About this Abstract |
| Meeting |
2026 TMS Annual Meeting & Exhibition
|
| Symposium
|
2026 Technical Division Student Poster Contest
|
| Presentation Title |
SPG-88: Interaction of Alloying Elements With Martensite/Austenite Interfaces During Intercritical Annealing of a Fe-10Ni-0.1C Steel |
| Author(s) |
Zehao Li, Dieter Isheim, Zugang Mao, Chia-Pao Lee, Amir Farkoosh, David Seidman |
| On-Site Speaker (Planned) |
Zehao Li |
| Abstract Scope |
Fe–Ni–C martensitic steels attain an exceptional balance of strength and toughness through austenite reversion during intercritical annealing, where martensite grain boundaries strongly influence solute redistribution. We examine solute segregation at martensite/¬austenite (α′/γ) interfaces during lamellarization at 650 °C in a Fe–10Ni–0.1C (10 wt.% Ni) steel alloyed with Mo, Cr, and Mn. Transmission electron microscopy shows the co-existence of retained austenite and fresh martensite at prior-austenite and martensite lath boundaries. Atom probe tomography reveals nearly identical Ni and Mn partitioning between retained austenite and fresh martensite, along with pronounced Mo and Cr segregation at α′/γ interfaces. First-principles calculations confirm the energetic preference of such segregation tendency and the resultant reduction in the α′/γ interfacial energy, thereby enhancing austenite stability. These findings clarify the solute–interface interactions affecting austenite reversion during intercritical annealing and provide guidance for optimizing the strength-toughness synergy in 10 wt.% Ni steels. |
| Proceedings Inclusion? |
Undecided |
| Keywords |
Iron and Steel, Phase Transformations, Characterization |