Wettability and interfacial reaction product of electron beam brazing of Ni-base superalloys K465

The vacuum electron beam brazing (VEBB) of Ni-base superalloys with Bnp27 and BNi-2 filler metals was studied. In process of VEBB, effects of primary brazing parameters on wettability and selection of filler metals were investigated, then it points out that electron beam current is the most significant factors. Moreover, microstructure of brazed joint with Bnp27 filler metal was studied by means of scanning electron microscope, energy disperse spectrum and X ray diffraction. The investigation shows that the structure of brazing seam consists of a large amount of γ solid solution, a large amount of Ni₃B and CrB rich in W, and a small quantity of NbC.