| About this Abstract |
| Meeting |
2024 TMS Annual Meeting & Exhibition
|
| Symposium
|
Environmentally Assisted Cracking: Theory and Practice
|
| Presentation Title |
Hydrogen Embrittlement of Nickel-based Superalloys: Some Impacts of γ’-Ni3Al Precipitate States on Hardening Mechanisms and Damage Processes. |
| Author(s) |
Xavier Feaugas, Abdelali Oudriss, Siva Murugan |
| On-Site Speaker (Planned) |
Xavier Feaugas |
| Abstract Scope |
In present work, we have studied the impact of the individual and synergistic effects of hydrogen on the plasticity mechanisms of Waspaloy with various γ’-Ni3Al precipitation states (size and lattice misfit) in a hydrogen embrittlement perspective. Using micro indentation and TEM characterization three regimes of plasticity mechanisms (weekly coupled shearing, strongly coupled shearing and Orowan bypassing) were characterized. The solubility of hydrogen and the misfit of precipitate are correlated, and their evolution coincides with the three regimes previously defined. Under tensile loading, antagonist softening and hardening effects of hydrogen are related and commented on the base of TEM observations and precipitate state. The consequence of these processes on damage is formalized on a model to question intergranular fracture. Subsequently, a series of nanoindentation tests were performed on the samples in hydrogen pre-charged and uncharged conditions to question at nano-scales the hydrogen embrittlement. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Mechanical Properties, Environmental Effects, |