| About this Abstract |
| Meeting |
2024 TMS Annual Meeting & Exhibition
|
| Symposium
|
Environmentally Assisted Cracking: Theory and Practice
|
| Presentation Title |
Kim-Kim-Suzuki (KKS) Phase Field Model for Hydrogen-assisted Cracking |
| Author(s) |
Gabriel Frank Bouobda Moladje, Antoine Ruffini, Yann Le Bouar, Alphonse Finel |
| On-Site Speaker (Planned) |
Gabriel Frank Bouobda Moladje |
| Abstract Scope |
Phase field modeling has been intensively used to simulate hydrogen-enhanced decohesion (HEDE) mechanism of hydrogen embrittlement. In the past studies, the critical energy release rate is explicitly written as a function of the hydrogen coverage to account for the lowering of the atomic bond strength due to the hydrogen segregation at the crack surface. We propose a new phase field approach, based on the KKS formalism, to simulate hydrogen-assisted cracking. This variational formulation accounts naturally for the decrease of the surface energy, in conjunction with the hydrogen segregation, by minimization of the total free energy of the system. Finally, we use this new model to perform a systematic study of the HEDE mechanism in Ni-based alloy and investigate in particular the role of the hydrogen-vacancy complexes formation and pre-existing microstructural features (dislocations, grain boundaries, …). |
| Proceedings Inclusion? |
Planned: |