|About this Abstract
||2022 TMS Annual Meeting & Exhibition
||Ultrafine-grained and Heterostructured Materials (UFGH XII)
||Effect of grain size on the tensile properties and strain localization behavior of 304 stainless steel
||Si Gao, YU BAI, Wenqi Mao, Akinobu Shibata, Nobuhiro Tsuji
|On-Site Speaker (Planned)
In the present study, UFG microstructures were obtained in a commercial 304-type austenitic stainless steel by a two-step cold rolling and annealing process. It was found that the tensile behavior changed dramatically with decreasing the average grain size of the steel. A transition from continuous yielding to discontinuous yielding was observed by decreasing the average grain, and a yield-drop followed by a huge Lüders strain of 40% elongation was observed in the specimen having a mean grain size of 0.32 µm. Using the experimental results of microstructure observation by SEM-EBSD and the digital image correlation (DIC) characterization on the deformation behavior, the tensile properties as well as strain localization behavior are interpreted in the context of the grain size dependence of strain hardening rate and the kinetics of deformation induced martensite during tensile deformation.
||Mechanical Properties, Phase Transformations, Iron and Steel