About this Abstract |
Meeting |
2024 TMS Annual Meeting & Exhibition
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Symposium
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Advanced Characterization Techniques for Quantifying and Modeling Deformation
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Presentation Title |
Crystal Plasticity Investigation of Microstructural Thermo-mechanical Fatigue Damage Mechanisms under Various Phasing Profiles Leveraging High-energy X-ray Diffraction Microscopy |
Author(s) |
Brandon T. Mackey, Ritwik Bandyopadhyay, Sven Gustafson, Michael D. Sangid |
On-Site Speaker (Planned) |
Brandon T. Mackey |
Abstract Scope |
Nickel-based superalloys are used for safety-critical components in the aerospace industry because of their high strength at elevated temperatures. These materials are subjected to complex thermal and mechanical cycling due to service conditions, which leads to thermo-mechanical fatigue (TMF) failure. The failure mechanisms associated with TMF are dependent on microstructural characteristics and loading parameters, such as temperature, strain range, and strain-temperature phasing. Micromechanical TMF damage mechanisms are investigated with a temperature-dependent, dislocation density-based crystal plasticity model, in which the model’s temperature dependent capabilities are examined via direct instantiation of, and comparison to, a high-energy X-ray diffraction microscopy (HEDM) experiment under thermo-mechanical loads. A set of statistically equivalent microstructures are simulated under various thermo-mechanical loading profiles (e,g in-phase, out-of-phase, and isothermal), where experimentally validated micromechanical metrics quantifying damage accumulation, gradients in plasticity, slip system activity, and grain neighbor interactions are predicted to correlate physical mechanisms related to variability in TMF performance. |
Proceedings Inclusion? |
Planned: |
Keywords |
Computational Materials Science & Engineering, High-Temperature Materials, Characterization |