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张菁丽,辛社伟,周伟,张永强,郭荻子,李倩,毛小南.热处理对Ti650钛合金电子束焊接组织和力学性能的影响[J].稀有金属材料与工程(英文),2021,50(1):299~303.[张菁丽,Xin Shewei,Zhou Wei,Zhang Yongqiang,Guo Dizi,Li Qian and Mao Xiaonan.Effect of Heat Treatments on Microstructure and Property of Electron Beam Weldment of Ti650 Alloy[J].Rare Metal Materials and Engineering,2021,50(1):299~303.]
Effect of Heat Treatments on Microstructure and Property of Electron Beam Weldment of Ti650 Alloy
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Received:January 17, 2020  
DOI:
Key words: Ti650 alloy  electron beam welding  heat treatment  mechanical property
Foundation item:国家自然科学基金
Author NameAffiliation
张菁丽,Xin Shewei,Zhou Wei,Zhang Yongqiang,Guo Dizi,Li Qian and Mao Xiaonan  
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Abstract:
      The effects of post-weld heat treatment on the microstructure and mechanical properties of Ti650 alloy electron beam welding (EBW) samples were studied. The results indicated that metastable martensite α′ is the main phase in the fusion zone of welding seam. During 700℃/2hAC heat-treatment, a phase transition α′→α occurred, and a large number of short aciculate secondary α were precipitated in the fusion zone. After 1010℃/1.5hWC+650℃/2hAC heat treatment, α was obviously coarsened and equiaxed. The microstructure contains the original coarse layer and the secondary short acicular alpha can effectively improve the strength and prevent the crack growth of welded joint. The welded joint has better strength and plasticity under the condition. After subsequent treatment at 700℃/2hAC, some equiaxed alpha can be found gradually precipitated at the grain boundary, resulting in a decrease in strength and plasticity of the grain boundary. In conclusion, 1010℃/1.5hWC+650℃/2hAC is the most suitable post-welding heat treatment for Ti650 EBW welded joint to make the properties of weld and matrix be well matched.