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BEGIN:VEVENT
DTSTART;TZID=Europe/Brussels:20240321T150000
DTEND;TZID=Europe/Brussels:20240321T163000
DTSTAMP:20260623T222557
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:20260623T222557
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:20260623T222557
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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END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Brussels:20231116T150000
DTEND;TZID=Europe/Brussels:20231116T163000
DTSTAMP:20260623T222557
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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END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Brussels:20231019T110000
DTEND;TZID=Europe/Brussels:20231019T123000
DTSTAMP:20260623T222557
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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END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Brussels:20230921T150000
DTEND;TZID=Europe/Brussels:20230921T163000
DTSTAMP:20260623T222557
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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END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Brussels:20230615T150000
DTEND;TZID=Europe/Brussels:20230615T163000
DTSTAMP:20260623T222557
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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END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Brussels:20230511T150000
DTEND;TZID=Europe/Brussels:20230511T163000
DTSTAMP:20260623T222557
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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END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Brussels:20230420T150000
DTEND;TZID=Europe/Brussels:20230420T163000
DTSTAMP:20260623T222557
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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END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Brussels:20230316T150000
DTEND;TZID=Europe/Brussels:20230316T163000
DTSTAMP:20260623T222557
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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END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Brussels:20230216T150000
DTEND;TZID=Europe/Brussels:20230216T163000
DTSTAMP:20260623T222557
CREATED:20230207T165629Z
LAST-MODIFIED:20230703T125231Z
UID:1426-1676559600-1676565000@mmelo.eu
SUMMARY:Online Lecture by prof. Ernst Gamsjäger
DESCRIPTION:Phase transformations from a modelling perspective\n\n\n\n\n\n\n\n\n\nSpeaker: prof. dr. Ernst Gamsjäger\,  Montan Universität Leoben (Austria). \n\n\n\n\n\n\n\nTitle: Phase transformations from a modelling perspective \n\n\n\nAbstract: Information about stability ranges for various phases is crucial for materials design and process engineering. These stability ranges are represented by phase diagrams\, which are constructed by means of appropriate modelling approaches using thermodynamic databases.In the first part of the lecture the Debye-Einstein fitting approach for pure components and end members is compared with the frequently used temperature polynomials. Modelling of non-equilibrium processes also benefit from equilibrium thermodynamics. A thermodynamic system not far from equilibrium can be divided into a sufficiently large number of sub-systems\, where local equilibrium is assumed to hold in each sub-system. As long as the neighbouring sub-systems are in a different local equilibrium state a thermodynamic force (e.g. a difference in chemical potentials) drives a thermodynamic flux (e.g. the diffusive flux of a component in the system). Irreversible state changes will be considered in the second part of the lecture where the kinetics of growth and shrinkage of oxide crystals is investigated. The interfacial reaction and diffusion in the liquid bulk are considered as possible rate-controlling processes. The modelling approach combined with data analysis from key experiments reveals the underlying dissipative processes of solidification and melting phenomena\, here\, diffusion in the liquid bulk material and/or the interfacial reactions.Solid/solid phase transformations are the topic of the third part of the lecture. In particular the consequences of various heat treatments on the microstructure of steels is explored. Whereas dilatometry\, metallographic investigations and hardness measurements help to distinguish between martensite\, ferrite\, bainite and pearlite\, evaluating the X-ray diffractograms allows to quantify the phase fraction of austenite. The experimental investigations are evaluated by machine learning algorithms with the potential to relate microstructures to material properties. The classification of martensite\, ferrite\, bainite and pearlite is supported by an unsupervised machine learning algorithm (here hierarchical clustering) on the basis of measured X-ray diffractograms. \n\n\n\n \n\n\n\nThis session was chaired by prof. Jilt Sietsma (TU Delft).
URL:https://mmelo.eu/event/online-lecture-by-prof-ernst-gamsjager/
CATEGORIES:Online Lectures
ATTACH;FMTTYPE=image/png:https://mmelo.eu/wp-content/uploads/2023/02/Ernst-Gamsjager-100x13396dpi.png
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Brussels:20230119T150000
DTEND;TZID=Europe/Brussels:20230119T163000
DTSTAMP:20260623T222557
CREATED:20230111T204745Z
LAST-MODIFIED:20230703T125159Z
UID:1410-1674140400-1674145800@mmelo.eu
SUMMARY:Online Lecture by prof. dr. Andy Godfrey
DESCRIPTION:Grain-size dependence of mechanical properties in single-phase metals with a near-micrometer average grain size\n\n\n\n\n\n\n\n\n\nSpeaker: prof. dr. Andy Godfrey\,  Tsinghua University (Beijing). \n\n\n\n\n\n\n\nTitle: Grain-size dependence of mechanical properties in single-phase metals with a near-micrometer average grain size \n\n\n\nAbstract: Grain size control remains a major part of the physical metallurgy of single phase metals\, driven by the increase in strength with decreasing grain size as described by the Hall-Petch relationship. Considerable evidence now exists\, however\, for a transition on mechanical properties as the grain size is reduced to the near-micrometre regime\, where a positive deviation from the Hall-Petch relationship is found. Examples will be given in this lecture based on the use of samples prepared by spark-plasma sintering of powders for a range of metals\, where it is possible to achieve samples with near-micrometre average grain-size in a fully recrystallized condition. In the case of aluminium powders\, the native oxide on each powder allows also the effect of heterogeneity in grain size and spatial arrangement to be studied\, by mixing of powders with different average sizes. The spatial variation of plastic deformation at the grain scale has been explored in these samples by digital image correlation combined with electron backscatter diffraction measurements of the same area during in-situ deformation in a scanning electron microscope\, providing correlated information on local displacement gradients and crystal lattice rotations. Investigation of the mechanical properties of these samples raises questions about the nature of plastic yielding in single phase metals\, motivating in-situ deformation experiments using X-ray synchrotron radiation to allow measurements in 3D of the mesoscale pattern of plastic slip. \n\n\n\n \n\n\n\nThis session was chaired by prof. Leo Kestens (Ghent University – TU Delft).
