In this study, we investigated the hydrogen embrittlement (HE) of martensitic medium-Mn steels with varying levels of S and Ti contents using thermal desorption analysis, silver decoration, slow strain rate tensile testing, and fractography. The S or S-Ti added specimens demonstrated higher HE resistance compared to the S-free specimens. This is because the S or S-Ti added specimens had a large volume fraction of fine MnS or Ti(C,N)-MnS complex inclusions with a size less than ∼1 μm, which provide strong irreversible H trap sites. However, coarse elongated inclusions were found to be detrimental to HE resistance. Therefore, we concluded that to improve the HE resistance of martensitic medium-Mn steel, it is important to distribute a large volume fraction of fine MnS or Ti(C,N)-MnS complex inclusions without coarse elongated ones.
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Kim et al. (2023) studied this question.
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