietsma
DESCRIPTION:Quantifying dislocation structures\, simply from tensile tests\n\n\n\n\n\n\n\n\n\nMaterials Science and Engineering\, TU Delft\, The Netherlands \n\n\n\n\n\n\n\nTitle: Quantifying dislocation structures\, simply from tensile tests \n\n\n\nAbstract: Since it is governing to a large extent the mechanical behaviour of metals\, the dislocation structure is crucial in studying and applying this important class of materials. Although the theoretical aspects of dislocations have been developed through decades and are relatively well-known\, experimental observation and quantification of dislocation structures is problematic. This is a strong drawback when aiming to optimise mechanical properties by tailoring the dislocation structure. Transmission Electron Microscopy can make dislocations visible (but with severe limitations\, as will be explained in the lecture)\, X-ray diffraction can to a certain extent quantify the dislocation density (but not more than that and with limited accuracy) and numerical simulations at the atomic or microscale can provide insight into dislocation behaviour. These are all valuable tools\, but limited when regarding the complexity of the dislocation structure.On the other hand\, it is well-known that the elastic part (i.e. before yielding) of a tensile curve is not as linear as text books often claim. The deviations from the Young’s modulus are caused by (partly reversible) motion of dislocations at stresses even well below the yield stress. This means that these deviations contain information on the dislocation structure. In the presentation it is shown how this information can be quantified\, yielding values for the dislocation density and the average length of dislocation segments with an appreciable accuracy\, provided that the pre-yield part of the tensile curve is measured accurately. This method does not reveal the full complexity of the dislocation structure\, but it is a valuable addition to the experimental tools that we have to quantify the dislocation structure. \n\n\n\n \n\n\n\nThis session was chaired by prof. Dr. Erik Offerman (TU Delft).
URL:https://mmelo.eu/event/online-lecture-by-prof-jilt-sietsma/
CATEGORIES:Online Lectures
ATTACH;FMTTYPE=image/jpeg:https://mmelo.eu/wp-content/uploads/2024/05/Jilt-Sietsma-100x13396dpi.jpg
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Brussels:20240418T150000
DTEND;TZID=Europe/Brussels:20240418T163000
DTSTAMP:20260623T211502
CREATED:20240426T153944Z
LAST-MODIFIED:20240426T182239Z
UID:1573-1713452400-1713457800@mmelo.eu
SUMMARY:Online Lecture by prof. Anne-Marie Habraken
DESCRIPTION:A creep survey: from creep mechanism to macroscopic and microscopic models\n\n\n\n\n\n\n\n\n\nLeader of MSM team (Materials and Solid Mechanics) at ULiege\, Belgium (Dpt of Architecture\, Geology\, Environment and Constructions) \n\n\n\n\n\n\n\nTitle: A creep survey: from creep mechanism to macroscopic and microscopic models \n\n\n\nAbstract: At high temperature\, metallic material creep is difficult to avoid. The understanding of the creep mechanisms helps metallurgists to design optimal alloy compositions and the prediction of a component life is a key input to manage safe maintenance and to define operational cost of any production line (solar plant parts\, heat exchanger\, any turbine parts loaded at high temperature…). This lecture will review the creep mechanisms usually present in materials such as Incoloy 718\, Fe-Ni-Cr Incoloy® 800H alloy\, A230 alloy or martensitic 9–12% Cr steels. Macroscopic constitutive laws used within FE simulations\, quantitative physical standalone models and multiscale ones will be presented. The identification methodology will be shortly addressed. Ongoing AID4Greenest European project goals dealing with 30CrMoNiV5-11 steel will be presented. \n\n\n\n \n\n\n\nThis session was chaired by prof. Leo Kestens (Ghent University).
