TA1中厚板电子束焊接组织性能及接头强化原因分析  

Microstructure and properties of electron beam welded TA1 medium plate and analysis of joint strengthening

作　　者：白威[1] 李大东[1] 董雪娇 陈容[1] Bai Wei;Li Dadong;Dong Xuejiao;Chen Rong(Pangang Group Research Institute Co.,Ltd.,State Key Laboratory of Vanadium and Titanium Resources Comprehensive Utilization,Panzhihua 617000,Sichuan,China)

机构地区：[1]攀钢集团研究院有限公司,钒钛资源综合利用国家重点实验室,四川攀枝花617000

出　　处：《钢铁钒钛》2021年第6期171-177,共7页Iron Steel Vanadium Titanium

摘　　要：采用真空电子束焊对30 mm厚TA1工业纯钛试板开展焊接试验,结合光学金相显微镜(OM)、维氏硬度、拉伸试验及电子背散射衍射(EBSD)对接头进行宏微观组织性能检验,分析电子束焊接过程对TA1材料微观组织与力学性能的影响及接头强化原因。结果表明:电子束焊接热循环过程使TA1母材至焊缝组织由等轴α向锯齿α转变;焊缝及热影响区的强度、硬度均高于母材;接头性能得到强化与锯齿α及针状α马氏体对硬度的提升作用、焊缝及热影响区内细小的锯齿状α晶粒以及微细孪晶对焊接组织的细化作用有关。Electron beam welding was used to weld 30 mm thick TA1 pure titanium plates.Combined with optical microscope(OM)and electron backscatter diffraction(EBSD),the microstructure,Vickers hardness and tensile test of the joint were carried out.The influence of welding process on microstructure and mechanical properties of TA1 material and the strengthening reason of the joint were analyzed.The results show that the microstructure from TA1 base metal to weld metal changes from equiaxedαto serratedα.The strength and hardness of welding seam and the heat affected zone are higher than the base metal.The strengthening of the joint properties is related to the increasing effect of serratedαand acicularαmartensite on the hardness,the existence of a large number of serratedαlower than the grain size of the base metal in the weld seam and heat-affected zone,and the refining effect of micro-twinning on the welding microstructure.

关 键 词：TA1中厚板 电子束焊接 微观组织 力学性能 

分 类 号：TF823[冶金工程—有色金属冶金] TG456.3[金属学及工艺—焊接]