超薄奥氏体不锈钢电阻点钎焊接头组织与性能  

MICROSTRUCTURE AND PROPERTIES OF RESISTANCE SPOT BRAZING JOINT OF ULTRA-THIN AUSTENITIC STAINLESS STEEL

作　　者：唐论 余圣甫[1] 王杰 TANG Lun;YU ShengFu;WANG Jie(State Key Laboratory of Material Processing and Die&Mould Technology,Huazhong University of Science and Technology,Wuhan 430074,China;Nantong Customs of the People’s Republic of China,Nantong 226006,China)

机构地区：[1]华中科技大学材料成形与模具技术国家重点实验室,武汉430074 [2]中华人民共和国南通海关,南通226006

出　　处：《机械强度》2022年第4期801-807,共7页Journal of Mechanical Strength

基　　金：湖北省重点研发计划项目(2020BAB050)资助。

摘　　要：采用电阻点钎焊工艺进行了以BNi⁃2为中间层的0.1 mm厚SUS304不锈钢封装试验,分析了工艺参数对电阻点钎焊接头微观组织和力学性能的影响,确定了接头区域元素分布及物相组成,并验证了接头的气密性。结果表明:电阻点钎焊接头由钎缝区、热机械影响区和母材组成;随着焊接电流和电极压力的增大,钎缝区厚度减小、热机械影响区动态再结晶程度增大;高的冷却速率抑制了钎缝与母材间的元素扩散,钎缝区的物相为镍基固溶体及弥散分布的Cr_(2)B、Ni_(3)B细小质点,接头的最大抗剪力为118.3 N;封装元件最大承载气压达到0.53 MPa,表明了超薄奥氏体不锈钢电阻点钎焊接头具有优异的气密性。The encapsulation test of 0.1 mm thick SUS304 stainless steel with BNi-2 as the intermediate layer was carried out by using resistance spot brazing technology.The influence of technological parameters on the microstructure and mechanical properties of resistance spot brazing joint was analyzed,the element distribution and phase composition in the joint area were determined,and the air tightness of the joint was verified.The results show that the resistance spot brazing joint is composed of the brazing zone,the thermomechanical affected zone and the base material;With the increase of welding current and electrode pressure,the thickness of the brazing zone decreases and the dynamic recrystallization degree of the thermomechanical affected zone increases;The high cooling rate inhibits the element diffusion between the brazing joint and the base metal,the phases of the brazing joint are nickel based solid solution and dispersively distributed fine Cr_(2)B and Ni_(3)B particles,the maximum shear resistance of the joint is 118.3 N;The maximum load pressure of the package element reaches 0.53 MPa,which indicates that the resistance spot brazing joint of ultra-thin austenitic stainless steel has excellent air tightness.

关 键 词：电阻点钎焊 SUS304不锈钢 微观组织 力学性能 气密性 

分 类 号：TG438.2[金属学及工艺—焊接] TG454