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 |
Microstructure Engineering to Disrupt Slip Localization: A New Approach to Enhance Fatigue Strength? |
Author(s) |
Yuheng Nie, Dhruv Anjaria, Robert Hayes, J.C. Stinville, Marie-Agathe Charpagne |
On-Site Speaker (Planned) |
Yuheng Nie |
Abstract Scope |
Polycrystalline nickel-base superalloys are subject to harsh environments during service, including repeated loading and thermal cycling. In these alloys, highly localized and often irreversible slip bands develop early on, near and parallel to long and coherent annealing twin boundaries, eventually leading to fatigue crack nucleation. Here, we utilize new thermo-mechanical processing pathways that lead to partially recrystallized microstructures consisting of deformed grains with high dislocation density and disrupted twin boundary coherency, surrounded by finer grains with lower dislocation density. By correlating high-resolution digital image correlation (HR-DIC) measurements with crystallographic orientation mapping obtained from electron back-scattered diffraction (EBSD), we reveal the mechanisms by which these unique microstructures disrupt the distribution and intensity of slip localization. We relate these quantitative measurements to the alloy’s fatigue strength using very high cycle fatigue (VHCF) testing using the conventionally processed version of the alloy as a reference. |
Proceedings Inclusion? |
Planned: |
Keywords |
Characterization, Mechanical Properties, |