URL:https://mmelo.eu/event/online-lecture-by-prof-dr-andy-godfrey/
CATEGORIES:Online Lectures
ATTACH;FMTTYPE=image/png:https://mmelo.eu/wp-content/uploads/2023/01/Andy-Godfrey-100x13396dpi.png
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Brussels:20221215T150000
DTEND;TZID=Europe/Brussels:20221215T163000
DTSTAMP:20260623T222557
CREATED:20221130T203919Z
LAST-MODIFIED:20231128T115620Z
UID:1398-1671116400-1671121800@mmelo.eu
SUMMARY:Online Lecture by prof. John Ågren
DESCRIPTION:Mats Hillert and materials science\n\n\n\n\n\n\n\n\n\nSpeaker: prof. John Ågren\,  KTH Stockholm. \n\n\n\n\n\n\n\nTitle: Mats Hillert and materials science. \n\n\n\nAbstract: Mats Hillert was one of the giants in materials science. Although he started in physical metallurgy his influence came to range over the whole of materials science\, from metallographic investigations of cast iron and steel to thermodynamics of semiconductors.In this talk I will discuss Mats’ contributions in some of his favorite topics.For example\, diffusional transformations in metallic alloys\, equilibrium and non-equilibrium interfaces\, grain growth\, CALPHAD modelling and the leadership in international collaborations. \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-john-agre/
CATEGORIES:Online Lectures
ATTACH;FMTTYPE=image/jpeg:https://mmelo.eu/wp-content/uploads/2022/11/John-Agre-100x13396dpi.jpg
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Brussels:20221117T150000
DTEND;TZID=Europe/Brussels:20221117T160000
DTSTAMP:20260623T222557
CREATED:20221003T080123Z
LAST-MODIFIED:20230703T124927Z
UID:1383-1668697200-1668700800@mmelo.eu
SUMMARY:Online Lecture by dr. Matteo Villa
DESCRIPTION:Kinetics approach to understand “martensitic” transformations in steel\n\n\n\n\n\n\n\n\n\nSpeaker: dr. Matteo Villa\, Technical University of Denmark. \n\n\n\nShort cv: Dr. Matteo Villa earned his PhD in 2014 from the Technical University of Denmark\, where he continued as a PostDoc and Researcher and where he currently is Senior Researcher since 2019. His research focuses on martensitic transformations in steels and titanium alloys and is largely of experimental character.For his work on steel\, he was awarded the Young Researcher Award from the Technical University of Denmark in 2014 and the Tom Bell Young Author Award from the International Federation of heat Treatment and Surface Engineering in 2016.  \n\n\n\n\n\n\n\nTitle: Kinetics approach to understand “martensitic” transformations in steel. \n\n\n\nAbstract: In the classical description as taught in undergraduate\, and many graduate\, materials science courses\, martensite in steel begins to form during cooling austenite below a critical temperature. In absence of partitioning\, the transformation proceeds on continued cooling\, irrespective of the applied cooling rate. In this classical picture\, interrupted cooling implies discontinuation of martensite formation and isothermal martensite is considered an annoying anomaly. Furthermore\, the classical approach considers martensite to have structural and morphological characteristics that are fully determined by the chemical composition of the parent austenite.A holistic collection of experimental evidence reveals the existence of various types of “martensitic” transformations that can occur simultaneously. Each of these transformations has its own mechanism with associated kinetics and structural characteristics. In this holistic picture\, the chemical composition of austenite is only one aspect.In the present contribution\, experimental work at the Technical University of Denmark is coupled with key observations in the literature to showcase the limitations of the current mainstream theory and advance our current understanding of “martensitic” transformations in steels. We distinguish between suppressible “martensite” and insuppressible martensite\, where insuppressible martensite forms instantaneously upon reaching a critical driving force for martensite formation\, while suppressible “martensite” can only form if sufficient thermal energy is available. The suppressibility is linked to the structural and morphological characteristics of the developing martensite\, hence to the internal structures in martensite and adjacent austenite. \n\n\n\n \n\n\n\nThis session was chaired by prof. Maria Santofimia (Delft University of Technology).
