Frontiers in Energy Research· 2026Q2
Mechanical properties of SS310 and IN625 following high-temperature hydrogen exposure
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- Q2SCImago
- 2026year
Short summary
SS310 and IN625 alloys exposed to 900°C hydrogen for up to 33 days showed significant degradation, including sharp toughness losses and intergranular fracture, while exposure at 450°C resulted in only modest property changes.
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Key points
- SS310 and IN625 alloys were exposed to 450°C and 900°C hydrogen for up to 33 days.
- At 900°C, both alloys showed significant degradation, including sharp toughness losses and intergranular fracture.
- At 450°C, hydrogen exposure caused only modest changes in the mechanical properties of both alloys.
- Microstructural analysis revealed evolving lattice parameters at 900°C, consistent with hydrogen degradation mechanisms.
AI-generated from the title and abstract; the full text is not read.
Abstract
This paper seeks to address knowledge gaps regarding the stability of stainless steel and Inconel alloys to continuous high-temperature H 2 exposure. Stainless steel 310 (SS310) and Inconel 625 (IN625) were continuously exposed to hydrogen at 450 °C and 900 °C for up to 33 days. Materials properties were periodically examined through tensile, Charpy impact, and three-point bend tests; microstructure was examined by electron microscopy and X-ray diffraction. At 450 °C, both materials exhibit resilience to hydrogen ingress, with tensile, impact, and bend tests showing only modest changes in strength and ductility. At 900 °C, both alloys undergo pronounced degradation that bring sharp losses in toughness, intergranular fracture features, and evolving lattice parameters. These responses are compared with previously presented mechanisms of high-temperature hydrogen degradation.
The authors' abstract, as published at the source. Frontiers in Energy Research, 2026 · DOI ↗
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Field: Metals and Alloys
Metals and AlloysMaterials Science