URL:https://mmelo.eu/event/online-lecture-by-prof-anne-marie-habraken/
CATEGORIES:Online Lectures
ATTACH;FMTTYPE=image/jpeg:https://mmelo.eu/wp-content/uploads/2024/04/Anne-Marie-Habraken-133x10096dpi.jpg
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Brussels:20240321T150000
DTEND;TZID=Europe/Brussels:20240321T163000
DTSTAMP:20260623T211502
CREATED:20240221T154313Z
LAST-MODIFIED:20240426T182428Z
UID:1563-1711033200-1711038600@mmelo.eu
SUMMARY:Online Lecture by prof. Tadashi Furuhara
DESCRIPTION:Strengthening of low-alloy steels by controlling nanoscale precipitation\n\n\n\n\n\n\n\n\n\nInstitute for Materials Research\, Tohoku University\, Japan \n\n\n\n\n\n\n\nTitle: Strengthening of low-alloy steels by controlling nanoscale precipitation \n\n\n\nAbstract: Precipitation strengthening is one of the most important mechanisms to achieve high strength of metallic materials. In advanced high strength sheet steels\, interphase precipitation of alloy carbide during ferrite transformation is utilized with microalloying of strong carbide forming elements. For surface hardening of low-alloy steels for machinery by nitriding to obtain good wear resistance and fatigue-bearing properties\, fine dispersion of alloy nitride is essential.In this lecture\, fundamental principles for controlling alloy carbide/nitride precipitation are discussed. Particular\, the importance of strongly attractive elemental interactions between interstitial (i) and substitutional (s) alloying elements\, which causes metastable atomic clustering governed by ‘spinodal ordering’ as a precursor is emphasized for achieving finer particle dispersion of stable carbide/nitride phase. This leads to a novel concept of ‘interstitial sublattice engineering’ for designing high strength steels. \n\n\n\n \n\n\n\nThis session was chaired by prof. Dr. Annika Borgenstam.
URL:https://mmelo.eu/event/online-lecture-by-prof-tadashi-furuhara/
CATEGORIES:Online Lectures
ATTACH;FMTTYPE=image/jpeg:https://mmelo.eu/wp-content/uploads/2024/02/Tadashi-Furuhara-100x13396dpi.jpg
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Brussels:20240215T150000
DTEND;TZID=Europe/Brussels:20240215T163000
DTSTAMP:20260623T211502
CREATED:20240202T143935Z
LAST-MODIFIED:20240311T122400Z
UID:1549-1708009200-1708014600@mmelo.eu
SUMMARY:Online Lecture by prof. Hatem Zurob
DESCRIPTION:Bainite Revisited- A diffusional-displacive model for the lengthening of bainitic ferrite\n\n\n\n\n\n\n\n\n\nDepartment of Materials Science & Engineering\, McMaster University\, Canada \n\n\n\n\n\n\n\nTitle: Bainite Revisited- A diffusional-displacive model for the lengthening of bainitic ferrite \n\n\n\nAbstract: The formation of bainite is a key part of the microstructure evolution in many important steels.  We’ll start by reviewing the Zener-Hillert model for bainite growth.We’ll then introduce the displacive nature of the transformation by taking into account the movement of disconnections at the growing interface.  The “barrier” is discussed in terms of the interaction of the disconnections with obstacles such as solute atoms.  The effect of deformation on the lengthening of bainite will also be discussed.Two cases will be distinguished. In the first scenario the bainitic ferrite plates grow into pre-deformed austenite\, while in the second case the plates grow while the sample is being deformed. \n\n\n\n \n\n\n\nThis session was chaired by prof. Erik Offerman (TU Delft\, the Netherlands).