URL:https://mmelo.eu/event/online-lecture-by-dr-matteo-villa/
CATEGORIES:Online Lectures
ATTACH;FMTTYPE=image/png:https://mmelo.eu/wp-content/uploads/2022/10/Matteo-Villa-100x13396dpi.png
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Brussels:20221020T150000
DTEND;TZID=Europe/Brussels:20221020T160000
DTSTAMP:20260623T222557
CREATED:20220928T140832Z
LAST-MODIFIED:20230703T124829Z
UID:1371-1666278000-1666281600@mmelo.eu
SUMMARY:Online Lecture by prof. Satyam Suwas
DESCRIPTION:Understanding microstructural dependence of dwell fatigue in titanium alloys\n\n\n\n\n\n\n\n\n\nSpeaker: prof. Satyam Suwas\, Department of Materials Engineering\, Indian Institute of Science\, Bangalore\, India. \n\n\n\n\n\n\n\nTitle: Understanding microstructural dependence of dwell fatigue in titanium alloys. \n\n\n\nAbstract: The failure of the fan blades of the Rolls Royce gas turbine engine that powered the Lockheed Martin tristar aircraft in 1972\, has drawn considerable attention on ambient temperature dwell fatigue (DF) in titanium alloys.Now\, it is well known that titanium alloys (α\, near- α\, and a few α+β alloys) are sensitive to a dwell period at the peak load of an otherwise normal fatigue loading cycle.Many industrially relevant α and near α Ti alloys are susceptible to this rather unusual phenomenon. The phenomenon is very interesting in the sense that it is most pronounced at ambient temperature (~25 °C) and vanishes above 200 °C.Recent investigations have led to an understanding that the phenomenon is strongly dependent on micro-texture. Moreover\, the phenomenon is highly anisotropic.EBSD based investigations have led to the understanding that the difference in texture along different directions leads to the deformation heterogeneities during the deformation.These heterogeneities could be a possible cause for the anisotropy of dwell fatigue behaviour of titanium alloys along axial and transverse directions.In this colloquium\, a comprehensive understanding of the effect of microstructure and texture on the dwell fatigue of α and near-α titanium alloys will be presented. The role of strain hardening and strain rate sensitivity of the material on dwell fatigue as well as the role of texture on the anisotropy of dwell fatigue response will be elucidated. \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-satyam-suwas/
CATEGORIES:Online Lectures
ATTACH;FMTTYPE=image/jpeg:https://mmelo.eu/wp-content/uploads/2022/09/Satyam-Suwas-100x13396dpi.jpg
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Brussels:20220915T150000
DTEND;TZID=Europe/Brussels:20220915T160000
DTSTAMP:20260623T222557
CREATED:20211126T163428Z
LAST-MODIFIED:20220927T165712Z
UID:1028-1663254000-1663257600@mmelo.eu
SUMMARY:Online Lecture by prof. Nele Moelans
DESCRIPTION:Application of phase-field models in computer-aided design of multi-component alloys\n\n\n\n\n\n\n\n\n\nSpeaker: prof. Nele Moelans\, Department of Materials Engineering\, KU Leuven\, Belgium. \n\n\n\n\n\n\n\nTitle: Application of phase-field models in computer-aided design of multi-component alloys. \n\n\n\nAbstract: The interest in manipulating the properties of multi-component alloys is high today and phase-field models to simulate the evolution of microstructures have the capability to become an important tool in the computer-aided design of these multi-component alloys. Their advantage is that they can simulate the evolution of complex\, multi-phase microstructures during phase transformations\, deformation\, and annealing\, considering a wide range of phenomena\, such as bulk and grain boundary diffusion\, transformation strains\, and anisotropy in bulk and interface properties. However\, there are still challenges in applying the phase-field method to multi-component alloys. Obtaining the model parameters as a function of composition is required to obtain quantitative results\, but often complex and computationally expensive. Moreover\, as the number of major elements in the alloy increases\, the scope for alloy optimization also increases and the number of cases to be simulated increases exponentially with the number of elements. In addition\, the number of phases and complexity of a microstructure is often larger when the number of components in the alloy increases. In this presentation\, I will first give an overview of the state-of-the-art in phase-field modeling for multi-component alloys. Next\, I will discuss new methodologies recently developed in our group facilitating the application of phase-field models in multi-component alloy design. \n\n\n\nThis session was be chaired by prof. Joakim Odqvist (KTH).
URL:https://mmelo.eu/event/online-lecture-by-prof-nele-moelans/
CATEGORIES:Online Lectures
ATTACH;FMTTYPE=image/jpeg:https://mmelo.eu/wp-content/uploads/2021/12/Nele-Moelans-100x13396dpi.jpg
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Brussels:20220616T150000
DTEND;TZID=Europe/Brussels:20220616T160000
DTSTAMP:20260623T222557
CREATED:20220609T202605Z
LAST-MODIFIED:20230703T124736Z
UID:1343-1655391600-1655395200@mmelo.eu
SUMMARY:Online Lecture by prof. Claire Davis
DESCRIPTION:Approaches for rapid industrial adoption of new steels\n\n\n\n\n\n\n\n\n\nSpeaker: prof. Claire Davis\, University of Warwick. \n\n\n\n\n\n\n\nTitle: Approaches for rapid industrial adoption of new steels. \n\n\n\nAbstract:  How does the academic community support the rapid development and adoption of new steels and processes in the steel industry?The fundamental principles for developing new steels based on compositional and microstructural design to achieve properties are well developed and practiced\, particularly at the laboratory level. However\, industrial production generally involves multi-stage processing routes where all stages are important for microstructural development. In order to develop new steels / processes and consider the scale up implications for industrial exploitation\, laboratory facilities and modelling need to be capable of replicating all aspects of industrial processing\, including the limitations of existing processing plant capability and compositional control. Issues such as cooling rates and segregation during casting\, through thickness gradients during thermomechanical processing\, and sensitivity to annealing parameters need to be considered. This lecture will illustrate the major steps that need to be considered and controlled to achieve this using the example of microstructure development during casting\, reheating\, rolling and annealing for current and novel dual phase steels.In addition\, the role of in-situ microstructural determination techniques will be highlighted. \n\n\n\n \n\n\n\nThis session was chaired by prof. Erik Offerman (Delft University of Technology).
