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Temperature-gradient induced microstructure evolution in heat-affected zone of electron beam welded Ti-6Al-4V titanium alloy

查看全文 作　　者：Shilin [1,2]Zhang;Yingjie [1,2]Ma;Sensen [1,3]Huang;Sabry [1,2]S.Youssef;Min [1,2]Qi;Hao [1,2]Wang;Jianke [1,2]Qiu;Jiafeng [1,2]Lei;Rui [1,2]Yang 高影响力作者 机构地区：[1]Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China;[2]School of Materials Science and Engineering, University of Science and Technology of China, Shenyang 110016, China;[3]School of Materials and Engineering & Key Laboratory for Anisotropy and Texture of Materials, Northeastern University, Shenyang 110819, China高影响力机构 出　　处：《Journal of Materials Science & Technology》索引2019年第35卷第8期,共10页高影响力期刊 基　　金：supported by Strategic Priority Research Program of the Chinese Academy of Sciences (XDB06050100);Natural Key Research and Development Program of China (2016YFC0304201, 2016YFC0304206);Natural Science Foundation of China (No. 51871225) 摘　　要：The heat-affected zone(HAZ) of electron beam welded(EBW) joint normally undergoes a unique heat-treating process consisting of rapid temperature rising and dropping stages, resulting in temperature-gradient in HAZ as a function of the distance to fusion zone(FZ). In the current work,microstructure, elements distribution and crystallographic orientation of three parts(near base material(BM) zone, mid-HAZ and near-FZ) in the HAZ of Ti-6Al-4V alloy were systematically investigated. The microstructure observation revealed that the microstructural variation from near-BM to near-FZ included the reduction of primary α(αp) grains, the increase of transformed β structure(βt) and the formation of various α structures. The rim-α, dendritic α and abnormal secondary α(αs) colonies formed in the mid-HAZ, while the 'ghost' structures grew in the near-FZ respectively. The electron probe microanalyzer(EPMA) and electron back-scattered diffraction(EBSD) technologies were employed to evaluate the elements diffusion and texture evolution during the unique thermal process of welding. The formation of the various α structures in the HAZ were discussed based on the EPMA and EBSD results. Finally, the nanoindentation hardness of 'ghost' structures was presented and compared with nearby βt regions. 关 键 词：TI-6AL-4V Electron beam welding HAZ Element distribution TEXTURE
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