| About this Abstract |
| Meeting |
2025 TMS Annual Meeting & Exhibition
|
| Symposium
|
Steels in Extreme Environments
|
| Presentation Title |
Intense hydrogen-related acceleration of fatigue crack growth in high-strength steels: the mechanism and solution |
| Author(s) |
Motomichi Koyama, Tingshu Chen, Yuhei Ogawa |
| On-Site Speaker (Planned) |
Motomichi Koyama |
| Abstract Scope |
Hydrogen accelerates fatigue crack growth of steels in compact tension tests under 90 MPa hydrogen gas. The acceleration of fatigue crack growth becomes remarkable when the tensile strength increases to 900 MPa. The drastic acceleration of fatigue crack growth is related to the occurrence of brittle intergranular fracture. That is, improving resistance to monotonic tension-induced intergranular fracture is key to preventing hydrogen-related fatigue crack growth acceleration. In this context, we performed cyclic heat treatment to decrease the grain size of tempered martensitic steel. The grain refinement successfully mitigated hydrogen-related monotonic tension- and fatigue-induced intergranular cracking. Consequently, the hydrogen embrittlement resistances in tensile and fatigue tests were improved significantly. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Mechanical Properties, Iron and Steel, |