About this Abstract |
Meeting |
2020 TMS Annual Meeting & Exhibition
|
Symposium
|
Deformation and Transitions at Grain Boundaries VII
|
Presentation Title |
In-situ Investigation of Intergranular Crack Initiation in Hydrogen Embrittled Inconel 725 |
Author(s) |
Mengying Liu, Lai Jiang, Emmeline Sheu, Michael J. Demkowicz |
On-Site Speaker (Planned) |
Mengying Liu |
Abstract Scope |
We perform an experimental investigation of the mechanisms of hydrogen-assisted crack initiation at grain boundaries in initially flaw-free samples of polycrystalline Inconel 725 (UNS725). We design specialized tensile specimens, introduce hydrogen into them using electrochemical charging, and perform in situ tensile tests in a scanning electron microscope (SEM). Consistent with previous studies, cracks are found to initiate along grain boundaries, including coherent twin boundaries. To elucidate the effect of plasticity on the crack initiation process, we use digital image correlation (DIC) to characterize surface plastic strain distributions. Potential mechanisms for hydrogen-assisted crack initiation will be discussed. |
Proceedings Inclusion? |
Planned: Supplemental Proceedings volume |