Abstract
A fully austenitic Fe-18Mn-2Si-2Al transformation-induced plasticity (TRIP) steel was tensile tested from quasi-static to low-dynamic regime at three different strain rates: 4.7 × 10−4, 1.3 × 10−1, and 8.3 × 100 s−1. Typical two-stage transformation mechanism, TRIP γ → ε → α′, was observed for samples tested at 4.7 × 10−4 s−1. At higher strain rates, the increase in temperature due to adiabatic plastic work shifts the stacking fault energy (SFE) towards a twinning-induced plasticity–SFE-range modifying the mechanical behavior of the alloy. This change on the deformation mechanism leads to a lower work hardening capacity and a higher elongation to rupture in samples tested at 1.3 × 10−1 and 8.3 × 100 s−1. In this context, the alloy maintains its energy absorption capability with a maximum reduction of 3.6 pct according to the Rm × A parameter. The Md temperature, experimentally determined in the present study, proved to be a useful tool for understanding the material’s behavior.
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Acknowledgments
The authors acknowledge the support of CONICET Argentina under Grants PUE096-IFIR and PDTS-251. As well, the contribution of Professor Dr.-Ing. Lais Mujica Roncery, Universidad Pedagógica y Tecnológica de Colombia, on thermodynamic calculations, and the support of Dr. Laura Buttigliero, IFIR-CONICET, by TEM characterization are acknowledged.
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Manuscript submitted April 4, 2019.
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Raposo, M., Martín, M., Giordana, M.F. et al. Effects of Strain Rate on the TRIP–TWIP Transition of an Austenitic Fe-18Mn-2Si-2Al Steel. Metall Mater Trans A 50, 4058–4066 (2019). https://doi.org/10.1007/s11661-019-05331-9
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DOI: https://doi.org/10.1007/s11661-019-05331-9