About this Abstract |
| Meeting |
2026 TMS Annual Meeting & Exhibition
|
| Symposium
|
Fatigue in Materials: Fundamentals, Multiscale Characterizations and Computational Modeling
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| Presentation Title |
Strain Localization and Micro-Crack Formation Near Grain Boundary and Twin Boundary During Fatigue Studied Using In-Situ ECCI, HR-EBSD, and CAC Simulation in Austenitic Steel 316L |
| Author(s) |
Yang Su, Josh Kacher, Thanh Phan, Liming Xiong |
| On-Site Speaker (Planned) |
Yang Su |
| Abstract Scope |
Strain localization near grain and twin boundaries under fully reversed cyclic loading was studied using high-resolution electron backscatter diffraction (HR-EBSD) and electron channeling contrast imaging (ECCI) during in-situ fatigue deformation in austenitic steel 316L. Dislocation structures and associated stress fields near grain/twin boundaries were monitored at different cycles during fatigue. By comparing the stress magnitude and distribution at different cycles and at both peak tensile and compressive stresses, the magnitude of pile-up stress was found to be influenced by the number of cycles and grain boundary character. Micro-cracks formed on the surface were found almost exclusively near coherent twin boundaries and corresponded to irreversible dislocation slip near both slip band/twin boundary intersections and triple junctions. Dislocation structures near those intersections and junctions were analyzed post-mortem using TEM/FIB. Possible mechanisms involved in the dislocation/boundary interactions were explored using concurrent atomistic continuum (CAC) simulations. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Characterization, Modeling and Simulation, Iron and Steel |