About this Abstract |
Meeting |
2023 TMS Annual Meeting & Exhibition
|
Symposium
|
Fatigue in Materials: Fundamentals, Multiscale Characterizations and Computational Modeling
|
Presentation Title |
Characterising Fatigue Crack Tip Deformation States in Nickel Base Superalloys: Slip Character, Strain Accumulation and Oxidation Effects |
Author(s) |
Philippa A. Reed, Andrew Hamilton |
On-Site Speaker (Planned) |
Andrew Hamilton |
Abstract Scope |
The process or plastic zone at a crack tip controls the rate of crack advance, but the combination of factors that control this are wide ranging. We can use markers or fiduciaries associated with the microstructure itself to help us assess the evolution of stress and strain responses. These can include SEM-DIC approaches, EBSD analysis and X-ray CT analysis. We can also assess the degree of slip planarity and the role of oxidation in both accelerating and decelerating crack advance. A clearer micromechanical view of the features affecting the crack tip deformation processes is now available to us, and the full field nature of these approaches allows a much richer evaluation of the fatigue propagation processes. Taken together with 3D evaluations via X-ray CT approaches we can decipher the effects of deformation and local micromechanics both ahead of the crack tip and in its wake on fatigue growth. |
Proceedings Inclusion? |
Planned: |
Keywords |
High-Temperature Materials, Mechanical Properties, Additive Manufacturing |