About this Abstract |
Meeting |
2021 TMS Annual Meeting & Exhibition
|
Symposium
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Mechanical Response of Materials Investigated through Novel In-situ Experiments and Modeling
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Presentation Title |
In-situ Investigation of Intergranular Crack Initiation in Hydrogen Embrittled Inconel 725 |
Author(s) |
Mengying Liu, Lai Jiang, Emmeline Sheu, Michael Demkowicz |
On-Site Speaker (Planned) |
Mengying Liu |
Abstract Scope |
We perform an in situ investigation of hydrogen-assisted crack initiation at grain boundaries in initially flaw-free samples of polycrystalline Inconel 725. We design specialized tensile specimens, introduce hydrogen into them using electrochemical charging, and perform in situ tensile tests in a scanning electron microscope (SEM). We used electron backscattered diffraction to correlate crack initiation processes with the underlying microstructure. Cracks are found to initiate at twin boundaries, including coherent twin boundaries. To elucidate the role of hydrogen and 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: |
Keywords |
Mechanical Properties, Environmental Effects, Copper / Nickel / Cobalt |