URL:https://mmelo.eu/event/online-lecture-by-prof-hatem-zurob/
CATEGORIES:Online Lectures
ATTACH;FMTTYPE=image/png:https://mmelo.eu/wp-content/uploads/2024/02/Hatem-Zurob-100x13396dpi.png
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Brussels:20231214T150000
DTEND;TZID=Europe/Brussels:20231214T163000
DTSTAMP:20260623T211502
CREATED:20231128T145008Z
LAST-MODIFIED:20240118T203939Z
UID:1533-1702566000-1702571400@mmelo.eu
SUMMARY:Online Lecture by prof. Cyril Cayron
DESCRIPTION:A partial overview on the crystallography of martensitic transformations and twinning\n\n\n\n\n\n\n\n\n\nLaboratory of Thermomechanical Metallurgy (LMTM)\, PX Group Chair\, Ecole Polytechnique Fédérale de Lausanne (EPFL)\, Switzerland \n\n\n\n\n\n\n\nTitle: A partial overview on the crystallography of martensitic transformations and twinning \n\n\n\nAbstract: Deformation twinning and martensitic transformations are important plastic deformation mechanisms in shape memory alloys and in modern steels and titanium alloys. Both are classified a “shear” mechanisms; the parent/daughter interface is the shear plane. This simple shear assumption\, quite easy to accept for type I deformation twins\, is however impossible from a crystallographic point of view for the type II twins and for most of martensites. Metallurgists solved this issue for type II twins by assuming that the interface plane is irrational\, and for martensite by assuming that the martensite lath or plate is a composite made of A) two variants\, or B) one variant and regular sets of dislocations forming a Lattice Invariant Strain (LIS). This is the basis of the Phenomenological Theory of Martensite Crystallography (PTMC) proposed in the 1950’s. In the PTMC-A\, the variants in the pairs are linked by specific relationships called “transformation twins” that are outputs of the calculations. In the PTMC-B\, the LIS slip systems are inputs arbitrarily chosen. The knowledge of the lattice parameters (metrics) of the parent and daughter phases is required for both A and B versions. The PTMC explains many crystallographic features of martensite. However\, it remains phenomenological\, not completely predictive\, mesmerized by polar decompositions\, quite heavy in its calculations\, clumsy in its way to treat the symmetries\, and mute on the atomic paths. In this presentation\, a simple alternative approach will be proposed in which the interface plane is not necessarily fully invariant. Thanks to this additional degree of freedom\, the atomistic paths\, variant selection and texture changes can be calculated and predicted. The habit planes and the variants favored by external stresses are predicted uniquely from the distortion matrix. Since this matrix is not a simple shear or an Invariant Plane Strain (IPS)\, the Schmid or Patel-Cohen factors classically used in the PTMC had to be replaced by a more general parameter\, the “Interaction Work” (IW). The transformation twins and their junction planes are determined without solving any equation\, from a careful consideration of the symmetries and by using the inter-correspondences between the variants. It appears clearly that shear plane for the type I twins and the shear direction for the type II twins are generic\, i.e. they do not depend on the metrics of the parent and daughter phases. Another type of twin called “weak twin” was introduced to describe the transformation twins in which the pairs of variants not linked by a two-fold symmetry. Some odd deformation twins reported in recent literature are also probably weak twins. During this presentation\, the theory will be compared to EBSD experiments on martensite in steels and in NiTi shape memory alloys\, and on deformation twins in pure magnesium. The talk will end by the description of an experiment in a AuCu alloy showing that the order-disorder phase transformation is both diffusive and displacive\, and that the coupling between the two mechanisms creates a “magic” effect called TADA for Thermally Activated Distortion with Amplification. \n\n\n\n \n\n\n\nThis session was chaired by prof. Erik Offerman (TU Delft).
