About this Abstract |
Meeting |
2024 TMS Annual Meeting & Exhibition
|
Symposium
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Fatigue in Materials: Fundamentals, Multiscale Characterizations and Computational Modeling
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Presentation Title |
Strain Localization and Slip Irreversibility in the Grain Boundary Vicinity Studied Using In Situ Fatigue and HR-EBSD in FCC Metals |
Author(s) |
Yang Su, Josh Kacher |
On-Site Speaker (Planned) |
Yang Su |
Abstract Scope |
To study how strain localization and slip irreversibility are influenced by grain boundaries under cyclic loading conditions, high-resolution electron backscatter diffraction (HR-EBSD) was conducted along slip bands formed during in situ fatigue deformation in both stainless steel 316L (medium grain size) and high purity nickel (large grain size). Elastic strain gradients and stress tensors associated with dislocation pileups/tangles were calculated in the grain boundary vicinity. By comparing the magnitude and distribution of stress tensors at different cycles and at both peak tensile and compressive stresses, it was found that the stress localization normally occurs in the grain boundary vicinity and is most prominent at peak tensile stress. In addition, the evolution of stress at increasing cycles was found to be influenced by grain boundary character and grain size. The slip irreversibility was also quantified using the peak value of the elastic stress. |
Proceedings Inclusion? |
Planned: |
Keywords |
Characterization, Iron and Steel, Mechanical Properties |