钎料Si含量对N5单晶钎焊接头组织和持久性能的影响  

Effect of Si content in filler metal on microstructure and creep rupture properties of N5 single crystal brazed joints

作　　者：柴禄[1] 侯金保[1] 

机构地区：[1]北京航空制造工程研究所航空焊接与连接技术航空科技重点实验室,北京100024

出　　处：《金属热处理》2017年第3期143-147,共5页Heat Treatment of Metals

摘　　要：采用自制镍基粉末钎料对N5单晶进行高温钎焊,利用扫描电镜对接头组织进行观察,并对接头进行了高温持久性能测试。结果表明:钎料中硅含量对接头组织有较大影响,硅含量为2.0%~4.0%时接头中存在富硅的块状化合物,高温持久断裂时裂纹沿化合物相形核、扩展,最终导致材料发生沿晶断裂。当硅含量为1.0%~2.0%时接头组织均匀,且不存在富硅化合物,高温持久性能相对更好。N5 single crystal superalloys were brazed with self-developed nickel base brazing filler metals. Microstructure of the joint was observed using scanning electron microscopy. High temperature creep rupture test was carried out. The results show that silicon content has a considirable effect on brazed joint microstructure. When silicon content is between 2. 0%-4. 0%,there are Si-rich bulk compounds in the joint where cracks would generate,extend and finally result in a intergranular fracture,when silicon content between 1. 0%-2. 0%,the joints have uniform microstructure without Si-rich compounds and have relatively better creep rupture properties.

关 键 词：单晶 钎焊接头 SI含量 组织 持久性能 

分 类 号：TG454[金属学及工艺—焊接]