About this Abstract |
Meeting |
2021 TMS Annual Meeting & Exhibition
|
Symposium
|
Environmentally Assisted Cracking: Theory and Practice
|
Presentation Title |
Macroscale-based Approaches for Assessing the Influence of Hydrogen on the Deformation Behavior of Polycrystalline Ni |
Author(s) |
Zachary D. Harris, Sean Agnew, James Burns |
On-Site Speaker (Planned) |
Zachary D. Harris |
Abstract Scope |
Our study seeks to leverage macroscale-based, but microstructurally-sensitive approaches to probe the influence of hydrogen on the deformation behavior of Ni-based alloys. Uniaxial tension experiments on Ni-201 charged to hydrogen contents ranging from 0 to 5000 appm are coupled with crystal plasticity simulations to specifically evaluate the effect of hydrogen on texture evolution and work hardening behavior. Results indicate that, for the strains of interest for hydrogen-assisted cracking (< 0.15), texture-based approaches are insensitive to anticipated hydrogen-induced modifications in deformation behavior. Conversely, the work hardening behavior of Ni-201 is found to be sensitive to hydrogen content, indicating that such frameworks may be useful for developing mechanistic understanding. In particular, both the dislocation storage and recovery rates are found to increase with hydrogen content, with the latter increasing strongly for concentrations greater than 4000 appm. These observations are then considered in the light of previously proposed mechanisms for hydrogen embrittlement. |
Proceedings Inclusion? |
Planned: |