URL:https://mmelo.eu/event/online-lecture-by-prof-claire-davis/
CATEGORIES:Online Lectures
ATTACH;FMTTYPE=image/jpeg:https://mmelo.eu/wp-content/uploads/2022/06/Claire-Davis-100x13396dpi.jpg
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Brussels:20220519T150000
DTEND;TZID=Europe/Brussels:20220519T160000
DTSTAMP:20260623T222557
CREATED:20220519T200852Z
LAST-MODIFIED:20220519T201055Z
UID:1341-1652972400-1652976000@mmelo.eu
SUMMARY:Online Lecture by prof. dr. João Quinta da Fonseca
DESCRIPTION:Texture development during the hot forming and annealing of two phase Ti and Zr alloys\n\n\n\n\n\n\n\n\n\nSpeaker: prof. dr. João Quinta da Fonseca\, from Manchester University (UK). \n\n\n\n\n\n\n\nTitle: Texture development during the hot forming and annealing of two phase Ti and Zr alloys. \n\n\n\nAbstract: Texture control is of great importance during the processing of dual phase Ti and Zr alloys\, since texture affects their properties and performance in service. Although we have a good empirical understanding of the texture development during processing\, our fundamental understanding of the mechanisms responsible is lacking. We know that deformation\, phase transformation and recrystallization are all involved\, but there is no consensus on their relative importance and how it changes with changes in processing conditions.In this talk\, I will present results from recent studies on Ti and Zr alloys that aimed to unravel the contribution of these different mechanisms to the texture development in these important alloys. These studies included lab scale hot working simulations\, in-situ synchrotron and EBSD studies\, as well as computational experiments using crystal plasticity modelling. The results provide a new insights into this complex process and provide a basis for making improved predictions of texture evolution during the processing of these alloys. \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-dr-joao-quinta-da-fonseca/
CATEGORIES:Online Lectures
ATTACH;FMTTYPE=image/png:https://mmelo.eu/wp-content/uploads/2022/05/João-Quinta-da-Fonseca-100x13396dpi.png
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Brussels:20220421T150000
DTEND;TZID=Europe/Brussels:20220421T160000
DTSTAMP:20260623T222557
CREATED:20220331T081733Z
LAST-MODIFIED:20220525T103352Z
UID:1328-1650553200-1650556800@mmelo.eu
SUMMARY:Online Lecture by prof. Alexis Deschamps
DESCRIPTION:Mapping the kinetics of phase transformations in compositional space: a tool for alloy design\n\n\n\n\n\n\n\n\n\nSpeaker: prof. Alexis Deschamps\, SIMAP laboratory\, Graduate School of Engineering in Physics\, Electronics\, Materials Science\, Univ. Grenoble\, Alpes (France). \n\n\n\n\n\n\n\nTitle: Mapping the kinetics of phase transformations in compositional space: a tool for alloy design. \n\n\n\nAbstract: Mastering phase transformations is the primary tool for the metallurgist to control and optimize the microstructure and related properties of alloys. Phase transformations depend in complex ways on many parameters\, among which alloy composition\, thermal path\, plastic deformation play the most prominent role. Feeding predictive models describing the characteristics of phase transformations resulting from a given set of these parameters (phase fractions\, size\, morphology\, chemistry\, spatial distribution\, …) requires the acquisition of large amounts of quantitative data. This seminar will show how X-ray in-situ methods can give access to useful phase transformations parameters\, with examples given in nanoscale precipitation (using small-angle X-ray scattering SAXS) or allotropic transformations\, whether time-controlled or strain-induced (using high energy X-ray diffraction HEXRD)\, and how this information can be used for modelling. In a second part\, we will present how in-situ methods can be extended from time-resolved to combined time- and space-resolved\, and applied on compositionally-graded alloys. This combinatorial methodology will be shown to provide access to a massively improved coverage of compositional space for the characterization of phase transformation kinetics\, and thus serve to assess the robustness of models and accelerate alloy design \n\n\n\nThis session was be chaired by prof. Annika Borgenstam (KH – Stockholm).
