Rate effects on transformation kinetics in a metastable austenitic stainless steel

Published

November 15, 2017

Author(s)

Rakan Alturk, William E. Luecke, Steven Mates, A Araujo, K. S. Raghavan, Fadi Abu-Farha

Abstract

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.

Citation

Procedia Engineering

Volume

207

Pub Type

Journals

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DOI Link

Keywords

austenitic , stainless steel , high-rate , mechanical properties

Citation

Alturk, R. , Luecke, W. , Mates, S. , Araujo, A. , Raghavan, K. and Abu-Farha, F. (2017), 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 April 18, 2024)