摘要
采用电子束焊接TA12钛合金薄板焊缝表面成形良好,焊缝区以马氏体组织为主,细小的稀土相呈均匀弥散分布状态;随着距焊缝距离的增加,稀土相尺寸逐渐增大,数量逐渐减少,并逐渐趋于球形,沿接头呈一定的规律性分布。小孔法残余应力测试结果表明,垂直于焊缝方向残余应力以纵向应力主,应力呈梯度分布,横向应力较低;焊缝区为纵向拉应力区,应力峰值低于其屈服强度,横向应力为较小的压应力;沿焊缝试板中心区(±20 mm范围内)焊接残余应力分布趋于稳定。
Weld configuration of TA12 titanium alloy is very good for electron beam welding(EBW).The main microstructure of weld is martensite,and the tiny rare earth rich phases is dispersedly distributed in the weld zone,and dimension whose configuration changes disciplinary along the joint.By hole drilling method measuring weld residual stresses,the results show that longitudinal stresses are higher than transverse stress,which present gradient distribution along the vertical direction of the weld.In the weld all the longitudinal residual stresses are tensile stresses,and whose peak stresses are lower than yield stresses,while the transverse stresses are very low pressure stresses.Along the weld direction in the central of the plate the residual stresses distributing are approximate equal.
出处
《焊接学报》
EI
CAS
CSCD
北大核心
2007年第2期82-84,共3页
Transactions of The China Welding Institution
关键词
TA12钛合金
电子束焊接
稀土相
残杂应力
TA12 titanium alloy
electron beam welding
rare earth phase
residual stress
