Ultrasonic vibration assisted tungsten inert gas welding of dissimilar metals 316L and L415  

作　　者：Hong-xia Lan Xiu-fang Gong Sen-feng Zhang Liang Wang Bin Wang Li-ping Nie 

机构地区：[1]School of New Energy and Materials,Southwest Petroleum University,Chengdu 610500,China [2]State Key Laboratory of Long-life High Temperature Materials,Dong Fang Turbine Co.,Ltd.,Deyang 618000,China [3]China National Erzhong Group Deyang Wanhang Die Forging Co.,Ltd.,Deyang 618000,China [4]School of Engineering,Southwest Petroleum University,Nanchong 637800,China

出　　处：《International Journal of Minerals,Metallurgy and Materials》2020年第7期943-953,共11页矿物冶金与材料学报（英文版）

基　　金：financially supported by the Technology Project of Nanchong and Southwest Petroleum University(SWPU)Cooperation(No.18SXHZ0032)。

摘　　要：Ultrasonic vibration assisted tungsten inert gas welding was applied to joining stainless steel 316 L and low alloy high strength steel L415.The effect of ultrasonic vibration on the microstructure and mechanical properties of a dissimilar metal welded joint of 316 L and L415 was systematically investigated.The microstructures of both heat affected zones of L415 and weld metal were substantially refined,and the clusters ofδferrite in traditional tungsten inert gas(TIG)weld were changed to a dispersive distribution via the ultrasonic vibration.The ultrasonic vibration promoted the uniform distribution of elements and decreased the micro-segregation tendency in the weld.With the application of ultrasonic vibration,the average tensile strength and elongation of the joint was improved from 613 to 650 MPa and from 16.15%to31.54%,respectively.The content ofΣ3 grain boundaries around the fusion line zone is higher and the distribution is more uniform in the ultrasonic vibration assisted welded joint compared with the traditional one,indicating an excellent weld metal crack resistance.

关 键 词：ultrasonic vibration dissimilar metal welding MICROSTRUCTURE mechanical properties MICRO-SEGREGATION electron backscatter diffraction 

分 类 号：TG444.74[金属学及工艺—焊接]