About this Abstract |
| Meeting |
2026 TMS Annual Meeting & Exhibition
|
| Symposium
|
High Performance Steels
|
| Presentation Title |
Effect of Initial Microstructure on Austenite Reversion Kinetics and Elemental Partitioning During Inter-Critical Annealing of Medium Mn Steel |
| Author(s) |
Prita Pant, Subhas Bhunia, Shubo Wang, Harishchandra Singh |
| On-Site Speaker (Planned) |
Prita Pant |
| Abstract Scope |
We examine the effect of two different initial microstructures of medium Mn steel on the kinetics of austenite reversion and elemental partitioning using in-situ synchrotron and ex-situ S/TEM-based elemental mapping. These microstructures are tempered and cold-rolled (TCR) and hot-rolled and quenched (HRQ) martensite. The combination of synchrotron lattice parameter evolution and S/TEM elemental mapping shows that austenite growth during the initial holding stage occurs by carbon diffusion without any Mn partition in the HRQ sample, while in TCR samples, austenite growth, even at the initial stage, occurs along with both carbon and Mn partitioning. Our results prove that the mode of austenite reversion strongly influences the thermal stability of reverted austenite and the kinetics of austenite growth. As a result, HRQ samples have higher austenite growth kinetics but lower stability, while in the TCR samples, the austenite growth kinetics are slower, but the reverted austenite has higher thermal stability. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Phase Transformations, Other, Other |