TC4钛合金真空电子束焊温度场及成形性能  

Temperature field and formability of vacuum electron beam welding of TC4 titanium alloy

作　　者：巩鹏飞 李亚 柴斐 陈洪胜 高会良 王文先 GONG Pengfei;LI Ya;CHAI Fei;CHEN Hongsheng;GAO Huiliang;WANG Wenxian(College of Mechanical and Vehicle Engineering,Taiyuan University of Technology,Taiyuan 030024,Shanxi pro.,China;Jinxi Railway Rolling Stock Co.,Ltd.,Taiyuan 030027,Shanxi pro.,China;Key Laboratory of Intelligent Underwater Equipment in Shanxi Province,Taiyuan 030024,Shanxi pro.,China)

机构地区：[1]太原理工大学机械与运载工程学院,山西太原030024 [2]晋西铁路车辆有限责任公司,山西太原030027 [3]智能水下装备山西省重点实验室,山西太原030024

出　　处：《焊接技术》2023年第8期35-41,I0006,共8页Welding Technology

基　　金：山西省重点研发计划;山西省重点研发计划(202102150401003);中央引导地方项目(YDZJSX2022A018)。

摘　　要：为研究TC4钛合金焊接接头的成形性能,采用真空电子束焊方法对TC4钛合金进行焊接。通过Ansys Workbench数值模拟软件对TC4钛合金真空电子束焊过程进行数值模拟,研究了电子束流、加速电压和焊接速度对焊接接头成形性能的影响。研究结果表明,数值模拟结果与试验结果相吻合;随着电子束流、加速电压的增大及焊接速度的减小,焊缝的熔深和熔宽随之增大;焊接接头熔合区晶粒尺寸由上至下(沿深度方向)逐渐减小,熔合区主要由针状马氏体α′相组成;焊接接头相比于母材,抗拉强度提高至103%,塑性降低,延伸率最高达到86%,针状马氏体α′相是导致焊接接头力学性能改变的关键因素。In order to discuss the formability of TC4 titanium alloy welded joints,TC4 titanium alloy was welded by vacuum electron beam welding method.The vacuum electron beam welding process of TC4 titanium alloy was numerically simulated by Ansys Workbench numerical simulation software,and the effects of electron beam current,accelerating voltage and welding speed on the formability of welded joints were studied.The results showed that the numerical simulation results were in agreement with the experimental results.With the increase of electron beam current and accelerating voltage and the decrease of welding speed,the penetration depth and width of weld would increase.The grain size of the bond area of the welded joint decreased gradually from top to bottom(along the depth direction),and the bond area was mainly composed of acicular martensiteα′phase.Compared with the base metal,the tensile strength of welded joint increased to 103%,the plasticity decreased,and the elongation reached up to 86%.The acicular martensiticα′phase was the key factor leading to the change of mechanical properties of welded joint.

关 键 词：真空电子束焊 温度场 成形性能 微观组织 力学性能 

分 类 号：TG442[金属学及工艺—焊接]