Interpretation of dynamic tensile behavior by austenite stability in 
ferrite-austenite duplex lightweight steels

Park, Jaeyeong; Jo, Min Cheol; Jeong, Hyeok Jae; Sohn, Seok Su; Kwak, Jai-Hyun; Kim, Hyoung Seop; Lee, Sunghak

doi:10.1038/s41598-017-15991-5

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Interpretation of dynamic tensile behavior by austenite stability in ferrite-austenite duplex lightweight steels

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Sohn, Seok Su
Microstructure Physics and Alloy Design, Max-Planck-Institut für Eisenforschung GmbH, Max Planck Society;

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Citation

Park, J., Jo, M. C., Jeong, H. J., Sohn, S. S., Kwak, J.-H., Kim, H. S., et al. (2017). Interpretation of dynamic tensile behavior by austenite stability in ferrite-austenite duplex lightweight steels. Scientific Reports, 7: 15726. doi:10.1038/s41598-017-15991-5.

Cite as: https://hdl.handle.net/21.11116/0000-0001-638A-4

Abstract

Phenomena occurring in duplex lightweight steels under dynamic loading are hardly investigated, although its understanding is essentially needed in applications of automotive steels. In this study, quasi-static and dynamic tensile properties of duplex lightweight steels were investigated by focusing on how TRIP and TWIP mechanisms were varied under the quasi-static and dynamic loading conditions. As the annealing temperature increased, the grain size and volume fraction of austenite increased, thereby gradually decreasing austenite stability. The strain-hardening rate curves displayed a multiple-stage strain-hardening behavior, which was closely related with deformation mechanisms. Under the dynamic loading, the temperature rise due to adiabatic heating raised the austenite stability, which resulted in the reduction in the TRIP amount. Though the 950 degrees C-annealed specimen having the lowest austenite stability showed the very low ductility and strength under the quasi-static loading, it exhibited the tensile elongation up to 54% as well as high strain-hardening rate and tensile strength (1038 MPa) due to appropriate austenite stability under dynamic loading. Since dynamic properties of the present duplex lightweight steels show the excellent strength-ductility combination as well as continuously high strain hardening, they can be sufficiently applied to automotive steel sheets demanded for stronger vehicle bodies and safety enhancement.