Fatigue Behavior Analysis of TC4 Titanium Joints by Rigid Restraint Thermal Self-Compressing Bonding
DENG Yunhua1,2
1 Aeronautical Key Laboratory for Welding and Joining Technologies, AVIC Manufacturing Technology Institute, Beijing 100024; 2 Key Laboratory on Power Beam Science and Technology, AVIC Manufacturing Technology Institute, Beijing 100024
Abstract: Rigid restraint thermal self-compressing bonding (TSCB) of TC4 titanium alloy was conducted by means of localized electron beam non-melted heating. Fatigue tests of TC4 titanium joints by rigid restraint TSCB under various stress levels were carried out, and the median fatigue life S-N curves of the joints were drawn according to the test results. Fatigue property of TC4 titanium joints by rigid restraint TSCB and the effect of defect at bonding interface on it were investigated through the analysis of S-N curves, observation of fatigue fracture by scanning electron microscope and the in situ observation of fatigue fracture process by infrared thermal imaging. It was found that the defect at bonding interface was prone to grow into fatigue crack which would reduce initiation time of fatigue crack, and resulted to a shortened total fatigue life of the joints compared with that of base metal. With the prolonging of heating time, the unwelded defect at bond interface of joint was reduced, which significantly improves the fatigue performance of TC4 titanium joint obtained by rigid restraint TSCB
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2019, Vol. 33 
