| About this Abstract |
| Meeting |
2025 TMS Annual Meeting & Exhibition
|
| Symposium
|
Recent Advances in Titanium Science and Technology: MPMD/SMD Symposium Honoring Professor Dipankar Banerjee
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| Presentation Title |
Insights on Dwell Fatigue from In-situ and 3D Microstructural Investigations |
| Author(s) |
Joe Wendorf, Madeline Vailhe, McLean Echlin, Jean Charles Stinville, Samuel Hemery, Tresa M. Pollock |
| On-Site Speaker (Planned) |
Tresa M. Pollock |
| Abstract Scope |
Near-alpha and alpha/beta titanium alloys widely deployed in turbine engine components can exhibit a significant reduction in fatigue life when the loading cycle includes a sustained peak load. An additional dwell fatigue debit is associated with millimeter-scale regions of neighboring α grains with highly aligned crystallographic orientations, known as microtextured regions (MTRs). Plasticity and crack initiation has been studied in MTR-containing Ti-6Al-4V and Ti-7Al with a variety of techniques, including in-situ digital image correlation, in-situ high energy X-ray diffraction microscopy (HEDM), TriBeam tomography and mechanical modeling. The role of grain neighborhoods within and near MTRs and basal twist boundaries in crack initiation will be discussed. Individual grains in HEDM experiments undergo a significant reduction in the variability of their local stress state during relaxation. Implications for dwell fatigue mechanisms will be discussed. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Mechanical Properties, High-Temperature Materials, Characterization |