Abstract
A vacuum brazing process using an Ag-based alloy (Ag-28Cu, wt%) as a filler metal was carried out on a dissimilar combination of martensitic stainless steel/tin bronze to understand the material flow characteristic and the influence of micro structure evolution on the shear strength of the brazed joint. A suitable combination of brazing temperature (850°C) and holding time (12min) was found to be beneficial for eliminating internal gaps and voids and providing for a uniform circumferential thickness distribution to satisfy the technical requirements. Cu-based and Ni-based solid solution phases were generated between the filler metal and the Ni layer, which contributed to the shear strength. With the addition of an annealing process, a quantity of Fe from the martensitic stainless steel diffused into the Ni layer, and the intermetallic compound (FeNi3) was generated. Under shear deformation, the brittle intermetallic compound promoted crack initiation, subsequent crack propagation, and final fracture failure, and the shear strength decreased from 260MPa to 180MPa.
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