Mechanical Properties of Resistance Spot Welded Components of High Strength Austenitic Stainless Steel  

作　　者：Wei Liu Hailong Fan Xiangzhong Guo Zhihong Huang Xiaohui Han 

机构地区：[1]School of Mechanical,Electronic and Control Engineering,Beijing Jiaotong University [2]CRRC Nanjing Puzhen Co.,Ltd. [3]CRRC Qingdao Sifang Co.,Ltd.

出　　处：《Journal of Materials Science & Technology》2016年第6期561-565,共5页材料科学技术（英文版）

基　　金：funded by the Scientific Research and Development Projects of China Railway Corporation(2011J105-B)

摘　　要：Resistance multi-spot welding （MSW） in column, triangle and tetragonal symmetry arrangements was prepared using cold-rolled 301L high-strength sheets, and their static and fatigue properties were in- vestigated. The effects of spot welds on the fracture strengths and fatigue limits were discussed. The results show that the static strengths can be estimated using an inherent linear relationship formula of the load versus the welding area. It was based on the 28%-33% volume fraction of α′ martensite induced at the interfacial spot weld fracture because of the failure deformation. The fatigue limits of the MSW nonlin- early increase with the number of spot welds. The arrangement of spot welds in the MSW significantly affects the average fatigue limit of each spot weld; its 26% maximum reduction occurred in the triangle, and the interaction stress between spot welds led to its 18% reduction in the tetragonal symmetry. The calculated fatigue stress of all MSW loadings with their mean fatigue limits was 230-270 MPa.Resistance multi-spot welding （MSW） in column, triangle and tetragonal symmetry arrangements was prepared using cold-rolled 301L high-strength sheets, and their static and fatigue properties were in- vestigated. The effects of spot welds on the fracture strengths and fatigue limits were discussed. The results show that the static strengths can be estimated using an inherent linear relationship formula of the load versus the welding area. It was based on the 28%-33% volume fraction of α′ martensite induced at the interfacial spot weld fracture because of the failure deformation. The fatigue limits of the MSW nonlin- early increase with the number of spot welds. The arrangement of spot welds in the MSW significantly affects the average fatigue limit of each spot weld; its 26% maximum reduction occurred in the triangle, and the interaction stress between spot welds led to its 18% reduction in the tetragonal symmetry. The calculated fatigue stress of all MSW loadings with their mean fatigue limits was 230-270 MPa.

关 键 词：301L-HT sheet Multi-spot welding Spot weld arrangement Static-strength prediction Fatigue limit 

分 类 号：TG142.71[一般工业技术—材料科学与工程] TG453.9[金属学及工艺—金属材料]