About this Abstract |
Meeting |
2023 TMS Annual Meeting & Exhibition
|
Symposium
|
Mechanical Response of Materials Investigated through Novel In-situ Experiments and Modeling
|
Presentation Title |
An In-situ SEM Study on Hydrogen Embrittled Alloy 718 |
Author(s) |
Hamza Khalid, Bilal Mansoor |
On-Site Speaker (Planned) |
Hamza Khalid |
Abstract Scope |
Nickel alloy 718 drastically loses ductility and fracture toughness in environments containing hydrogen. Hydrogen embrittlement (HE) in nickel alloy 718 is complex and has a dependence on the microstructure of the alloy, intensity and duration of hydrogen exposure and the mode of mechanical loading applied. Previous work has shown a correlation of the presence of precipitate phases with a higher susceptibility to HE. Other work has shown lattice defects like certain GBs and dislocation slip bands (DSBs) causing crack initiation and propagation. We subject solutionized and aged tempers of hydrogen pre-charged alloy 718 to in situ tensile tests in the SEM and directly observe the deformation, crack initiation and propagation and eventual fracture. This technique allows us to image how the specimen deforms in elastic, plastic and post-necking regions. Based on these results, we explain the dependence of deformation and fracture of hydrogen embrittled alloy 718 on its microstructure. |
Proceedings Inclusion? |
Planned: |
Keywords |
Environmental Effects, Other, Other |