| 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1120℃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. |
| 关键词: 叠层复合材料 高温钎焊 显微组织 抗剪强度 |
| DOI： |
| 分类号: |
| 基金项目:国家自然科学基金资助项目(51175303) |
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| Microstructure and shear strength of high-temperature brazed joint of Super-Ni/NiCr laminated composite using Ni-Cr-Si-B filler metal |
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WU Na, LI Yajiang, WANG Juan
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Key Laboratory for Liquid-Solid Structural Evolution and Processing of Materials(Ministry of Education), Shandong University, Jinan 250061, China
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| Abstract: |
| 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,Ni3B,CrB and Ni3Si. The microhardness fluctuated across the brazed region. The microhardness of γ-Ni substrate was 450 MPa and that of Ni3B 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. Ni3B interface formed between the super-Ni and brazed region. The joint fractured through the Ni3B interface. |
| Key words: laminated composite high-temperature brazing microstructure shear strength |
