About this Abstract |
Meeting |
2024 TMS Annual Meeting & Exhibition
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Symposium
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Fatigue in Materials: Fundamentals, Multiscale Characterizations and Computational Modeling
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Presentation Title |
Monitoring Vulnerable Grain Neighborhoods in Inconel-718 During Cyclic Loading Using High Energy X-ray Diffraction Microscopy |
Author(s) |
Dalton Shadle, Kelly Nygren, Tresa Pollock, Irene Beyerlein, Matthew Miller |
On-Site Speaker (Planned) |
Dalton Shadle |
Abstract Scope |
Investigating the onset of fatigue failure poses a significant challenge due to the complex processes driving crack initiation. This work aims to further our understanding of the underlying mechanisms that lead to crack initiation by “watching” the cyclic response of individual grains and their neighbors using in-situ high energy X-ray diffraction microscopy (HEDM). By integrating the mechanistic information of far-field HEDM with the microstructural neighborhood information of near-field HEDM, we characterize a polycrystalline Inconel-718 material in-situ during 128 fully-reversed loading cycles. We identify and track vulnerable grains throughout these loading cycles by analyzing the intragranular orientation distributions and grain-averaged stress states of each grain. Informed with a near field reconstructed microstructure, we examine the impact of local texture and stress states within these vulnerable neighborhoods. This research sheds light on the interplay between cyclic grain-scale behavior and material fatigue performance, facilitating the development of improved fatigue-resistance in materials. |
Proceedings Inclusion? |
Planned: |
Keywords |
Characterization, Mechanical Properties, |