URL:https://mmelo.eu/event/online-lecture-by-prof-cyril-cayron/
CATEGORIES:Online Lectures
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BEGIN:VEVENT
DTSTART;TZID=Europe/Brussels:20231116T150000
DTEND;TZID=Europe/Brussels:20231116T163000
DTSTAMP:20260623T211502
CREATED:20231128T115327Z
LAST-MODIFIED:20231128T121230Z
UID:1523-1700146800-1700152200@mmelo.eu
SUMMARY:Online Lecture by prof. Susanne Norgren
DESCRIPTION:Hardmaterial – from microstructure to applications\n\n\n\n\n\n\n\n\n\nSpeaker: prof. Susanne Norgren\,   \n\n\n\nSandvik Group Expert Materials Design&Adjunct Professor\, Department of Mechanical Engineering\, Division of Production and Materials Engineering Lund University\, Sweden \n\n\n\nFellow of the Royal Swedish Academy of Engineering\, currently Chair division V of Materials & Mining.Co-Chair of the European Powder Metallurgy Institute\, powered by EPMA. \n\n\n\n\n\n\n\nTitle: Hardmaterial – from microstructure to applications \n\n\n\nAbstract: Hardmetals\, or Cemented carbides\, are a composite material consisting of hard tungsten carbide grains embedded  in a metal matrix usually cobalt. The grain size of the tungsten carbide grains vary from 200nm in submicron cemented carbides to 15 micron in very coarse grain cemented carbides. The grain size is carefully controlled during manufacturing and the selection of final grain size is determined by the needs of the application.  In this system the grains are facetted and to understand the mechanisms of grain growth and how to control it during sintering is of vital importance. In this presentation controlling and modelling of grain growth will be discussed\, as well as still open questions.  Another important parameter in the microstructure\, are the phase-interphases and the tungsten carbide/tungsten carbide grain boundaries. Studies of grain and phase boundaries\, using atom probe tomography and creation of interfacial phase diagrams to understand grain growth and grain boundary chemistry and in the end impact on material properties will be discussed. \n\n\n\n \n\n\n\nThis session was chaired by prof. Joakim Odqvist (KTH Royal Institute of Technology\, Sweden).
URL:https://mmelo.eu/event/online-lecture-by-prof-susanne-norgren/
CATEGORIES:Online Lectures
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BEGIN:VEVENT
DTSTART;TZID=Europe/Brussels:20231019T110000
DTEND;TZID=Europe/Brussels:20231019T123000
DTSTAMP:20260623T211502
CREATED:20231010T142010Z
LAST-MODIFIED:20231019T181804Z
UID:1512-1697713200-1697718600@mmelo.eu
SUMMARY:Online Lecture by prof. Klaus-Dieter Liss
DESCRIPTION:Metals under microstructural evolution –followed in-situ by synchrotron and neutron radiation\n\n\n\n\n\n\n\n\n\nSpeaker: prof. Klaus-Dieter Liss\,  School of Mechanical\, Materials\, Mechatronic and Biomedical Engineering\, University of Wollongong\, NSW 2522\, Australia. \n\n\n\n\n\n\n\nTitle: Metals under microstructural evolution – followed in-situ by synchrotron and neutron radiation \n\n\n\nAbstract: In-situ neutron and synchrotron X-ray diffraction deliver unique insights into the microstructural evolution of metals under exotic conditions\, both in-situ and in real-time. Comprehensive exploitation of scattering signals includes multi-dimensional reciprocal-space studies on a number of individual grains and local information. For each constituting phase\, their statistics and temporal behavior reveal information about grain growth or refinement\, subgrain formation\, static and dynamic recovery and recrystallization\, slip systems\, and twinning. Grain orientation correlations can be revealed\, and lattice strain gives complementary insight into the transformation and reaction processes upon heating ramps or other in-situ conditions.Here\, I like to focus on microstructural rearrangements in reciprocal space\, such as recrystallization and grain growth. In particular\, white-beam Laue diffraction reveals the reorientation processes underlying abnormal grain growth in magnesium alloy\, which has been predicted to be erratic and without any practical technique to be observe. In the scenario\, some grain boundaries are spontaneously activated\, opening diffusion channels for grain rotation until coalescence. During its reorientation\, however\, the driving forces can take over from many neighboring grains\, such that its reorientation is indeed erratic. Once coalesced into a larger grain\, their boundaries remain activated\, giving rise to further growth.The findings present the missing puzzle stone of the initiation of abnormal grain growth. \n\n\n\n \n\n\n\nThis session was chaired by dr. S.E. Erik Offerman.