URL:https://mmelo.eu/event/online-lecture-by-prof-alexis-deschamps/
CATEGORIES:Online Lectures
ATTACH;FMTTYPE=image/jpeg:https://mmelo.eu/wp-content/uploads/2022/03/Alexis-Deschamps-100x13396dpi.jpg
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Brussels:20220317T150000
DTEND;TZID=Europe/Brussels:20220317T160000
DTSTAMP:20260623T222557
CREATED:20220216T131624Z
LAST-MODIFIED:20220525T103427Z
UID:1312-1647529200-1647532800@mmelo.eu
SUMMARY:Online Lecture by prof. Jose A. Rodriguez-Martinez
DESCRIPTION:The effect of actual porous microstructure on the formation of dynamic necks\, adiabatic shear bands and plastic shock waves\n\n\n\n\n\n\n\n\n\nSpeaker: prof. Jose A. Rodriguez-Martinez\, Department of Continuum Mechanics and Structural Analysis\, University Carlos III of Madrid\, Spain. \n\n\n\n\n\n\n\nTitle: The effect of actual porous microstructure on the formation of dynamic necks\, adiabatic shear bands and plastic shock waves. \n\n\n\nAbstract: In this talk\, we present a novel microstructurally-informed finite element analysis to investigate the effect of actual porosity on the formation of dynamic necks\, adiabatic shear bands and plastic shock waves in metallic materials subjected to high strain rates. We have characterized by X-ray tomography the porous microstructure of different additively manufactured materials (aluminium alloy AlSi10Mg\, stainless steel 316L\, titanium alloy Ti6Al4V and Inconel 718L) with initial void volume fractions ranging from ≈0.0007% to ≈ 2%\, and pore sizes varying between ≈ 6 μm and ≈110 μm. The pore size distributions obtained from the tomograms have been fitted using a Log-normal statistical function\, which has been used in conjunction with a Force Biased Algorithm to generate finite element models in ABAQUS with actual distributions of voids. Four benchmark problems have been investigated: rapid radial expansion of rings\, dynamic torsion of thin-walled tubes\, collapse of thick-walled cylinders and dynamic cylindrical cavity expansion. The finite element results provide new insights into the role of void volume fraction\, voids size and voids shape on the formation of dynamic plastic instabilities for different loading rates and stress states. Selected comparison with in-house experimental results and with calculations carried out with homogenized Gurson-type constitutive models will be shown. The outcomes of the analysis provide indications on the capacity of additively-manufactured metals to absorb energy under impact loadings. \n\n\n\n \n\n\n\nThis session was be chaired by prof. Patricia Verleysen (Ghent University)
URL:https://mmelo.eu/event/online-lecture-by-prof-jose-a-rodriguez-martinez-2/
CATEGORIES:Online Lectures
ATTACH;FMTTYPE=image/jpeg:https://mmelo.eu/wp-content/uploads/2022/03/Jose-A.-Rodriguez-Martinez-100x13396dpi.jpg
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Brussels:20220217T150000
DTEND;TZID=Europe/Brussels:20220217T160000
DTSTAMP:20260623T222557
CREATED:20220126T100842Z
LAST-MODIFIED:20230703T124640Z
UID:1253-1645110000-1645113600@mmelo.eu
SUMMARY:Online Lecture by prof. Thomas Pardoen
DESCRIPTION:Recent progress in micromechanics-based approach of ductile fracture in metals\n\n\n\n\n\n\n\n\n\nSpeaker: prof. Thomas Pardoen – Institute of Mechanics\, Materials and Civil Engineering & Ecole Polytechnique de Louvain\, UCLouvain\, Belgium. \n\n\n\n\n\n\n\nTitle: Recent progress in micromechanics-based approach of ductile fracture in metals. \n\n\n\nAbstract: The mechanisms of nucleation\, growth and coalescence of voids leading to the fracture of ductile metals have been investigated for more than 50 years and modelled with increasing degrees of complexity. Nevertheless\, we are still far today from a fully predictive approach\, in particular in the context of the new generations of metallic alloys with advanced microstructures. Challenges remain on several fronts\, for instance: the description of the statistical aspects of void nucleation\, the transition into shear dominated failure mode\, the physical meaning of the internal lengths entering non local models\, the treatment of competing fracture mechanisms (e.g. inter-granular versus ductile)\, etc. In this talk\, recent progress made regarding the characterization and modelling of ductile fracture in Al alloys and in steel will be presented\, insisting on void nucleation aspects. \n\n\n\n \n\n\n\nThis session was chaired by prof. dr. Maria J. Santofimia Navarro (Delft University of Technology).
URL:https://mmelo.eu/event/online-lecture-by-prof-thomas-pardoen/
CATEGORIES:Online Lectures
ATTACH;FMTTYPE=image/jpeg:https://mmelo.eu/wp-content/uploads/2022/01/Thomas-Pardoen-100x13396dpi.jpg
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Brussels:20220120T150000
DTEND;TZID=Europe/Brussels:20220120T160000
DTSTAMP:20260623T222557
CREATED:20220118T161735Z
LAST-MODIFIED:20230703T124437Z
UID:1232-1642690800-1642694400@mmelo.eu
SUMMARY:Online Lecture by prof. Leo A.I. Kestens
DESCRIPTION:Texture Control in Metal Manufacturing : Theory and Practice\n\n\n\n\n\n\n\n\n\nSpeaker: prof. Leo A.I. Kestens – Department of Electromechanical\, Systems and Metal Engineering – Ghent University\, Belgium. \n\n\n\n\n\n\n\nTitle: Texture Control in Metal Manufacturing : Theory and Practice. \n\n\n\nAbstract: It is generally known that the crystallographic texture of metal alloys is formed during subsequent solid-state transformations\, occurring during manufacturing of the product.Applied to the specific case of metal sheet manufacturing\, it implies that the texture of the finished product is the result of the crystallographic phenomena involved in hot rolling\, cold rolling and annealing.Austenite-to-ferrite phase transformation\, plastic deformation\, recrystallization and grain growth are the dominant solid-state transformations occurring during thermo-mechanical processing of steel sheets.Moreover\, the crystallographic texture ensuing of a solid-state transformation is a characteristic feature of the physical mechanics underlying this transformation and therefore\, a precise understanding of the texture formation mechanisms is an important tool in gaining a better understanding of metal physics phenomena.The present lecture will give an overview of the current state-of-the-art in these issues. \n\n\n\n \n\n\n\nThis session was chaired by prof. Joakim Odqvist (KTH).
