CuMnNiCo钎料钎焊MGH956合金接头组织及力学性能研究  

Microstructure and Mechanical Property of MGH956 Superalloy Joint Brazed with CuMnNiCo Filler Metal

作　　者：李小强[1] 敖敬培[1] 李子阳[1] 李力[1] 屈盛官[1] 

机构地区：[1]华南理工大学国家金属材料近净成形工程技术研究中心,广州510640

出　　处：《材料工程》2015年第5期21-26,共6页Journal of Materials Engineering

摘　　要：采用自制的CuMnNiCo钎料对氧化物弥散强化（ODS）合金MGH956进行钎焊实验,分析了钎焊过程中各种组织的形成过程,研究了不同的钎焊温度对接头组织和性能的影响.结果表明：在1000～1050℃保温20min工艺下钎焊MGH956合金,均可获得良好的钎焊成形效果,钎焊接头由钎缝中心区的Cu-Mn基固溶体和两侧扩散反应区的Fe-Mn基固溶体组成,并含有三种不同的化合物相.钎焊温度为1030℃和1050℃时,接头的室温拉伸断裂发生在钎缝中心处,断口主要呈沿晶脆性断裂特征.钎焊温度的提高使沿晶界分布的脆性（Mn,Ni）-Si相减少,有利于改善钎焊接头强度,钎焊接头的室温抗拉强度最高可达到母材强度的75％.CuMnNiCo filler metal was developed to braze MGH956 oxide dispersion strengthened （ODS） superalloy. The microstructural evolution was analyzed during brazing. The effects of differ- ent brazing temperatures on microstructures and properties of the joints were investigated. The results show that sound joints can be obtained at 1000-1050℃ for 20min. The brazing joints consist of Cu-Mn based solid solution in the central zone of brazed seam and Fe-Mn based solid solution at the diffusion reaction zone of both sides of brazed seam, with formation of three different compounds. When brazed at 1030℃/1050℃, the room temperature （RT） tensile fracture of the joints occurs at the center of seam, exhibits mainly the intergranular brittle fracture feature. By increasing the brazing temperature to reduce （Mn,Ni）-Si brittle phase distributed along the grain boundary, the strength of brazed joints can be improved. The RT tensile strength of joint reaches up to about 75% of the base material.

关 键 词：ODS合金 钎焊 铜基钎料 接头组织 

分 类 号：TG454[金属学及工艺—焊接]