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《Chinese Journal of Rare Metals》 2016-02
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Mechanical Properties of Ti6Al4V Alloy Prepared by Two Different Hot Isostatic Pressing Processes

Huang Jun;Xue Pengju;Cai Chao;Wei Qingsong;Shi Yusheng;Liu Jinhui;State Key Laboratory of Materials Processing and Die & Mould Technology,Huazhong University of Science and Technology;Modern Manufacture Engineering Center,Heilongjiang University of Science and Technology;  
Taking Ti6Al4 V alloy powder with size of 60 ~ 200 μm prepared by plasma rotating electrode process as experimental material,the effects of the two different hot isostatic pressing( HIP) processes on the room temperature tensile properties and fatigue properties of HIP specimens were tested. The result showed that under the process of in-phase increasing temperature and pressure and the process of firstly increasing temperature and secondly increasing pressure,the specimens had similar room temperature tensile properties. The corresponding tensile strengths σbwere 970 and 980 MPa,respectively. And the yield strengths σ0. 2were 876 and 880 MPa,respectively. The elongations δ were respectively 9. 1% and 10. 0%. The specimens fabricated under process of firstly increasing temperature and secondly increasing pressure had better fatigue performance with the fatigue limit stress of 450 MPa compared with those under process of in-phase increasing temperature and pressure with the fatigue limit stress of 350 MPa. The microstructure result showed that during the densification of process of in-phase increasing temperature and pressure,the stage of adjoining and rearrangement of the particles were prior to the stage of local plastic deformation on the boundary. The prior particle boundaries existed as regular spatial polygonal structure without big deformation and being broken. And particle surface diffusion of impurity element was insufficient. During the densification underprocess of firstly increasing temperature and secondly increasing pressure,the stage of adjoining and rearrangement of the particles happened at the same time with the stage of large plastic deformation. Powder particles were compressed and even torn,and as a result prior particle boundaries were broken into pieces. Powder particles wrapped and inserted to each other. What's more,the impurity on the particle surface reduced greatly using this process. Despite of coarse grain after HIP,all above had a positive impact on promoting the fatigue performance of part.
【Fund】: 国家自然科学基金项目(51375188);; 黑龙江省自然科学基金重点项目(ZD201104)资助
【CateGory Index】: TG146.23
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