Online Lecture by prof. Hatem Zurob

Bainite Revisited- A diffusional-displacive model for the lengthening of bainitic ferrite

Department of Materials Science & Engineering, McMaster University, Canada

Title:
Bainite Revisited- A diffusional-displacive model for the lengthening of bainitic ferrite

Abstract:
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.

This session was chaired by prof. Erik Offerman (TU Delft, the Netherlands).