Hastelloy X高温合金活性扩散钎焊接头的微观结构  

Microstructure of Hastelloy X superalloy’s joints by activated diffusion brazing

作　　者：杨斯楠 刘岩[2] 丁坤英[1] 王志平[1] Yang Sinan;Liu Yan;Ding Kunying;Wang Zhiping(Civil Aviation University of China,Tianjin Key Laboratory of Civil Aircraft Airworthiness and Maintenance,Tianjin 300300,China;Shanghai Institute of Ceramics,Chinese Academy of Sciences,Shanghai 201800,China)

机构地区：[1]中国民航大学天津民用航空器适航与维修重点实验室,天津300300 [2]中国科学院上海硅酸盐研究所,上海201800

出　　处：《焊接》2019年第12期22-26,31,I0026,共7页Welding & Joining

基　　金：中国民航大学天津市民用航空器适航与维修重点实验室开发基金资助项目(2017SW05)。

摘　　要：采用Ni-Cr-Fe基钎料对Hastelloy X高温合金进行了活性扩散钎焊。通过扫描电镜、能谱分析、X射线衍射等测试手段分析了接头微观结构和相组成,并且研究不同焊接温度和保温时间对接头微观结构演变的影响。结果表明,焊接接头主要包括凝固区、扩散区和基体区,其中凝固区主要由γ固溶体和复杂硼化物M 3 B 2(M=Cr,Mo)组成;而扩散区则由γ固溶体和3种不同形态的Cr,Mo的硼化物组成。随着焊接温度的升高和保温时间的延长,扩散区晶内析出的硼化物逐渐减少,同时在晶间处的析出相增多。在1170℃,30 min条件下,接头的最大硬度出现在凝固区的析出相位置,约为406 HV1。Hastelloy X superalloy was bonded with Ni-Cr-Fe based brazing filler metal by activated diffusion brazing(ADB).Microstructure and phase composition of brazed joints were analyzed by scanning electron microscopy,energy dispersive spectrometer and X-ray diffraction,and effects of brazing temperatures and holding times on microstructure evolution of brazed joints were investigated.The results showed that the brazed joint mainly includes solidification zone,diffusion zone and base material.The solidification zone was mainly composed ofγsolid solution phase and complex boride M 3 B 2(M=Cr,Mo),while the diffusion zone was made up ofγsolid solution phase and three different forms of Cr and Mo borides.With the increase of brazing temperature and the extension of holding time,the number of boride precipitated in the grain interior of the diffusion zone gradually decreased,while the number of precipitating phase increased at the grain boundary.The maximum hardness value of the joint bonded at 1170℃for 30 min appeared at the position of precipitation phase in the solidification zone,which was about 406 HV1.

关 键 词：Hastelloy X 活性扩散钎焊 微观结构 显微硬度 

分 类 号：TG454[金属学及工艺—焊接]