URL:https://mmelo.eu/event/online-lecture-by-prof-leo-a-i-kestens/
CATEGORIES:Online Lectures
ATTACH;FMTTYPE=image/jpeg:https://mmelo.eu/wp-content/uploads/2022/01/Leo-Kestens-100x13396dpi.jpg
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Brussels:20211216T150000
DTEND;TZID=Europe/Brussels:20211216T160000
DTSTAMP:20260623T222557
CREATED:20211126T120036Z
LAST-MODIFIED:20230703T124255Z
UID:908-1639666800-1639670400@mmelo.eu
SUMMARY:Online Lecture by prof. em. Wolfgang Bleck
DESCRIPTION:Some particular findings on microstructures and mechanical properties of advanced high strength steels\n\n\n\n\n\n\n\n\n\nSpeaker: prof. em. Wolfgang Bleck\, Steel Institute of RWTH Aachen University\, Germany. \n\n\n\n\n\n\n\nTitle: Some particular findings on microstructures and mechanical properties of advanced high strength steels. \n\n\n\nAbstract: Optimizing the balance of conflictive mechanical properties like strength\, toughness\, fatigue\, formability is the key issue of current steel and process development. Therefore\, new steel design concepts use high Mn contents for controlling low temperature phase transformations\, for stabilizing the fcc phase\, and for adjusting the stacking fault energy. By this\, extremely fine microstructures down to the nm-level could be achieved. Heterogeneous microstructure combines various phases\, including metastable phases\, enable new combinations of mechanical properties\, especially when phenomena such as the TRIP\, TWIP\, or MBIP effects are triggered. Materials that have one or more of these special features are summarized under the term Advanced High Strength Steels (AHSS).The talk will report on recent results for various steels. This will be done in the order of increasing manganese content as the characteristic alloying element for AHSS. In complex phase steels the challenging description of the heterogeneous microstructure will be discussed and the competition of dual phase and complex phase steel with respect to global and local formability will be elucidated. For air hardening steels\, the control of low temperature phase transformations is required for improved toughness and fatigue behaviour. With higher Mn contents in medium Mn steels metastable phases become interesting; this applies equally to the microstructure setting and to the mechanical properties. The interaction of alloying elements can no longer be neglected; special challenges in process technology now also have to be considered. This will be highlighted\, as an example\, for continuous casting and for continuous annealing.The lecture will look at developments in the recent past and show possible areas of application for the newly developed steels. Conclusions about the importance of new design principles are drawn. \n\n\n\nThis session was chaired by prof. Erik Offerman (TU Delft).
URL:https://mmelo.eu/event/online-lecture-by-prof-em-wolfgang-bleck/
CATEGORIES:Online Lectures
ATTACH;FMTTYPE=image/jpeg:https://mmelo.eu/wp-content/uploads/2021/11/Wolfgang-Bleck-100x13396dpi.jpg
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Brussels:20211118T150000
DTEND;TZID=Europe/Brussels:20211118T160000
DTSTAMP:20260623T222557
CREATED:20211118T174619Z
LAST-MODIFIED:20230703T123653Z
UID:353-1637247600-1637251200@mmelo.eu
SUMMARY:Online Lecture by prof. Sir Harry Bhadeshia
DESCRIPTION:Diffusion-controlled growth in multicomponent steels\, with steep concentration gradients\n\n\n\n\n\n\n\n\n\nSpeaker: prof. Sir Harry Bhadeshia\, Cambridge University\, United Kingdom. \n\n\n\n\n\n\n\nTitle: Diffusion-controlled growth in multicomponent steels\, with steep concentration gradients. \n\n\n\nAbstract: Since the work of Coates and others\, it has been considered that diffusion-controlled growth in multicomponent systems occurs in one of two ways\, assuming local equilibrium at the transformation front. Thus\, the growth either involves the long-range partitioning of substitutional solutes\, or a tiny amount of partitioning so that the product phase essentially has the same composition as that of the parent. But in the latter case\, steep gradients in concentration are predicted at the transformation front.Indeed\, these phenomena are encoded in most popular algorithms for estimating growth rates and therefore\, are applied widely.Coates himself recognised the difficulty of steep gradients. I will present some quantitative arguments to demonstrate that local equilibrium with negligible partitioning cannot exist and show that there is no experimental evidence to suggest otherwise. \n\n\n\nThe session was chaired by prof. Maria Santofimia Navarro (TU Delft).
