Effect of Welding Wire Composition on Microstructure Inhomogeneity of Domestic Invar Alloy GTAW Joint
CHENG Lihong1, ZHOU Yuqi1, WANG Jianfeng1, LI Zhu2, MU Zhan2, ZHAN Xiaohong1,*
1 College of Materials Science and Technology, Nanjing University of Aeronautics and Astronautics, Nanjing 211106, China 2 Xi'an Gangyan Special Alloy Co., Ltd., Xi'an 710000, China
Abstract: The influence of wire composition on the microstructure varieties of joints was studied by using gas tungsten arc welding (GTAW) process. Results showed that the microstructure of welded joint obtained by using the three welding wires are featured coarse columnar crystals grown perpendicular to the fusion lines and equiaxed crystals in the middle of weld, cellular subcrystals in equiaxed crystals are remarkably refined.There was a large differences in the type, morphology and distribution position of precipitated phases formed when using welding wires of different composition.When using the welding wire with 0.40%Ti, more regular bulk particles were precipitated at the grain boundary, and if useing the welding wire with 1.42%Nb, a white chain or columnar continuous phase were precipitated at the subgrain boundary, which not only enabled the core of heterogeneous nucleation or the particle that nails the grain boundary to refine the grain, but also hindered dislocation motion to strengthen the welded joint.The tensile test results showed that the tensile strength of the joints with 0.40%Ti addtion or 1.42%Nb addtion to the welding wire reached 638.2MPa or 653.5 MPa respectively, which are 60.6% and 64.4% higher than that of conventional welding wire.When the specimen was welded with the welding wire that with Nb (1.42%Nb) addition, the size depth of the fracture ligament increased, and the joint fracture mode changed from brittle fracture to ductile fracture, indicating that Nb plays a significant role in the microstructure refinement and mechanical properties improvement of Invar alloy joints.
通讯作者:
* 占小红,南京航空航天大学材料科学与技术学院教授、博士研究生导师。2008年哈尔滨工业大学焊接专业博士毕业,2008年7月加入南京航空航天大学工作至今。目前主要从事轻合金激光焊接相关方向的工艺、建模仿真、装备等领域的研究工作。发表SCI 论文140余篇,申请专利90余项。其中,在Materials & Design、Journal of Materials Processing Technology、Journal of Crystal Growth、Science and Technology of Welding and Joining、Mate-rials Science and Engineering A等期刊发表论文多篇。xiaohongzhan_nuaa@126.com
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2024, Vol. 38 
