航空用TC18钛合金电子束焊接温度与残余应力场研究  

Numerical simulation of electron beam welding of TC18 titanium alloy

作　　者：蒋红元 张昌明[1] JIANG Hong-yuan;ZHANG Chang-ming(School of Mechanical Engineering,Shaanxi University of Technology,Hanzhong 723000,China)

机构地区：[1]陕西理工大学机械工程学院,陕西汉中723000

出　　处：《陕西理工大学学报（自然科学版）》2021年第6期1-6,共6页Journal of Shaanxi University of Technology:Natural Science Edition

基　　金：陕西省重点研发计划项目(2020GY-121)。

摘　　要：采用组合热源模型,建立了4 mm厚TC18钛合金平板电子束焊接温度场和应力场的数值模型。通过间接耦合计算,得到温度和应力的分布规律。仿真结果表明,TC18电子束焊接温度场类似于拉长的椭圆形。在电子束直接作用区域温度最高,随着与焊缝中心距离增大,温度随之降低。电子束焊接残余应力主要以纵向残余应力为主,集中在焊缝中部及其附近区域,横向残余应力较小。焊缝及附近塑性区的纵向和横向收缩较小。A numerical model of temperature field and stress field in electron beam welding(EBW)of 4 mm thick TC18 titanium alloy plate was established by using the combined heat source model.Through indirect coupling calculation,the distribution law of temperature and stress is obtained.The results show that the temperature field of TC18 electron beam welding is similar to the elongated ellipse,and the temperature is the highest in the region directly affected by electron beam,and decreases with the increase of distance from the weld center.Electron beam welding residual stress is mainly longitudinal residual stress,concentrated in the middle of the weld and its vicinity,and the transverse residual stress is small.The longitudinal and transverse shrinkage of weld and its adjacent plastic zone is small,and the welding process of segmented welding can be used to reduce the peak stress of longitudinal residual stress.

关 键 词：TC18钛合金 电子束焊接 温度场 纵向残余应力 横向残余应力 

分 类 号：TG456.3[金属学及工艺—焊接]