Twinning induced plasticity (TWIP) steels exhibit high strength and large ductility due to enhanced deformation twinning. Although it is well known that austenitic steels have lower susceptibility to hydrogen embrittlement (HE), some researches have reported that TWIP steels often show HE. Many factors could affect the HE behaviors and, so far, the relationship between the grain size and HE behaviors of TWIP steels remains unclear. The present study investigated the effect of grain size on HE behaviors of a high Mn TWIP steel.
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