|About this Abstract
||2017 TMS Annual Meeting & Exhibition
||Advanced High-Strength Steels
||Microstructural Evolution and Mechanical Behavior of Medium Mn Steels Intercritical Annealed from Different Starting Structure
||Binhan Sun, Fateh Fazeli, Colin Scott, Stephen Yue
|On-Site Speaker (Planned)
The characteristics (e.g. fraction, stability and homogeneity) of retained austenite remain critical in controlling the mechanical properties of medium Mn steels. This work attempts to maximize the fraction of retained austenite in the intercritical annealed medium Mn steels (with 7 and 10 wt. % Mn), by applying different prior heat treatments before cold rolling. Several different structures were created through these treatments after cold rolling, including pearlite/bainite structure, martensite structure, and martensite, ferrite and retained austenite multi-phase structure. The microstructural evolution and mechanical behavior of the steels intercritical annealed from these different starting structures are investigated. Excellent combination of strength-ductility balance of ~55,000 MPa pct can be achieved. The results showed that the intercritical annealed austenite fraction could be influenced by the initial structure, however, the overall mechanical performance was only slightly affected, which indicates the dominant roles of other factors such as phase compositions and the extent of recrystallization.
||Planned: Supplemental Proceedings volume