The Investigation of Mechanical Properties Of Brazing Martensitic St St 420 by Ag-Cu-Ti Filler Metal Alloy

In this study, martensitic stainless steel was brazed in a high-vacuum environment using tetanium, an active filler alloy, at a pressure of 10-15 mn. Two brazing temperatures (900 and 950°C) were chosen based on the solidus temperature of Ag Cu Ti filler alloy to examine the impacts of titanium % on the performance of the brazed joint. Brazing processes were carried out over a period of time to ensure that the filler alloy was fully melted (10 minutes).     Shear test was used to determine the bonding strength of the brazing procedure, while microstructural analysis was used to study the bonding morphology. According to the data, a maximum value of shear strength (12-10 MPa) was obtained at a brazing temperature of 900-950 °C. Due to the interdiffusion influence of different components from the active brazing filler, the formation of two reaction layers that crossed in the center of the brazed region was also demonstrated morphologically to affect the maximum shear strength.