|About this Abstract
||2022 TMS Annual Meeting & Exhibition
||Ultrafine-grained and Heterostructured Materials (UFGH XII)
||Investigating the origin of unstable plastic flow in an ultrafine-grained Fe-22Mn-0.6C TWIP steel
||Jesada Punyafu, Sukyoung Hwang, Saito Hikaru, Nobuhiro Tsuji, Mitsuhiro Murayama
|On-Site Speaker (Planned)
The serrations have generally appeared on stress-strain curves of carbon-containing high-Mn austenitic steels. While dislocations-solute atoms interaction is considered as the main cause for years, how such nano-scale interaction can control global deformation behavior is still unclear. In this study, an Fe-22Mn-0.6C (wt. %) steel was tensile tested at room temperature and the dynamic strain distribution was measured by the digital image correlation (DIC) technique. The specimen was unloaded when the second Portevin-Le Chatelier (PLC) band was propagating at the center of gauge part. Three areas, i.e., forward edge, center and backward edge of PLC band were chosen to be investigated by the scanning-/-transmission electron microscopy (S/TEM) technique. The results showed an increase in dislocation density as the PLC band propagated. In addition, the density of stacking faults became higher toward the center of PLC band which could be a cause of localized deformation in carbon-containing high-Mn austenitic steels.
||Characterization, Iron and Steel, Other