TIG连接异种工艺TA15合金的微观组织与力学性能  

Microstructure and mechanical property of TA15 alloy by TIG jointing dissimilar process

作　　者：肖洪跃 杨光 王超 吴斌 XIAO Hongyue;YANG Guang;WANG Chao;WU Bin(College of Mechanical and Electrical Engineering,Shenyang Aerospace University,Shenyang 110136,China;Key Laboratory of Fundamental Science for National Defense of Aeronautical Digital Manufacturing Process,Shenyang Aerospace University,Shenyang 110136,China;Academy of Aeronautics and Astronautics,Tsinghua University,Beijing 100084,China)

机构地区：[1]沈阳航空航天大学机电工程学院,沈阳110136 [2]沈阳航空航天大学航空制造工艺数字化国防重点学科实验室,沈阳110136 [3]清华大学航天航空学院,北京100084

出　　处：《沈阳航空航天大学学报》2024年第6期42-49,共8页Journal of Shenyang Aerospace University

基　　金：国家重点研发计划项目(项目编号:2021YFC2801904)。

摘　　要：为了满足大型构件连接需求,以TA15丝材为原料,采用钨极惰性气体保护焊(tungsten inert gas,TIG)对激光沉积制造(laser deposition manufacturing,LDM)和热等静压(hot isostatic pressing,HIP)制备的TA15母材进行连接。结果表明,连接试样不同区域组织存在差异,其中HIP母材微观组织为等轴晶,晶粒内部为双态组织;HIP母材热影响区A(heat affected zone A,HAZ-A)呈现等轴晶;TIG连接区呈现β柱状晶,晶粒内部为细小网篮组织;LDM区呈现β柱状晶,晶粒内部的网篮组织较TIG连接区粗大;LDM母材热影响区B(heat affected zone B,HAZ-B)晶粒形状仍为柱状晶。连接试样的室温抗拉强度和延伸率分别达到了1046.3±13.7 MPa和6.2%±0.6%。与母材相比,连接试样的抗拉强度提高,塑性下降。连接试样的断裂位置为HAZ-B,断裂机制属于半解理半韧性断裂。In order to meet the jointing requirements of large-scale components,TA15 wire was used as raw material to join TA15 base metal prepared by laser deposition manufacturing(LDM)and hot isostatic pressing(HIP)with tungsten inert gas(TIG).The results show that there are differences in the microstructure of different regions of the jointing specimens.The microstructure of the HIP base metal is equiaxed grains,and the internal structure of the grain is bimodal structure.The heat affected zone A(HAZ-A)of HIP base metal presents equiaxed grains.The TIG jointing zone presentsβcolumnar grains,and the intracrystalline is fine basketweave structure.The LDM zone presentsβcolumnar grains,and the basketweave structure inside the grains is coarser than that in the TIG jointing zone.The grain shape of heat affected zone B(HAZ-B)of LDM base metal is still columnar grains.The tensile strength and elongation of the jointed specimens at room temperature are 1046.3±13.7 MPa and 6.2%±0.6%respectively.Compared with the base metal,the tensile strength of the jointed specimens increases and the plasticity decreases.The fracture position of the jointing specimens is HAZ-B,and the fracture mechanism belongs to semi-cleavage and semi-ductile fracture.

关 键 词：TA15合金 钨极惰性气体保护焊 激光沉积制造 热等静压 微观组织 力学性能 

分 类 号：TG444[金属学及工艺—焊接]