TC4钛合金刚性拘束热自压扩散连接接头疲劳性能分析

doi:10.11896/cldb.17100259

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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

Key words： rigid restraint thermal self-compressing bonding fatigue property discontinuous at bond interface infrared thermography

Published: 08 May 2019

CLC number:

TG44

Fund:This work was financially supported by the National Natural Science Foundation Youth Fund of China (51705491).

About author:: Yunhua Deng, born in 1987, is currently a senior engineer at AVIC Aeronautical Key Laboratory for Welding and Joining Technologies, China. He received his Ph.D. degree on materials processing engineering in Beihang University, China, in 2016. His research inte-rests include solid-state bonding, brazing, electron beam welding and numerical simulation.

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Cite this article:

DENG Yunhua,TAO Jun,MA Xuyi. Fatigue Behavior Analysis of TC4 Titanium Joints by Rigid Restraint Thermal Self-Compressing Bonding[J]. Materials Reports, 2019, 33(9): 1449-1454.

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http://www.mater-rep.com/EN/10.11896/cldb.17100259 OR http://www.mater-rep.com/EN/Y2019/V33/I9/1449

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