| About this Abstract |
| Meeting |
MS&T24: Materials Science & Technology
|
| Symposium
|
Austenite Formation and Decomposition V: A Symposium in Memory of Prof. Mats Hillert
|
| Presentation Title |
Atomistically Informed Phase-Field Simulations of Phase Transformation |
| Author(s) |
Ayush Suhane, Matthias Militzer |
| On-Site Speaker (Planned) |
Matthias Militzer |
| Abstract Scope |
Austenite decomposition critically influences the mechanical properties of steels. Mats Hillert provided foundational understanding of how alloying elements affect migration of the austenite-ferrite interface and control phase transformation kinetics. These elements segregate to the interface reducing their migration rates due to solute drag and facilitate the formation of bainite and martensite in steels. In this work, we introduce an atomistically informed phase-field model to quantify the role of alloying elements in model binary and ternary alloys. We utilize binding energy data from atomistic calculations in a phase-field model and determine solute drag due to a fast-diffusing element (C in Fe) using nanoscale simulations. A methodology is proposed to account for solute drag during phase transformation in mesoscale. Extending the approach to ternary system with a slow diffusing element, the solute drag pressure is found to be consistent with the Hillert-Sundman model. Finally, the limitations of this approach are critically reviewed. |