URL:https://mmelo.eu/event/online-lecture-by-prof-klaus-dieter-liss/
CATEGORIES:Online Lectures
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BEGIN:VEVENT
DTSTART;TZID=Europe/Brussels:20230921T150000
DTEND;TZID=Europe/Brussels:20230921T163000
DTSTAMP:20260623T211502
CREATED:20230912T160656Z
LAST-MODIFIED:20230923T105737Z
UID:1482-1695308400-1695313800@mmelo.eu
SUMMARY:Online Lecture by prof. Nathalie Bozzolo
DESCRIPTION:Recrystallization phenomena in Nickel based superalloy forgings\n\n\n\n\n\n\n\n\n\nSpeaker: prof. Nathalie Bozzolo\,  Centre de Mise en Forme de Matériaux \, CEMEF – MINES ParisTech (France). \n\n\n\n\n\n\n\nTitle: Recrystallization phenomena in Nickel based superalloy forgings \n\n\n\nAbstract: The focus of the presentation will be placed on polycrystalline Nickel based superalloys used for aircraft engine turbine disks\, and more precisely on recrystallization phenomena taking place while forging those pieces. Recrystallization is a crucial issue in this field since the forged components are submitted to strict microstructure requirements to sustain the severe and complex solicitations to which the disks will be submitted all along their in-service life. The most usual phenomenon controlling the final grain size while forging nickel based superalloys is known to be dynamic recrystallization proceeding discontinuously through necklace nucleation. Post-dynamic evolutions may nevertheless also be of utmost importance in the control of the final microstructure in a large forging after cooling down to room temperature. In addition\, particular attention must be paid to second phase particles which are supposed to limit grain growth by the so-called Smith-Zener interactions. The design of lab experiments to accurately describe the kinetics of such microstructure evolutions and their dependence to the applied thermomechanical conditions will be discussed and the care to be taken in quantitative microstructure analyses will be emphasized also. Once the mechanisms are identified and their kinetics described\, they both can be simulated\, using either mean field models\, or advanced full field approaches when intrinsic heterogeneities must be considered. The presentation will provide a few examples of both experimental and numerical results\, which will also emphasize the interest of combining both approaches to better understand the material behavior through a realistic and intrinsically complex thermomechanical path representative for a typical industrial process. \n\n\n\n \n\n\n\nThis session was chaired by prof. Leo Kestens (Ghent University).
URL:https://mmelo.eu/event/online-lecture-by-prof-nathalie-bozzolo/
CATEGORIES:Online Lectures
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BEGIN:VEVENT
DTSTART;TZID=Europe/Brussels:20230615T150000
DTEND;TZID=Europe/Brussels:20230615T163000
DTSTAMP:20260623T211502
CREATED:20230703T122703Z
LAST-MODIFIED:20230703T125535Z
UID:1472-1686841200-1686846600@mmelo.eu
SUMMARY:Online Lecture by prof. Jurij Sidor
DESCRIPTION:Investigation of recrystallisation phenomena in metals by numerical approximations and experimental evidences\n\n\n\n\n\n\n\n\n\nSpeaker: prof. Jurij Sidor\,  Savaria Institute of Technology\, Faculty of Informatics\, Eötvös Loránd University. \n\n\n\n\n\n\n\nTitle: Investigation of recrystallisation phenomena in metals by numerical approximations and experimental evidence \n\n\n\nAbstract: To examine the phenomena involved in recrystallization\, detailed information on the evolution of deformed structure is required.This work analyses the development of dislocations during cold rolling and the kinetics of recrystallization. The relationship between the deformation and annealed states is studied by means of orientation imaging microscopy\, indentation techniques and numerical approaches.To quantify the dislocation density in the deformed material as well as the release of stored energy during annealing\, a range of methods such as microindentation\, X-ray diffraction line profile analysis and electron backscattering diffraction were employed.The experimental methods allowed both tracing the sub-structural aspect of microstructure evolution and assessing the kinetics of recrystallization. It was shown that the experimentally observed development of dislocation density can be reproduced by numerical approximation. Both experimental evidence and results of simulations related to substructure evolution enabled the determination of basic parameters (driving force of recrystallization\, nucleation rate\, etc.)\, which are necessary for the simulation of kinetics of recrystallization. \n\n\n\n \n\n\n\nThis session was chaired by prof. Leo Kestens (Ghent University).
