|About this Abstract
||2022 TMS Annual Meeting & Exhibition
||Ultrafine-grained and Heterostructured Materials (UFGH XII)
||Effect of grain refinement on plastic deformation and fracture in a Si-added high-Mn austenitic steel
||Sukyoung Hwang, Yu Bai, Si Gao, Akinobu Shibata, Nobuhiro Tsuji
|On-Site Speaker (Planned)
High-Mn austenitic steels are well known for their outstanding mechanical properties combining high strength and large ductility, which are believed to result from the formation of mechanical twins during plastic deformation. Meanwhile, the low yield strength of high-Mn austenitic steels has always been an issue for practical applications. Grain refinement is an effective way to improve the low yield strength of polycrystalline material according to the Hall-Petch relationship.
In the present study, 22Mn-0.6C-3Si steels with various mean grain sizes down to ultrafine grained (UFG) region were successfully fabricated by high pressure torsion (HPT) and subsequent annealing. The 22Mn-0.6C-3Si steel showed a unique mechanical behavior that the strength and ductility simultaneously increased with the grain refinement. The effect of grain refinement on the mechanical properties are discussed in relation to the deformation microstructures, and detailed results are shown and discussed in the presentation.
||Iron and Steel, Mechanical Properties, Phase Transformations