Super-Ni/NiCr叠层材料与Cr18-Ni8钢真空钎焊接头的组织性能  

Microstructure and properties of vacuum brazed joint between super-Ni/NiCr laminated composite and Cr18-Ni8 steel

作　　者：吴娜[1] 李亚江[1] 王娟[1] 

机构地区：[1]山东大学材料液固结构演变与加工教育部重点实验室,济南250061

出　　处：《焊接学报》2013年第3期41-44,115,共4页Transactions of The China Welding Institution

基　　金：国家自然科学基金资助项目(51175303)

摘　　要：以Ni-Cr-Si-B系非晶钎料作为填充金属,采用真空钎焊技术得到成形良好的Super-Ni/NiCr叠层复合材料与Cr18-Ni8不锈钢接头.通过扫描电镜(SEM)、能谱分析仪(EDS)、显微硬度计对接头的组织性能进行分析.结果表明,钎料在叠层复合材料和Cr18-Ni8不锈钢表面润湿性良好,钎缝由γ-Ni固溶体和Ni3B组成.钎缝与Super-Ni/NiCr叠层复合材料之间发生溶解和扩散,界面不明显;钎缝与Cr18-Ni8不锈钢之间形成由细小硼化物组成的界面.钎焊接头的抗剪强度可达170 MPa,钎缝区呈现台阶状断裂,并带有撕裂特征,有少量韧窝.Vacuum brazing of super-Ni/NiCr laminated composite to Cr18-Ni8 steel was performed using Ni-Cr-Si-B amorphous foil.Microstructure characteristic and shear strength of the brazed joints were investigated by scanning electron microscopy(SEM),energy-dispersive spectroscopy(EDS),microsclerometer and mechanical universal testing machine.The experimental results showed that the Ni-Cr-Si-B amorphous foil exhibited good wettability on super-Ni/NiCr laminated composite.The brazed region consisted of γ-Ni solid solution and Ni3B.Dissolution and diffusion occurred between the filler metal and super-Ni/NiCr laminated composite.An excellent bonding was obtained between them.An interface consisting of fine boride particles formed between the filler metal and Cr18-Ni8 stainless steel.The shear strength of the brazed joint reached 170MPa,and the fracture morphology displayed stepped fracture surface with some dimples and tearing feature in the brazed region.

关 键 词：叠层复合材料 真空钎焊 显微组织 抗剪强度 

分 类 号：TG454[金属学及工艺—焊接]