About this Abstract |
| Meeting |
11th Conference on Trends in Welding Research + Additive Manufacturing (TWR+AM)
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| Symposium
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11th Conference on Trends in Welding Research + Additive Manufacturing (TWR+AM)
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| Presentation Title |
Revealing High-Temperature Hydrogen Attack Mechanisms in SA516 Grade 70 Carbon Steel and Its Weldments Using an Integrated Experimental Approach |
| Author(s) |
Yiyu Wang, Yanli Wang, Xuesong Fan, Stoichko Antonov, Casey Carney, Alexander Kolesnikov, Yongqiang Cheng, Jorge Penso, Zhili Feng |
| On-Site Speaker (Planned) |
Yiyu Wang |
| Abstract Scope |
High-temperature hydrogen attack (HTHA) remains a critical structural integrity concern for carbon and low-alloy steel pressure vessels used in hydrogen production and hydroprocessing. A joint R&D effort supported by the U.S. Department of Energy, involving Oak Ridge National Laboratory, National Energy Technology Laboratory, and industry partners, aims to improve the fundamental understanding and assessment of HTHA. This work presents a comprehensive experimental framework integrating accelerated high-temperature, high-pressure hydrogen charging, creep testing with in-situ hydrogen exposure, high-resolution neutron scattering, and multi-scale microstructural characterization. Methane formation mechanisms during HTHA in SA516 Grade 70 carbon steel and weldments were directly probed using inelastic neutron scattering. Characteristic damage across weld regions was quantitatively evaluated, linking susceptibility to distinct weld microstructures. The effects of pre-charged HTHA damage on mechanical properties were also examined. The resulting high-fidelity dataset supports improved lifetime prediction models and enhances reliability of hydrogen service equipment. |
| Proceedings Inclusion? |
Undecided |