保温时间对K452高温合金钎焊接头组织与性能的影响  

Effect of Holding Time on Microstructure and Mechanical Properties of K452 Superalloy Brazed Joints

作　　者：赵海生[1] 潘晖[1] 张学军[1] 刘永超[1] 

机构地区：[1]北京航空材料研究院,北京100095

出　　处：《航空材料学报》2015年第3期43-48,共6页Journal of Aeronautical Materials

摘　　要：采用钴基钎料及镍基合金粉料,分别在1170℃保温10min、60min和120min的钎焊工艺下,对K452镍基铸造高温合金进行真空钎焊实验,通过扫描电镜和能谱分析仪进行了接头显微组织观察与物相分析,并测试钎焊接头的高温力学性能。结果表明:在保温60min的工艺规范下,界面实现较好的结合,钎缝内部孔洞缺陷较少,钎缝组织均匀,有利于钎焊接头性能的提高;在更长的保温时间120min下,钎缝内部又有蚀孔缺陷形成,且较多的白色块状化合物在合金粉颗粒间聚集长大,但界面结合良好,钎焊接头性能较高,900℃抗拉强度达到400MPa,900℃/100MPa持久寿命为141h55min。Vacuum brazing of K452 superalloy was performed with cobalt-base filler metal and nickel-base superalloy powder under bra-zing conditions of 1 170℃ /10min,1 170℃ /60min and 1 170℃ /120min respectively.The microstructure of brazed joints was analyzed by using SEM and EDS,and the high-temperature mechanical properties were also studied.The results show that the sound joints with fine microstructure and rare pores are achieved under 1 170℃ /60min brazing procedure,due to the good quality of interface.The joints braze under 1 170℃ /120min show the highest mechanical properties because of better interface quality,the average 900℃ tensile strength of 400MPa and 900℃ /100MPa stress-rupture life of 141 h /55min.But there morepoles are presented,and many white parti-cles of compound congregated and grow up between the nickel-base superalloy powder in the brazing seam.

关 键 词：K452高温合金 钴基钎料 镍基合金粉 微观组织 拉伸性能 

分 类 号：TG454[金属学及工艺—焊接] TG146.15[一般工业技术—材料科学与工程]