电子束钎焊修复K465镍基高温合金叶片

Electron beam brazing repair of K465 Ni-base superalloy blades

摘要: 采用自制镍基钎料进行了K465镍基高温合金叶片模拟件的真空电子束钎焊,研究了开贯通槽(磨掉全部裂纹)和开非贯通槽(磨掉80%~90%裂纹)的两种开槽方式对叶片模拟件接头产生裂纹的影响,分析发现开贯通槽试件很少产生裂纹而开非贯通槽试件都产生裂纹.借助扫描电镜(SEM)、能谱分析(EDS)和X射线衍射分析(XRD)等方法分析了接头界面结构,确定了界面反应产物及其形态分布.结果表明,在界面反应层中生成镍基γ固溶体,Ni₂Si,Ni₃B,Ni₃Al和Ni₃Si五种产物.

Abstract: The vacuum electron beam brazing(VEBB) of K465 Ni-base superalloys blades with self-made filler metal was studied.Effects of through slot(grinding off all the cracks) and non-through slot(grinding off 80% to 90% the cracks) on the cracks of joints were investigated.It's discovered very few through slot specimens have cracks and all non-through specimens have cracks.Microstructure of the brazed joints with self-made filler metal was studied by means of scanning electron microscopy(SEM),energy disperse spectrum(EDS) and X ray diffraction(XRD).The results show that the structure of brazing seam consists of Ni-base γ solid solution,Ni₂Si,Ni₃B,Ni₃Al and Ni₃Si.