稀土合金化对钛合金激光焊接接头超塑变形行为的影响  

Effect of rare earth alloying on superplastic deformation behavior of titanium alloy laser welded joint

作　　者：薛行雁 程东海[2] 张冠星 常云峰 刘付丽 XUE Hang-yan;CHENG Dong-hai;ZHANG Guan-xing;CHANG Yun-feng;LIU Fu-li(State Key Laboratory of Advanced Brazing Filler Metals&Technology,Zhengzhou Research Institute of Mechanical Engineering Co Ltd,Zhengzhou 450001,China;Aviation Manufacturing and Engineering College,Nanchang Hangkong University,Nanchang 330063,China)

机构地区：[1]郑州机械研究所有限公司新型钎焊材料与技术国家重点实验室,河南郑州450001 [2]南昌航空大学航空制造工程学院,江西南昌330063

出　　处：《材料热处理学报》2024年第8期227-234,共8页Transactions of Materials and Heat Treatment

基　　金：国家重点研发计划(2022YFB3402204)。

摘　　要：通过在TC4钛合金激光焊缝中添加Yb_(2)O_(3),以提高接头超塑性变形均匀性,观察Yb_(2)O_(3)对焊缝超塑性变形前后组织的影响,并以等轴化系数表征组织在超塑变形中的演变进程。结果表明,Yb_(2)O_(3)的加入能够提高焊缝的超塑性能,从而提高接头的变形均匀性。加入Yb_(2)O_(3)后能够降低焊缝原始β晶粒尺寸,并推动焊缝针状组织的等轴化进程,促进超塑性变形。随着Yb_(2)O_(3)含量的升高,其作用效果呈现先增加后减小的趋势,当Yb_(2)O_(3)含量为6 mass%时效果最佳,焊缝伸长率达到最大54.8%,变形协调系数K最大为0.21;β晶粒尺寸最小为308μm,等轴化系数J达到最大0.26。By adding Yb_(2)O_(3) to the TC4 titanium alloy laser weld to improve the uniformity of superplastic deformation of the joint,the effect of Yb_(2)O_(3) on microstructure of the weld before and after superplastic deformation was observed,and the evolution process of the microstructure during superplastic deformation was characterized by equiaxed coefficient.The results show that the addition of Yb_(2)O_(3) can improve the superplasticity of the weld,thereby improving the deformation uniformity of the joint.The addition of Yb_(2)O_(3) can reduce the originalβgrain size of the weld,promote the equiaxed process of the acicular structure of the weld,and promote the superplastic deformation.As the Yb_(2)O_(3) content increases,its effect shows a trend of first increasing and then decreasing.When the Yb_(2)O_(3) content is 6 mass%,the effect is the best,the elongation of the weld reaches the maximum of 54.8%,the deformation coordination coefficient K reaches the maximum of 0.21,theβgrain size reaches the minimum of 308μm,and the equiaxed coefficient J reaches the maximum of 0.26.

关 键 词：钛合金 Yb_(2)O_(3) 超塑性变形 变形协调系数K 等轴化系数J 

分 类 号：TG456.7[金属学及工艺—焊接]