Rate effects on transformation kinetics in a metastable austenitic stainless steel
Rakan Alturk, William E. Luecke, Steven P. Mates, A Araujo, K. S. Raghavan, Fadi Abu-Farha
In this study, the effects of strain rate on the mechanical properties and the strain-induced austenite-to-martensite transformation in 201 austenitic stainless steel (SS201) were investigated. This grade was selected as a low-cost stainless steel with good lightweighting potentials for automotive applications. The material was tested in tension at a quasi-static rate (5x10^-2 s^-1 ), two low-intermediate rates (10^0 s^-1 and 10^1 s^-1 ), and a high rate (5x10^2 s^-1 ). 3D digital image correlation was used to enable accurate strain measurements during mechanical testing. Magnetic induction and X-ray diffraction were used ex-situ of deformation to measure the volume fraction of martensite formed at each strain rate, for different plastic strain levels. The effects of strain rate on deformation-induced martensite formation and on the stress/strain behavior was captured, and was compared to the results reported in the literature for 3xx austenitic stainless steels. The results show a favourable response for the SS201, which exhibits a substantial increase in strength and energy absorption at high rates without compromising tensile ductility.
, Luecke, W.
, Mates, S.
, Araujo, A.
, , K.
and Abu-Farha, F.
Rate effects on transformation kinetics in a metastable austenitic stainless steel, Procedia Engineering, [online], https://doi.org/10.1016/j.proeng.2017.10.1059
(Accessed July 31, 2021)