Structure and Property of Stainless Steel Brazed Joint with CuMnNiSi Filler Metal

The effects of brazing temperature and holding time on the microstructure and mechanical property at room-temperature of the brazed stainless steel joint with Cu-Mn-Ni-Si filler metal in vacuum were studied.The results show that the brazed joint is made up of Cu-Mn based solid solution in the middle area of the brazing seam and(Fe,Ni,Mn)-Si intermetallic phase in the reaction area near the interface.The volume of intermetallic phase decreases and joint clearance is primarily occupied by Cu-Mn based solid solution with the increase of brazing temperature,the shear strength of the brazed joint at room-temperature increases with the increase of the brazing temperature and reaches 321 MPa when brazing holding time is 15 min and brazing temperature is 1050 ℃.The shear strength of the brazed joint at room-temperature increases first and then decreases with the increase of the brazing holding times,and reaches 305 MPa when the brazing holding time is 30 min.