About this Abstract |
| Meeting |
2026 TMS Annual Meeting & Exhibition
|
| Symposium
|
Advances in Titanium Technology
|
| Presentation Title |
Cold Dwell Fatigue Damage Mechanism Analysis Using Statistically Large Datasets Generated by Reflected Light Dark Field Microscopy and Electron Backscatter Diffraction |
| Author(s) |
Anthony G. Spangenberger, Christopher Collins, Diana Lados |
| On-Site Speaker (Planned) |
Anthony G. Spangenberger |
| Abstract Scope |
Cold dwell fatigue (CDF) of titanium alloys is sensitive to the microtextural configuration of the material under test, but the diversity of microstructural ensembles makes the specification and severity of their characteristics difficult to determine. This study introduces reflected light dark field microscopy as a new technique for efficient, large-area, and high-resolution collection of statistically robust crack initiation and growth datasets during cyclic testing. The technique is applied to study fatigue and CDF of cross-rolled Ti-6Al-4V and identify crack initiation sites for electron backscatter diffraction (EBSD) analysis. Specific α-α twist boundaries are the predominant initiation site in both fatigue and CDF, and new metrics are proposed to screen microstructures for CDF sensitivity. Population crack growth parameters are studied to identify distinguishing features between the two loading modes. Fractographic analysis validates the use of surface observations for studying CDF, indicating that identical microstructural features initiate cracks at the surface and volumetrically. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Mechanical Properties, Titanium, Characterization |