|About this Abstract
||2020 TMS Annual Meeting & Exhibition
||Advanced High Strength Steels IV
||Annealing Time Dependence of Tensile Properties of 8 wt% Mn Steel
||Xin Xu, Thomas Kwok, David Dye
|On-Site Speaker (Planned)
The automobile industry is interested in medium Mn steels due to their high strength, high ductility and potentially higher cost efficiency of production compared to high Mn steels. Their high performance arises from deformation twinning, strain-induced transformation, or both mechanisms. These mechanisms are significantly affected by the thermodynamic stability and stacking fault energy of austenite, which are largely influenced by its chemical composition. Intercritical annealing is commonly used to tune the composition and volume fraction of austenite. Therefore, the temperature and duration are critical. In this work, we systematically studied the effect of intercritical annealing time on element partitioning and resultant deformation mechanisms in an 8 wt.% Mn steel. A significant annealing time dependence of tensile properties has been revealed. Generally, as annealing time prolongs, the engineering tensile strength and strain hardening rate decrease but elongation increases. The relation of the annealing time, chemical composition and deformation mechanisms is discussed.
||Planned: Supplemental Proceedings volume