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 |
The Effects of Temperature and Microstructure on Slip Localization in Microtextured Ti-6Al-2Sn-4Zr-2Mo Under Dwell Fatigue |
Author(s) |
Michelle E. Harr, Glenn H Balbus, Daniel Rhoads, Ayman Salem, Adam Pilchak, Thomas Broderick, Samuel Kuhr, Samantha Daly |
On-Site Speaker (Planned) |
Michelle E. Harr |
Abstract Scope |
Near-alpha titanium alloys, such as Ti-6242, experience a reduction in fatigue lifetime when the peak stress is held for each loading cycle. This sustained loading, also known as dwell fatigue, mimics the long periods of high mean stress experienced by titanium fan and compressor components during takeoff and cruise. The significant lifetime reduction is attributed to the phenomenon of load shedding, where the relaxation of a soft grain requires a neighboring hard grain to carry a higher load, thereby creating a favorable location for early crack nucleation. Both local microstructure and temperature are known to impact early crack nucleation, but the underlying mechanisms are still under active investigation. This work utilizes Digital Image Correlation (DIC), Electron Backscatter Diffraction (EBSD), Transmission Electron Microscopy (TEM), and Crystal Plasticity (CP) modeling at multiple length scales to investigate and statistically quantify the effects of temperature and local microstructure on damage accumulation during dwell fatigue. |
Proceedings Inclusion? |
Planned: |
Keywords |
Titanium, Mechanical Properties, |