URL:https://mmelo.eu/event/online-lecture-by-prof-jurij-sidor/
CATEGORIES:Online Lectures
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BEGIN:VEVENT
DTSTART;TZID=Europe/Brussels:20230511T150000
DTEND;TZID=Europe/Brussels:20230511T163000
DTSTAMP:20260623T211502
CREATED:20230505T182430Z
LAST-MODIFIED:20230703T125410Z
UID:1463-1683817200-1683822600@mmelo.eu
SUMMARY:Online Lecture by dr.rer.nat.habil. Dana Zöllner
DESCRIPTION:Modelling Grain Growth in Thin Films\n\n\n\n\n\n\n\n\n\nSpeaker: dr.rer.nat.habil. Dana Zöllner\,  Department of Civil and Mechanical Engineering\, Technical University of Denmark (Denmark). \n\n\n\n\n\n\n\nTitle: Modelling Grain Growth in Thin Films \n\n\n\nAbstract: Thin films undergoing grain growth are not only interesting from a purely scientific perspective\, but also important to understand from a technological point of view.The grain size influences many mechanical and optical properties of a material and\, hence\, changes in the size as they occur during grain growth influence not only the microstructure itself but also materials’ properties. Especially when it comes to thin films it is not only the polycrystalline grain structure and the properties of the grain boundaries that have to be taken into consideration\, but also the thickness of the film is rather important.It has been observed that when the grain size reaches the magnitude of the layer thickness\, the coarsening slows down and may even come to a full stop.This lecture will show a three-dimensional Monte Carlo Potts model approach for grain growth in thin films under a broad variety of conditions. Even under ideal coarsening conditions (normal grain growth) the three-dimensional nature of the digital thin film yields important insights that cannot be obtained from simplified 2D considerations. However\, the coarsening process gets more complicated when temperature gradients or surface effects such as grain boundary grooving are taken into account. \n\n\n\n \n\n\n\nThis session was chaired by prof. Leo Kestens (Ghent University). \n\n\n\nSTART ZOOM SESSION
URL:https://mmelo.eu/event/online-lecture-by-dr-rer-nat-habil-dana-zollner/
CATEGORIES:Online Lectures
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BEGIN:VEVENT
DTSTART;TZID=Europe/Brussels:20230420T150000
DTEND;TZID=Europe/Brussels:20230420T163000
DTSTAMP:20260623T211502
CREATED:20230414T140607Z
LAST-MODIFIED:20230703T125341Z
UID:1452-1682002800-1682008200@mmelo.eu
SUMMARY:Online Lecture by prof. Kees Bos
DESCRIPTION:Advanced through process modelling for microstructure evolution and mechanical properties in steel strip\n\n\n\n\n\n\n\n\n\nSpeaker: prof. Kees Bos\,  Tata Steel / Delft University of Technology (The Netherlands). \n\n\n\n\n\n\n\nTitle: Advanced through process modelling for microstructure evolution and mechanical properties in steel strip \n\n\n\nAbstract: Achieving optimal control over mechanical properties during low-carbon steel strip processing requires an accurate understanding of the relationship between process parameters and resulting properties. Microstructure evolution is a critical aspect of this connection\, influenced by various interdependent processes such as work hardening\, precipitation\, recrystallisation\, and phase transformations. Traditional mean field phenomenological models struggle to capture the complexity of modern steel grades like advanced high strength steels\, which are higher alloyed and exhibit slower recrystallisation and phase transformation rates. These reduced rates often result in partial transformations\, potentially leading to increased microstructure variations if not properly controlled. The increased complexity necessitates more sophisticated modelling approaches. The Digitally Enhanced New Steel (DENS) product development program has brought together over fifteen PhD and post-doc researchers\, from four different universities/research institutes\, to integrate and enhance existing full field models into a comprehensive 3D full field physical through-process model. This model encompasses not only microstructure evolution but also the relationships between microstructure and mechanical properties. This model is designed to accurately represent all relevant processes for contemporary low-carbon steel grades. In this presentation\, we will introduce the advanced through-process model\, discuss its strengths\, and identify areas where further refinement is needed to ensure optimal control over the mechanical properties of steel strips during processing and new product development. \n\n\n\n \n\n\n\nThis session was chaired by prof. Erik Offerman (Delft University of Technology\, The Netherlands).
