Abstract
The influence of strain rate (10−3 ≤ ε˙ ≤ 10−5 s−1) on hydrogen embrittlement behavior of Fe−17Mn − 0.8C (wt.%) TWIP steel was investigated. Two types of specimens were tested; one (AR) was hot-rolled, and the other (GBE) was further processed by grain boundary engineering. After hydrogen charging, the fracture strength (FS) and ductility of AR samples decreased as ε˙ decreased, because increasing numbers of H atoms accumulated near crack tips. However, after hydrogen charging, the FS and tensile ductility of GBE samples were not decreased much even at low ε˙, because special boundaries suppressed hydrogen-induced crack initiation and propagation.
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