Effects of Filler Metal on Microstructure and Mechanical Properties of Stainless Steel Brazed Joint

The effects of brazing temperature on the microstructure,shear strength at room temperature and high temperature of 2Cr13 stainless steel joint brazed with 4# manganese filler metal in vacuum were studied.The research result was compared with stainless steel joint brazed with Ni-Cr-P filler metal.The results show that the brazed joint of 4# manganese filler metal is made up of Mn-Ni-Cu-Fe-Cr-Co solid solution.The shear strength of the brazed joint at room-temperature gradually increases with the increase of the brazing temperature.The brazed joint of Ni-Cr-P filler metal is made up of Ni-Fe solid solution and Ni(Cr,Fe)-P intermetallic.The shear strength of the brazed joint at room temperature is lower than the shear strength of the brazed joint of 4# manganese filler metal at room temperature.The shear strength at high temperature of the brazed joint of Ni-Cr-P filler metal and 4# manganese filler metal gradually and rapidly decreases above 500 ℃,respectively,but the 4# manganese filler metal is still higher than the brazed joint of Ni-Cr-P filler metal.