Hydrogen Effects on Hall–Petch Coefficient and Fracture Strength in Pure Ni and Ni-20Cr Alloy: A Macroscopic Insight of the Hydrogen Embrittlement Mechanism
Abstract The effects of Cr and H on the yield and fracture strengths in pure Ni and Ni-20Cr alloy were investigated based on the Hall–Petch relationship. The Hall–Petch coefficient, which depends on the dislocation pile-up length and slip transfer resistance at the grain boundaries, drastically increased by 20 pct Cr addition and unchanged by gaseous hydrogen charging at 80 MPa. These results indicate that Cr increased the intergranular stress concentration associated with dislocation pile-up, whereas H did not.
Authors
- Hiroshi Kakinuma (ORCID: https://orcid.org/0000-0001-6944-0803)
- Eiji Akiyama (ORCID: https://orcid.org/0000-0001-6916-3703)
- Saya Ajito (ORCID: https://orcid.org/0000-0003-3444-9845)
- Motomichi Koyama (ORCID: https://orcid.org/0000-0002-5006-9976)
- Kota Tomatsu (ORCID: https://orcid.org/0000-0001-9657-8533)
Institutions
- Nippon Steel (Japan) (JP)
- Tohoku University (JP)
Publication Details
- Journal
- Metallurgical and Materials Transactions A
- Published
- 2025-01-23
- DOI
- https://doi.org/10.1007/s11661-025-07688-6
- Citations
- 5
- Primary Topic
- Hydrogen embrittlement and corrosion behaviors in metals
- Type
- article
- Field-Weighted Citation Impact
- 3.25
Funders
- Japan Society for the Promotion of Science
- Institute for Materials Research, Tohoku University
- Division of Materials Research