Toward a Better Understanding of Mechanical Properties in Medium Mn TRIP Steels
A physically based model for TRIP Medium Mn steels has been developed to predict the macroscopic behavior of multi-constituent Medium Mn TRIP steels.It includes the effects of grain size,volume fraction and local composition of each phase on flow stress and strain hardening.Adetailed description of the strain-induced martensitic transformation kinetics is given based on a generalized form of the Raghavan approach.The appearance of the much harder martensitic phase during plastic straining gives rise to a strong strain hardening.The matrix behavior is described using a model previously developed for ferritic–martensitic steels.The model is based on a detailed understanding of the hardening mechanisms of the individual constituent phases and their interactions.A quite simple but accurate homogenization approach is used to determine the TRIP steel behavior.The predicted evolution of strain-induced martensite volume fraction,flow stress and incremental work hardening is in good agreement with experimental data.The variations of mechanical properties as a function of annealing temperature (or annealing time) are due to the variations of martensite fraction,either fresh martensite formed during cooling after annealing,or strain induced martensite.The stability of austenite is of critical importance and is shown to decrease as grain size increases andC orMn content decreases.
transformation induced plasticity (TRIP) medium Mn steels structure-properties relationships Modeling
PERLADE Astrid ZHU Kangying
ArcelorMittal Global R&D - Maizieres, Voie Romaine, 57583 Maizières-Les-Metz, France
国际会议
成都
英文
619-623
2016-11-16（万方平台首次上网日期，不代表论文的发表时间）