| About this Abstract |
| Meeting |
2025 TMS Annual Meeting & Exhibition
|
| Symposium
|
Materials for Sustainable Hydrogen Energy
|
| Presentation Title |
Influence of Temperature, Loading Mode and Cyclic Predeformation on Hydrogen Embrittlement in an Austenitic Stainless Steel |
| Author(s) |
Vishnu Anilkumar, Frans Palmert, Lars Nyborg, Johan Ahlström, Yu Cao |
| On-Site Speaker (Planned) |
Vishnu Anilkumar |
| Abstract Scope |
Hydrogen-fueled gas turbines hold promise for sustainable energy, but their reliability depends on how hydrogen affects material properties, especially under fatigue loading. Start/stop cycles can shorten component lifespan, making it crucial to study hydrogen’s impact on fatigue resistance, particularly in the low cycle regime (<100,000 cycles). To investigate this, Low Cycle Fatigue (LCF) tests were conducted at room temperature in air on hydrogen-charged metastable austenitic stainless-steel specimens. Some specimens underwent precycling at varied strain amplitudes before pre-charging to assess the role of inelastic deformation in hydrogen uptake. Additional high-temperature tensile and LCF tests explored the effects of temperature and loading mode. Results show cyclic predeformation does not worsen the already existing hydrogen embrittlement (HE). While HE recovery occurs at high temperatures in tensile tests, HE was observed in LCF, highlighting the role of loading. Microstructural and fracture surface analysis using scanning electron microscopy and diffraction techniques provided further insights. |
| Proceedings Inclusion? |
Planned: |