钎焊温度对316L/AuSi/NiTi接头界面组织与力学性能的影响  

Effect of brazing temperature on interfacial microstructure and mechanical property of 316L/AuSi/NiTi joint

作　　者：陈修凯 曹云飞 卞红 宋晓国[1,2] 姜楠 李明[2] CHEN Xiukai;CAO Yunfei;BIAN Hong;SONG Xiaoguo;JIANG Nan;LI Ming(State Key Laboratory of advanced welding and joining,Harbin Institute of Technology,Harbin,150001,China;Shandong Provincial Key Lab of Special Welding Technology,Harbin Institute of Technology at Weihai,Weihai,264209,China)

机构地区：[1]哈尔滨工业大学,先进焊接与连接国家重点实验室,哈尔滨150001 [2]哈尔滨工业大学(威海),山东省特种焊接技术重点实验室,威海264209

出　　处：《焊接学报》2023年第7期9-15,I0003,共8页Transactions of The China Welding Institution

基　　金：国家自然科学基金青年科学基金资助项目(51905127)。

摘　　要：采用AuSi共晶钎料成功实现了316L不锈钢和NiTi形状记忆合金的连接.使用扫描电子显微镜和能谱仪等分析测试手段对不同钎焊温度下获得的接头界面组织进行了分析.结果表明,316L/AuSi/NiTi接头典型界面微观组织为316L/(Fe,Cr)_(5)Si_(3)/Au(s,s)+Ti_(14)Ni_(49)Si_(37)(+Si)/Ni_(4)Si_(7)Ti_(4)+NiSiTi/NiTi.随着钎焊温度的升高,316L不锈钢侧(Fe,Cr)_(5)Si_(3)层逐渐形成并变厚,NiTi合金侧的NiSiTi层先增厚后减薄,钎缝中的硅含量逐渐减少.剪切试验表明,当钎焊温度为600℃、保温时间为30 min时,钎焊接头的抗剪强度最高为34 MPa.接头的断裂路径分析表明,接头沿钎缝中的固溶体发生断裂.创新点:(1)采用AuSi共晶钎料在低温下实现了316L不锈钢和NiTi形状记忆合金的钎焊连接.(2)探究了钎焊温度对316L/AuSi/NiTi接头界面组织与抗剪强度的影响规律.The NiTi shape memory alloy was successfully brazed with 316L stainless steel by AuSi filler metal.The interfacial microstructures of brazed joints at different temperatures were analyzed by scanning electron microscope and energy dispersive spectrometer.The results showed that the typical interfacial microstructure of 316L/AuSi/NiTi joint was 316L/(Fe,Cr)_(5)Si_(3)/Au(s,s)+Ti_(14)Ni_(49)Si_(37)(+Si)/Ni_(4)Si_(7)Ti_(4)+NiSiTi/NiTi.With the rising of temperature,the(Fe,Cr)_(5)Si_(3)layer on 316L stainless steel side was gradually formed and grew thicker,while the NiSiTi layer on NiTi alloy side was thick at first and then became thinner.Meanwhile,the content of Si in the braze seam decreased gradually.The shear test indicated that the brazed joint at 600℃for 30 min exhibited the highest shear strength of 34 MPa.The path of fracture analysis showed that the joint tended to fracture along the solid solution in the brazing seam.Highlights:(1)The brazing of 316L stainless steel and NiTi shape memory alloys was achieved by AuSi filler metal under a low temperature.(2)The effect of brazing temperature on interfacial microstructure and shear strength was investigated.

关 键 词：镍钛形状记忆合金 不锈钢 钎焊 界面组织 力学性能 

分 类 号：TG454[金属学及工艺—焊接]