| About this Abstract |
| Meeting |
2025 TMS Annual Meeting & Exhibition
|
| Symposium
|
Fatigue in Materials: Fundamentals, Multiscale Characterizations and Computational Modeling
|
| Presentation Title |
Strain Localization Near Grain and Twin Boundaries During Fatigue Studied Using In-Situ ECCI and HR-EBSD in Stainless Steel 316L |
| Author(s) |
Yang Su, Josh Kacher |
| On-Site Speaker (Planned) |
Yang Su |
| Abstract Scope |
To study how strain localization is influenced by grain and twin boundaries under cyclic loading conditions, high-resolution electron backscatter diffraction (HR-EBSD) and electron channeling contrast imaging (ECCI) were conducted along slip bands near boundaries during in-situ fatigue deformation in SS316L. Dislocation structures forming near grain/twin boundaries were monitored at different cycles during fatigue, and the elastic stress gradients associated with dislocation pile-ups/tangles were acquired. 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 associated with dislocation pile-ups is most prominent at peak tensile stress. In addition, the magnitude of pile-up stress was found to be influenced by the number of cycles and grain boundary character. In the case of twin boundaries, dislocations preferentially accumulated at kinks in the boundary, contributing to stress build up in the twin plane during fatigue. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Characterization, Mechanical Properties, Iron and Steel |