金属铪真空电子束焊接工艺及组织性能研究  

Study on Welding Process and Microstructure and Properties of Vacuum Electron Beam Welding of Hafnium

作　　者：杨灿湘[1] 张超 周猛兵 王军[1] 李博[1] 白力文 陈高詹 魏连峰[1] Yang Canxiang;Zhang Chao;Zhou Mengbing;Wang Jun;Li Bo;Bai Liwen;Chen Gaozhan;Wei Lianfeng(Fourth Institute of Nuclear Power Institute of China,Chengdu 610213,China)

机构地区：[1]中国核动力研究设计院第四研究所,四川成都610213

出　　处：《钛工业进展》2023年第5期30-34,共5页Titanium Industry Progress

摘　　要：采用真空电子束焊接工艺焊接金属铪板材,研究了金属铪焊后的微观组织和力学性能。结果表明,金属铪在焊接电压为60 kV、焊接束流为36 mA/40 mA、焊接速度为1000 mm/min的工艺条件下,可以实现金属铪的稳定焊接,获得无内部缺陷的焊接接头。金属铪组织为晶粒大小一致、晶界清晰的等轴晶组织,晶粒度达到10级。经真空电子束焊接后,其焊缝区的晶粒明显长大,表现为不均匀分布的、粗大的树枝晶组织,并存在少量的退火孪晶组织。由于焊缝区域晶粒粗化及树枝晶的形成,金属铪真空电子束焊接接头的拉伸性能显著低于母材,断后伸长率仅约为母材的50%。同时,金属铪焊缝拉伸断口形貌呈现光滑的解理台阶、撕裂痕、裂纹等解理断裂特征,并伴有河流状花样,为脆性断裂。The microstructure and mechanical properties of hafnium plate welded by vacuum electron beam welding were studied.The results indicate that stable welding of metal hafnium and welding joints without any internal defects can be achieved under the process conditions of welding voltage of 60 kV,welding beam current of 36 mA/40 mA,and welding speed of 1000 mm/min.The microstructure of hafnium is equiaxed grain structure with uniform grain size and clear grain boundaries.And the grain size reaches 10 grades.After vacuum electron beam welding,the grain size of the weld zone has grown obviously,showing uneven distribution and coarse dendrite structure,and there is a small amount of annealing twin structure.Due to the formation of dendrite and grain coarsening in the weld zone,the tensile properties of vacuum electron beam welding joint of hafnium are significantly lower than that of the base metal.The elongation after fracture is only about 50%of the base metal.At the same time,the tensile fracture morphology of the weld shows obviously cleavage fracture characteristics such as smooth cleavage steps,tear marks,cracks and river-like pattern,which are brittle fractures.

关 键 词：金属铪 真空电子束焊接 微观组织 力学性能 

分 类 号：TG146.414[一般工业技术—材料科学与工程]