摘要
利用MSC.Marc有限元分析软件,在激光焊接和TIG焊接温度场结果的基础上,对IN738高温合金薄板的焊接过程进行了数值模拟,分析了激光焊接和TIG焊接残余应力和塑性应变的分布规律,并进行了焊接试验验证,对焊接温度场和残余应力场进行了测定。结果表明,激光焊接的残余应力峰值高于TIG焊接残余应力峰值,在焊缝中心线和热影响区,激光焊接的纵向残余应力高于TIG焊接的纵向残余应力,激光焊接的拉应力区比TIG焊接的窄,塑性区宽度较TIG焊接的塑性变形区小,且塑性应变值也较低;激光焊接与TIG焊接计算得到的温度场、残余应力场与试验测得的温度场、残余应力场规律基本一致,只在焊缝处横向残余应力场存在较大的差异。
The IN738 superalloy laser welding and TIG welding were analyzed by 3D finite element analysis method,and the effects of different welding procedure on the residual stress and plastic strain were analyzed.To verify the accuracy of the simulated results,the temperature field and residual stress field were measured during welding test.The results indicate that the maximum residual stress of laser welding is higher than that of TIG welding.In the weld centerline and heat affected zone,the longitudinal residual stress of laser welding is the higher than that of TIG welding,and the tensile stress region of laser welding is the narrower than that of TIG welding.Compared to TIG welding,the plastic deformation zone width of laser welding is the smaller,and the plastic strain value is relatively lower.The calculated temperature field and residual stress field of laser welding and TIG welding are basically consistent with the measured ones,and only at the weld,there is some difference in lateral residual stress.
作者
南晴
肖俊峰
唐文书
高松
高斯峰
李永君
张炯
Nan Qing;Xiao Junfeng;Tang Wenshu;Gao Song;Gao Sifeng;Li Yongjun;Zhang Jiong(Xi’an Thermal Power Research Institute Co.,Ltd.)
出处
《特种铸造及有色合金》
CAS
北大核心
2019年第9期960-963,共4页
Special Casting & Nonferrous Alloys
基金
华能集团总部科技资助项目(HNKJ18-H11)
