About this Abstract |
| Meeting |
2026 TMS Annual Meeting & Exhibition
|
| Symposium
|
Fatigue in Materials: Fundamentals, Multiscale Characterizations and Computational Modeling
|
| Presentation Title |
On the Role of Hydrogen in Plasticity Mechanisms Associated With Cyclic Creep of a 304L Austenitic Stainless Steel |
| Author(s) |
Achraf Radi, Park Sungcheol, Abdelali Oudriss, Pierre Osmond, Gouenou Girardin, Fabien Lefebvre, Hisao Matsunaga, Xavier Feaugas |
| On-Site Speaker (Planned) |
Achraf Radi |
| Abstract Scope |
Decarbonized hydrogen is a key energy carrier in the transition to low-carbon systems. Austenitic stainless steels, widely used in hydrogen-related applications, show good resistance to embrittlement, though not full immunity. This study investigates the effect of hydrogen on the ratcheting behavior of 304L stainless steel at room temperature. The material was pre-charged with 100 wppm solute hydrogen in a pressurized H₂ environment. Three loading paths—single-step, increasing, and decreasing multi-step—were applied to assess the influence of maximum and mean stresses on the steady-state cyclic creep rate. Flow stress decomposition (back and effective stress) and TEM analyses revealed changes in dislocation structures and phase transformation as functions of loading and hydrogen. EBSD and XRD quantified phase evolution and linked surface and bulk responses. Hydrogen induced solid-solution hardening by hindering dislocation motion and affected the creep rate—either accelerating or slowing it—depending on stress and its interaction with strain-induced phase transformations. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Characterization, Phase Transformations, Mechanical Properties |