Lap-Shear Performance of Weld-Bonded Mg Alloy and Austenitic Stainless Steel in Three-Sheet Stack-Up  

作　　者：Sunusi Marwana Manladan Mukhtar Fatihu Hamza Singh Ramesh Zhen Luo 

机构地区：[1]School of Materials Science and Engineering,Tianjin University,Tianjin 300350,China [2]Department of Mechanical Engineering,Faculty of Engineering,Bayero University,Kano 3011,Nigeria [3]Department of Mechanical Engineering,College of Engineering,Prince Sattam bin Abdulaziz University,11942 Alkharj,Saudi Arabia [4]Department of Mechanical Engineering,Faculty of Engineering,University of Malaya,50603 Kuala Lumpur,Malaysia

出　　处：《Chinese Journal of Mechanical Engineering》2024年第4期342-353,共12页中国机械工程学报（英文版）

基　　金：Supported by National Natural Science Foundation of China (Grant No.52075378);Prince Sattam Bin Abdulaziz University of Saudi Arabia (Grant No.PSAU/2024/R/1445)。

摘　　要：With the growing interest in utilizing Mg and austenitic stainless steel(ASS)in the automotive sector,joining them together in three-sheet configuration is inevitable.However,achieving this task presents considerable challenges due to the large differences in their physical,metallurgical and mechanical properties.To overcome these challenges,the feasibility of using weld-bonding to join Mg alloy/ASS/ASS was investigated.The nugget formation,interface characteristics,microstructure and mechanical properties of the joints were investigated.The results show that the connection between the Mg alloy and upper ASS was achieved through the combined effect of the cured adhesive and weld-brazing in the weld zone.On the other hand,a metallurgical bond was formed at the ASS/ASS interface.The Mg nugget microstructure exhibited fine columar grains composed predominantly of primaryα-Mg grains along with a eutectic mixture ofα-Mg andβ-Mg17Al12.The nugget formed at the ASS/ASS interface consisted largely of columnar grains of austenite,with some equiaxed dendritic grains formed at the centerline of the joint.The weld-bonded joints exhibited an average peak load and energy absorption of about 8.5 kN and 17 J,respectively(the conventional RSW joints failed with minimal or no load application).The failure mode of the joints changed with increasing welding current from interfacial failure via the Mg nugget/upper ASS interface to partial interfacial failure(part of the Mg nugget was pulled out of the Mg sheet).Both failure modes were accompanied by cohesive failure in the adhesive zone.

关 键 词：Weld-bonding Resistance spot welding Austenitic stainless steel Mg alloy Failure mode 

分 类 号：TG455[金属学及工艺—焊接]