|About this Abstract
||2018 TMS Annual Meeting & Exhibition
||Fatigue in Materials: Fundamentals, Multiscale Modeling and Prevention
||Temperature and Microstructural Dependence of Dwell Fatigue in Dual-phase Titanium Alloys
||Michelle Harr, Samantha Daly, Adam Pilchak
|On-Site Speaker (Planned)
Dual-phase titanium alloys, such as Ti-6242, experience a significant reduction in fatigue lifetime when the load is held at the peak of each loading cycle. This reduction in lifetime is believed to occur due to load shedding, where the stress relaxation of a soft grain requires a neighboring hard grain to carry a higher stress, creating a favorable location for crack nucleation and faceting. Ambient temperature and local microstructure have a significant impact on this load transfer and the associated component failure, but the mechanisms that underlie this behavior are still under active investigation. This work utilizes Digital Image Correlation (DIC) and electron backscatter diffraction (EBSD) at various length and temperature scales to experimentally investigate and statistically quantify the heterogeneity of damage accumulation during load shedding with respect to temperature and microstructure.
||Planned: Supplemental Proceedings volume