About this Abstract |
| Meeting |
MS&T25: Materials Science & Technology
|
| Symposium
|
Corrosion of Advanced Materials: Theory and Practice
|
| Presentation Title |
Understanding High Temperature Hydrogen Attack (HTHA) in A516-G70 and C-0.5Mo Steels |
| Author(s) |
Yuan Tian, Casey Carney, Paul D. Jablonski, Martin Detrois, Stoichko Antonov |
| On-Site Speaker (Planned) |
Yuan Tian |
| Abstract Scope |
We investigated high-temperature hydrogen attack (HTHA) in two commercial steels used for methane reforming: A516-G70 and C-0.5Mo. Samples were exposed to hydrogen at a range of temperatures and high-pressures. Post-exposure, both yield strength and ductility were significantly reduced above a critical temperature. Microstructural analysis revealed that the degradation was due to extensive cementite dissolution accompanied by crack and blister formation. The distribution of cracks exhibited a dependence on both depth from the surface and crack size. Notably, C-0.5Mo alloy exhibited reduced susceptibility to hydrogen-induced damage, highlighting the role of alloying elements in stabilizing carbon containing phases. Furthermore, heat treatment (microstructural change) of the alloys was investigated and showed modest improvement in resistance, indicating the importance of carbide morphology. These results emphasize the influence of composition, microstructure and exposure conditions on the performance degradation mechanisms during HTHA. |