About this Abstract |
| Meeting |
2026 TMS Annual Meeting & Exhibition
|
| Symposium
|
Advances in Multi-Principal Element Alloys V: Mechanical Behavior
|
| Presentation Title |
Evaluation of hydrogen embrittlement of welded metals at 15 K |
| Author(s) |
Soo Yeol Lee, You Sub Kim, Tae Uk Kang, Soon-Ku Hong, E-Wen Huang |
| On-Site Speaker (Planned) |
Soo Yeol Lee |
| Abstract Scope |
Liquid hydrogen is utilized under extreme environments (i.e., temperature below 20 K and hydrogen-rich conditions), which provokes significant challenges in materials withstanding the harsh conditions. Generally, hydrogen embrittlement is widely observed at room temperature for metals, while it tends to diminish as the temperature decreases due to the lower hydrogen diffusivity at cryogenic temperatures. However, what we had overlooked was that discontinuous serrated deformation activated by dislocation avalanche induces a localized heating at such an ultra-cryogenic temperature. The dislocation avalanche can enhance the mobility of hydrogen through the dislocation cores and the localized-heating can promote hydrogen diffusion, thereby accumulating hydrogen at planar slip bands and leading to hydrogen-induced cracking. In this work, we investigate how much the synergistic effects of the discontinuous serrated deformation, hydrogen diffusion and accumulation have an impact on mechanical degradation. This study is expected to reshape the conventional understanding of hydrogen embrittlement at cryogenic environments. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Iron and Steel, Mechanical Properties, Characterization |