|About this Abstract
||2017 TMS Annual Meeting & Exhibition
||Advanced High-Strength Steels
||Relationship between Impact Toughness, Prior Austenite Grain Boundaries and Microstructural Morphology in Medium Mn Steel
||Jeongho Han, Alisson Kwiatkowski da Silva, Dirk Ponge, Dierk Raabe, Sang-Min Lee, Young-Kook Lee, Sang-In Lee, Byoungchul Hwang
|On-Site Speaker (Planned)
Here we investigate the relation between microstructural morphology and impact toughness of intercritically Fe-7Mn-0.1C steel. The hot-rolled and annealed (HRA) specimen exhibited dual-phase lath-shaped microstructure due to absence of recrystallization of martensite matrix before the reverse transformation. The cold-rolled and annealed (CRA) specimen showed a dual-phase globular-shaped microstructure, because recrystallization and reversion were actively occurred during annealing. HRA specimen showed a poor low temperature toughness due to rapid intergranular crack propagation along the coarse prior austenite grain boundaries. In contrast, CRA specimen exhibited an improved low temperature toughness, because intergranular crack propagated along the fine ferrite and martensite grain boundaries.
||Planned: Supplemental Proceedings volume