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梁运兴,王龙祥,魏志坚,徐平伟,梁益龙,梁宇.热变形对TA19闪光焊接组织均匀化的影响[J].稀有金属材料与工程(英文),2020,49(5):1757~1765.[Yun-xing Liang,Long-xiang Wang,Zhi-jian Wei,Ping-wei Xu,Yi-long Liang and Yu Liang.Effect of hot deformation on microstructure homogenization of flash welded TA19 alloy[J].Rare Metal Materials and Engineering,2020,49(5):1757~1765.]
Effect of hot deformation on microstructure homogenization of flash welded TA19 alloy
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Received:March 18, 2019  Revised:April 25, 2019
Key words: Near α titanium alloy  Flash welding  Hot deformation  Homogenization of microstructure
Foundation item:国家自然科学基金资助(项目号51761003)
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Yun-xing Liang,Long-xiang Wang,Zhi-jian Wei,Ping-wei Xu,Yi-long Liang and Yu Liang  
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      In order to eliminate the microstructure inhomogeneity of TA19 flash welding joint and improve the comprehensive properties of TA19 flash welding joint. Use Gleeble3500 thermal simulation testing machine on TA19 flash welding head in deformation temperature 900~ 980 ℃, the deformation were 30%, 60%, deformation rate of 0.01 ~ 1 s- 1 for isothermal constant rate under the condition of hot compression test, as to research in welding joint organization under different deformation parameters change characteristics. The experimental results showed that the rheological stress curve of the welded specimen showed a dynamic softening trend during the compression process, and the recovery and recrystallization of the flaked phase were sufficient under the condition of low deformation rate, which promoted the increase of its width and size, and the wedge of phase resulted in the disconnection of the flaked phase. With the increase of deformation amount and deformation temperature, under the action of dynamic recrystallization and element diffusion, the equiaxial ratio of sheet increases gradually. In the process of deformation, residual phases were broken and some mo-rich particles were distributed on the phase matrix. In the subsequent heat treatment process, Mo rich particles on the matrix were dissolved back into phase, which was grown to complete the segmentation of the phase, which was further axialized by static recrystallization. Flash welding specimens under 980 ℃, deformation rate 0.01 s- 1, after 60% deformation under deformation, by 930 ℃ for 1 h + 590 ℃ for 4 h air cooling annealing treatment, can fully realize the weld microstructure of transition such as axis, heat treatment after welding joint organization is given priority to with shaft such as organization, organization uniformity obviously improved.