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张纪奎,陈百汇,张向.电弧增材制造钛合金界面处残余应力及其影响研究[J].稀有金属材料与工程(英文),2018,47(3):920~926.[Zhang Jikui,Chen Baihui and Zhang Xiang.Residual Stress and its Influence at the Interface of Wire + Arc Additive Manufactured Titanium Alloy[J].Rare Metal Materials and Engineering,2018,47(3):920~926.]
Residual Stress and its Influence at the Interface of Wire + Arc Additive Manufactured Titanium Alloy
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Received:January 14, 2016  Revised:July 15, 2016
Key words: Additive manufacturing  titanium alloy  residual stress  interface  contour method  fatigue crack growth  finite element model
Foundation item:国家留学基金委资助(项目号201406025015)
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Zhang Jikui,Chen Baihui and Zhang Xiang  
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      A Ti-6Al-4V wall was fabricated by WAAM on the basis of substrate alloy. Residual stress in the WAAM-substrate wall was measured by using contour method. There were considerable residual stresses in the WAAM-substrate wall. A finite element model was developed to simulate stress release in the cutting processing of the compact tension (C(T)) specimen from the wall. The calculated residual stress retained in the C(T) specimen was in good agreement with the measurement result obtained by contour method. Residual stress evolution and its effects on the crack propagation behavior at the WAAM/substrate interface were estimated by the developed finite element model. Following observations are revealed by experimental and numerical analysis. Residual stress distributions are quite different in the Type A and C specimen. For Type A specimen (notch located in the substrate), the compression residual stress area is closed to the notch, whereas for the Type C specimen (notch located in the WAAM alloy), the compression residual stress area is far away from the notch. Residual stresses has a little effect on the fatigue crack growth life of Type A specimen since most of them are released after the crack quickly entered and went through the compression area. However, residual stresses decrease a little with the crack growth at a long period for Type C specimen, which results a considerable stress intensity factor and shortens the fatigue crack growth life.