URL:https://mmelo.eu/event/online-lecture-by-prof-sir-harry-bhadeshia/
CATEGORIES:Online Lectures
ATTACH;FMTTYPE=image/jpeg:https://mmelo.eu/wp-content/uploads/2021/11/Sir-Harry-Bhadeshia-100x13396dpi.jpg
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Brussels:20211021T133000
DTEND;TZID=Europe/Brussels:20211021T143000
DTSTAMP:20260623T222557
CREATED:20211019T150755Z
LAST-MODIFIED:20220216T111719Z
UID:226-1634823000-1634826600@mmelo.eu
SUMMARY:Online Lecture by snr. prof. Elena Pereloma
DESCRIPTION:Characterisation of Deformed Microstructure in Alloys Exhibiting Transformation-Induced Plasticity and/or Twinning-Induced Plasticity Effects\n\n\n\n\n\n\n\nSpeaker: Snr. prof. Elena Pereloma\, University of Wollongong\, Australia. \n\n\n\n\n\n\n\nTitle: Characterisation of Deformed Microstructure in Alloys Exhibiting Transformation-Induced Plasticity and/or Twinning-Induced Plasticity Effects. \n\n\n\nAbstract: Strength-ductility relationships deviate from the typical ones of reduction in ductility with strength increase in some metals and alloys. Such materials also exhibit high strain hardening rates. These unique mechanical properties are due to the accommodation of plastic deformation by twinning and/or phase transformations in addition to slip. Two main groups of these materials are medium-high Mn steels and metastable β titanium alloys. There is a continuous research effort aimed at microstructure control under different loading conditions in these alloys. This lecture will discuss the challenges of characterisation of deformation behaviour of metastable β titanium alloys from micro- to nano-level with the focus on the current understanding of complex hierarchical microstructures. \n\n\n\nThe session was chaired by prof. Leo Kestens (Ghent University).
URL:https://mmelo.eu/event/online-lecture-by-snr-prof-elena-pereloma/
CATEGORIES:Online Lectures
ATTACH;FMTTYPE=image/jpeg:https://mmelo.eu/wp-content/uploads/2021/10/Elena-Pereloma-133x100-1.jpg
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BEGIN:VEVENT
DTSTART;TZID=Europe/Brussels:20210916T150000
DTEND;TZID=Europe/Brussels:20210916T160000
DTSTAMP:20260623T222557
CREATED:20211018T211854Z
LAST-MODIFIED:20220216T111747Z
UID:159-1631804400-1631808000@mmelo.eu
SUMMARY:Online Lecture by prof. Dierk Raabe
DESCRIPTION:Sustainability of Metals and their role in a Circular Economy\n\n\n\n\n\n\n\n\n\nSpeaker: prof. Dierk Raabe\, Max-Planck-Institut für Eisenforschung\, Düsseldorf\, Germany. \n\n\n\n\n\n\n\nTitle: Sustainability of Metals and their role in a Circular Economy. \n\n\n\nAbstract: This presentation is about challenges and suited measures targeting the improvement of the sustainability of metallic alloys.Metals have enabled technological progress over millennia and have an enduring importance in our society. They paved the path of human civilization with load-bearing and functional applications that can be used under the harshest environmental conditions\, from the Bronze Age onwards. Only metallic materials encompass such diverse features as strength\, hardness\, workability\, damage tolerance\, joinability\, ductility and toughness\, often combined with functional properties such as corrosion resistance\, thermal and electric conductivity and magnetism.Today we produce and consume about 2 billion tons of metals every year\, with steels alone standing for a production of currently 1.85 billion tons per year. The huge and accelerating demand for load-bearing (structural) and functional metallic alloys in key sectors such as green energy supply\, infrastructures\, health\, durable construction\, robotics\, passenger safety and modern transportation is resulting in predicted production growth rates of up to 200% until 2050 [1].Most of these materials\, specifically steel\, aluminium\, nickel and titanium\, require a lot of energy when extracted and manufactured and these processes emit large amounts of greenhouse gases and pollution. This means that the huge success of metallic products and industries also brings them into a position where they have an important role in addressing the rapidly rising environmental crisis.The availability of metals (some of the elements used in alloys are among the most abundant ones)\, efficient mass producibility\, low price and amenability to large-scale industrial production (from extraction to the metal alloy) and manufacturing (downstream operations after solidification) have become a substantial environmental burden: worldwide production of metals leads to a total energy consumption of about 53 exa Joules (8% of the global energy used) and 35% of industrial CO2-equivalent emissions (4.4 gigatons of carbon dioxide equivalent) when counting only steels and aluminium alloys (the largest fraction of metal use by volume).This lecture discusses methods for improving the direct sustainability of structural metals\, in areas including reduced-carbon-dioxide primary production\, recycling\, scrap-compatible alloy design\, contaminant tolerance of alloys and improved alloy longevity. The lecture also discusses the effectiveness and technological readiness of individual measures and also shows how novel structural materials enable improved energy efficiency through their reduced mass\, higher thermal stability and better mechanical properties than currently available alloys [1].[1] Raabe D\, Tasan CC\, Olivetti EA. Strategies for improving the sustainability of structural metals. Nature. 2019 Nov; 575 (7781): 64-74. \n\n\n\nThe session was chaired by prof. Annika Borgenstam (KTH Royal Institute of Technology).
