Abstract
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.
| Original language | English |
|---|---|
| Pages (from-to) | 2724-2736 |
| Number of pages | 13 |
| Journal | Journal of Materials Research and Technology |
| Volume | 26 |
| DOIs | |
| Publication status | Published - 2023 Sept 1 |
Bibliographical note
Publisher Copyright:© 2023 The Authors
All Science Journal Classification (ASJC) codes
- Ceramics and Composites
- Biomaterials
- Surfaces, Coatings and Films
- Metals and Alloys