| About this Abstract |
| Meeting |
2025 TMS Annual Meeting & Exhibition
|
| Symposium
|
Mechanical Response of Materials Investigated Through Novel In-Situ Experiments and Modeling
|
| Presentation Title |
Hydrogen assisted vacancy production and its effects on creep in structural steels |
| Author(s) |
Yash Pachaury, Aaron Anthony Kohnert, Laurent Capolungo |
| On-Site Speaker (Planned) |
Yash Pachaury |
| Abstract Scope |
Hydrogen significantly affects plasticity in structural steels. It interacts with microstructural features and defects, which trap the hydrogen leading to higher hydrogen content in the material than would be present in a perfect lattice. Specifically, several experiments and first-principle calculations have revealed a hydrogen assisted vacancy production (HAVP) mechanism, whereby H stabilizes excess vacancies in the form of vacancy-hydrogen (VH) complexes. This work investigates the role of HAVP and its effect on creep deformation response of a model ferritic steel. We propose a full field crystal plasticity-based framework which accounts for diffusion, stress-assisted drift, reactions between vacancies, hydrogen and VH complexes, climb facilitated by VH complexes, and corresponding contributions to the plastic strain rate. A parametric study using this model reveals the dependence of excess vacancies on temperature and hydrogen gas pressure, and demonstrates the role of these excess vacancies on the creep response of the steel. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Modeling and Simulation, Mechanical Properties, Iron and Steel |