URL:https://mmelo.eu/event/online-lecture-by-prof-dierk-raabe/
CATEGORIES:Online Lectures
ATTACH;FMTTYPE=image/jpeg:https://mmelo.eu/wp-content/uploads/2021/10/Dierk-Raabe-133x100-1.jpg
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BEGIN:VEVENT
DTSTART;TZID=Europe/Brussels:20210617T150000
DTEND;TZID=Europe/Brussels:20210617T160000
DTSTAMP:20260623T222557
CREATED:20211018T181832Z
LAST-MODIFIED:20220216T111849Z
UID:146-1623942000-1623945600@mmelo.eu
SUMMARY:Online Lecture by prof. dr. Dorte Juul Jensen
DESCRIPTION:Metal Microstructures in 3D and 4D\n\n\n\n\n\n\n\n\n\nSpeaker: prof. dr. Dorte Juul Jensen\, from Danish Technical University\, Risoe\, Denmark. \n\n\n\n\n\n\n\nTitle: Metal Microstructures in 3D and 4D. \n\n\n\nAbstract: Characterization of metal microstructures in 3D is not new. But a new ‘wave’ of experimental methodologies emerged during the late 1990ies – early 2000ies\, fueled by novel possibilities at large international synchrotron facilities. Thereby also 4D (x\,y\,z\,time) investigations became possible. A short ‘evolution history’ of these methods is presented\, with focus on today’s possibilities and limitations. Examples of applications for recent studies of recrystallization are given\, highlighting scientific questions which cannot be addresses by more traditional experimental techniques. Possibilities for direct linking the experimental data to simulation tools are also discussed. Finally a view towards future development of similar 3D/4D techniques operating in home laboratories is given and it is demonstrated how grain mapping by these methods may be improved using artificial intelligence (deep learning) methods. \n\n\n\nThe session was chaired by prof. Leo Kestens (Ghent University).
URL:https://mmelo.eu/event/online-lecture-by-prof-dr-dorte-juul-jensen/
CATEGORIES:Online Lectures
ATTACH;FMTTYPE=image/jpeg:https://mmelo.eu/wp-content/uploads/2021/10/Dorte-Juul-Jensen-133x100-1.jpg
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BEGIN:VEVENT
DTSTART;TZID=Europe/Brussels:20210520T150000
DTEND;TZID=Europe/Brussels:20210520T160000
DTSTAMP:20260623T222557
CREATED:20211018T180053Z
LAST-MODIFIED:20220216T111909Z
UID:138-1621522800-1621526400@mmelo.eu
SUMMARY:Online Lecture by dr. Baptiste Gault
DESCRIPTION:Introduction to atom probe tomography: performance and opportunities in characterizing microstructures\n\n\n\n\n\n\n\n\n\nSpeaker: dr. Baptiste Gault\, Max-Planck-Institut für Eisenforschung\, Düsseldorf\, Germany. \n\n\n\n\n\n\n\nTitle: Introduction to atom probe tomography: performance and opportunities in characterizing microstructures. \n\n\n\nAbstract: Atom probe tomography is a burgeoning microscopy and microanalysis technique\, stemming from field-ion microscopy\, and allowing for compositional mapping of solid materials with sub-nanometre resolution and sensitivity in the range of tens of parts-per-million across all elements. In this lecture\, I will go back to the basics of the technique\, introduce the fundamental principles that enable the analysis but also limit the technique’s performance. I will showcase examples of applications to the compositional analyses of a range of microstructural features including grain and phase boundaries\, structural defects and secondary phases\, in relation to the host materials’ macroscopic physical properties. \n\n\n\nThe session was chaired by prof. Joakim Odqvist (KTH Royal Institute of Technology).
URL:https://mmelo.eu/event/online-lecture-by-dr-baptiste-gault/
CATEGORIES:Online Lectures
ATTACH;FMTTYPE=image/jpeg:https://mmelo.eu/wp-content/uploads/2021/10/Baptiste-Gault-133x100-1.jpg
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BEGIN:VEVENT
DTSTART;TZID=Europe/Brussels:20210415T150000
DTEND;TZID=Europe/Brussels:20210415T160000
DTSTAMP:20260623T222557
CREATED:20211018T071645Z
LAST-MODIFIED:20220216T111955Z
UID:58-1618498800-1618502400@mmelo.eu
SUMMARY:Online Lecture by prof. Ernst Kozeschnik
DESCRIPTION:Nucleation in poly-crystalline metallic structures: Classical Theory and recent extensions\n\n\n\n\n\n \n\n\n\n  \n\n\n\nSpeaker: prof. Ernst Kozeschnik\, Technical University Vienna\, Austria. \n\n\n\n\n\n\n\nTitle: Nucleation in poly-crystalline metallic structures: Classical Theory and recent extensions. \n\n\n\nAbstract: Nucleation is the initiating mechanism by which new phases occur in supersaturated solutions. In poly-crystalline materials\, heterogeneous nucleation sites can substantially facilitate the appearance of new phases. This lecture will introduce the main aspects of Classical Nucleation Theory (CNT)\, first\, and discuss\, which mechanisms need to be accounted for in the particular situation of metallic microstructures. The impact of nucleus size\, chemical composition of the nucleus and diffuse interfaces will be reviewed\, as well as some aspects of heterogeneous site energies and how they influence the nucleation barrier. Finally\, the model is used to demonstrate that nucleation at grain boundaries can occur with minimum or even without nucleation barrier\, as observed experimentally in continuous cooling DSC experiments in Al alloys. \n\n\n\nThe session was chaired by prof. Erik Offerman (Delft University of Technology).
URL:https://mmelo.eu/event/lecture-nucleation-in-poly-crystalline-metallic-structures-classical-theory-and-recent-extensions/
CATEGORIES:Online Lectures
ATTACH;FMTTYPE=image/png:https://mmelo.eu/wp-content/uploads/2021/10/Ernst-Kozeschnik-133x100-1.png
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