|About this Abstract
||2018 TMS Annual Meeting & Exhibition
||Phase Transformations and Microstructural Evolution
||Modeling the Effect of Stress State on Martensitic Phase Transformation in Austenitic Steel
||Milovan Zecevic, Manas Vijay Upadhyay, Efthymios Polatidis, Helena Van Swygenhoven, Marko Knezecvic
|On-Site Speaker (Planned)
Austenitic steels such as 304 can exhibit martensitic phase transformation under applied deformation process. The amount of martensite for a given value of equivalent plastic strain is dependent on applied stress state, where the underlying mechanism governing the dependence is obscure.
We use elasto-plastic self-consistent (EPSC) model extended to treat phase transformations coupled with Olson-Cohen (OC) evolution law to study the effect of different stress states on phase transformation in austenitic steel.
The model is applied to experimental data containing different stress states at different temperatures. We find that two scalar quantities of stress state are important for phase transformation: (1) stress triaxiallity and (2) measure of resolved shear stress controlling the separation between partial dislocations. The results suggest that the effect of stress state is dependent on temperature through dependence of stacking fault energy and chemical driving force on temperature.
||Planned: Supplemental Proceedings volume