Work Hardening Behavior of Medium Mn TWIP+TRIP Steel with a Bimodal Microstructure
The work hardening behavior of intercritically annealed 6% Mn steel with a bimodal microstructure was investigated.After intercritical annealing,the steel contained coarse-grained δ-ferrite and ultrafine-grained ferrite and retained austenite.Ductile ultra-high strength behavior was achieved by the combined activation of the twinning-induced (TWIP) and transformation-induced (TRIP) plasticity-enhancing mechanisms.The composition and stacking fault energy (SFE) of the retained austenite,both of which depend on the intercritical annealing temperature,are the key factors which determine the work hardening behavior of the steel.An excellent strength-ductility balance of approximately 26000~52000 MPa·% was achieved after intercritical annealing in the 740~880℃ temperature range.
medium Mn steel TRIP+TWIP mechanical properties bimodal microstructure
SHIN Sunmi LEE Seonjong KIM Woojun DE COOMAN B. C.
Materials Design Laboratory, Graduate Institute of Ferrous Technology, Pohang University of Science and Technology, Pohang, 790-784, South Korea
国际会议
成都
英文
72-75
2016-11-16（万方平台首次上网日期，不代表论文的发表时间）