Electron beam brazing repair of K465 Ni-base superalloy blades

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.