Super-Ni/NiCr叠层材料Ni-Cr-Si-B高温钎焊接头的组织特征及抗剪强度  

Microstructure and shear strength of high-temperature brazed joint of Super-Ni/NiCr laminated composite using Ni-Cr-Si-B filler metal

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》2014年第1期9-12,36,共5页Transactions of The China Welding Institution

基　　金：国家自然科学基金资助项目(51175303)

摘　　要：采用Ni-Cr-Si-B高温钎料对Super-Ni/NiCr叠层复合材料和Cr18-Ni8不锈钢进行真空钎焊,并分析钎焊接头的显微组织及物相组成、显微硬度、抗剪强度及断口形貌.结果表明,钎缝主要由γ-Ni固溶体、Ni3B、CrB和Ni3Si组成;钎缝的显微硬度波动较大,γ-Ni基体显微硬度为450 MPa,Ni3B的显微硬度最高650 MPa.钎焊温度升高至1 120℃时,接头的抗剪强度最高可达158 MPa,NiCr基层钎缝区呈脆性断裂,出现撕裂韧窝.钎缝区与Super-Ni复层之间形成Ni3B界面,Super-Ni复层钎缝区断裂于Ni3B界面.Super-Ni /NiCr laminated composite and Cr18-Ni8 steel were brazed with Ni-Cr-Si-B high-temperature brazing filler metal. The microstructure, phase constitution, shear strength and fracture morphology were analyzed. The brazed region consisted of γ-Ni solid solution,Ni 3 B,CrB and Ni 3 Si. The microhardness fluctuated across the brazed region. The microhardness of γ-Ni substrate was 450 MPa and that of Ni 3 B was 650 MPa. The shear strength of the joint increased to 158 MPa as the brazing temperature increased to 1 120 ℃. The fracture surface displayed brittle features with some shearing dimples. Ni 3 B interface formed between the super-Ni and brazed region. The joint fractured through the Ni 3 B interface.

关 键 词：叠层复合材料 高温钎焊 显微组织 抗剪强度 

分 类 号：TG146.1[一般工业技术—材料科学与工程]