URL:https://mmelo.eu/event/online-lecture-by-prof-kees-bos/
CATEGORIES:Online Lectures
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BEGIN:VEVENT
DTSTART;TZID=Europe/Brussels:20230316T150000
DTEND;TZID=Europe/Brussels:20230316T163000
DTSTAMP:20260623T211502
CREATED:20230313T122436Z
LAST-MODIFIED:20230703T125306Z
UID:1434-1678978800-1678984200@mmelo.eu
SUMMARY:Online Lecture by prof. Helena Zapolsky
DESCRIPTION:Atomistic modelling of phase transformation at large time and length scales: atomistic phase field approach\n\n\n\n\n\n\n\n\n\nSpeaker: prof. Helena Zapolsky\,  University of Rouen (France). \n\n\n\n\n\n\n\nTitle: Atomistic modelling of phase transformation at large time and length scales: atomistic phase field approach \n\n\n\nAbstract: In recent years\, significant progress has been made by using molecular dynamic and Monte Carlo modelling to study the physical properties of materials at atomic level.At the same time\, recent advances in computational methodologies and massively parallel computers have made it possible to carry out the simulations containing several million of atoms. However\, all these advances are not yet well suited to study slowly evolving systems with the typical diffusion time scale. Recently\, the new approach\, called “Quasi-particles Approach”\, based on the Atomic Density Function theory\, has been proposed to study the microstructural evolution in different types of materials at diffusion time scale keeping the atomic scale resolution.   In this lecture\, I will go back to the basics of this approach\, introducing the principal equations and main assumptions.Then\, I will showcase examples of applications of this method to study the structure of grain boundaries\, segregation phenomena at interfaces and displacive fcc/bcc phase transformations. 1.    O. Kapikranyan\, H. Zapolsky\, C. Domain\, R. Patte\, C. Pareige\, B. Radiguet\, P. Pareige « Atomic density function modeling of atomic structure of grain boundaries\, Phys. Rev. B.\, v.89\, 014111\, 20142.    O. Kapikranian\, H. Zapolsky\, R. Patte\, C. Pareige\, B. Radiguet\, and P. Pareige «Point defect absorption by grain boundaries in alpha iron by atomic density function modelling” Phys.Rev.B 92\, (2015) pp.224106.3.    H. Zapolsky “Kinetics of pattern formation: mesoscopic and atomistic modelling” ORDER\, DISORDER AND CRITICALITY\, Advanced Problems of Phase Transition Theory\, Volume IV\, \,pp 153-193\,       Ed. Y. Holovach\, World Scientific Publishing Co. 2015.4.    M. Lavrskyi\, H. Zapolsky\, A.G. Khachaturyan « Quasiparticle Approach to Diffusional Atomic Scale Self-Assembly of Complex Structures: from Disorder to Complex Crystals and Double Helix Polymers »\,       Nature Parther Journal Computational Materials\, 18 janvier\, 2016.5.    G Demange\, M Lavrskyi\, K Chen\, X Chen\, ZD Wang\, R Patte\, H Zapolsky « Atomistic study of the fcc→ bcc transformation in a binary system: Insights from the Quasi-particle Approach” Acta Mat.\, 226\, 117599 2022.   \n\n\n\n \n\n\n\nThis session was chaired by prof. Joakim Odqvist (KTH Royal Institute of Technology\, Sweden).
URL:https://mmelo.eu/event/online-lecture-by-prof-helena-zapolsky/
CATEGORIES:Online Lectures
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