| About this Abstract |
| Meeting |
TMS Specialty Congress 2025
|
| Symposium
|
The 7th International Congress on 3D Materials Science (3DMS 2025)
|
| Presentation Title |
3D Characterization of Hydrogen-Induced Damage in X70 Steel Using Synchrotron X-Ray Tomography |
| Author(s) |
Victor OKUMKO, Thilo Morgeneyer, Yazid Madi, Henry Proudhon, Andrew King |
| On-Site Speaker (Planned) |
Victor OKUMKO |
| Abstract Scope |
Hydrogen embrittlement significantly degrades the mechanical properties of metals, affecting ductility, fracture toughness, and fatigue resistance. This study examines the initiation and propagation of hydrogen-induced damage in X70 stainless steel, utilizing smooth and round-notched tensile samples to evaluate stress triaxiality effects. High-resolution synchrotron X-ray tomography and Scanning Electron Microscopy were employed to analyse surface and internal damage under varying hydrogen pressures and strain rates. In-situ tensile tests at the PSICHE beamline facilitated simultaneous mechanical testing and imaging. Results from smooth tensile samples indicate that cracks primarily initiate at the surface under moderate strain rates, while low strain rates promote deeper hydrogen diffusion, leading to internal damage. The ongoing investigation of round-notched samples aims to elucidate geometry's role in stress concentrations and hydrogen impact on crack nucleation and growth. These findings will enhance the development of a multiscale numerical model for safer hydrogen infrastructure design under the European project HyWay. |
| Proceedings Inclusion? |
Undecided |