Microstructural Effects on Thermal-Mechanical Alleviation of Cold Dwell Fatigue in Titanium Alloys

Cold dwell fatigue is a well-known problem in the titanium components of aircraft engines. The high temperature and low stress in-service conditions have been reported to give rise resistance through thermal-mechanical alleviation process. Here, tests at room component operating were performed on IMI834 alloy assess microstructural effects cold while eliminating effect chemical composition. ratcheting strain rates under different loading quantitatively investigated aid understanding alleviation.