Brazing of Mn–Cu Alloy and 430 Stainless Steel with Cu–34Mn–6Ni–10Sn Filler Metal

抄録

In this paper, brazing of Mn–Cu damping alloy and 430 stainless steel (SS) using Cu–34Mn–6Ni–10Sn filler metal was carried out at different temperatures (850 °C to 880 °C) for different times (5 min to 12 min). The microstructure and mechanical properties of brazed joints were investigated. The results show that a (Fe, Mn) solid solution diffusion layer was formed at the interface between SS and brazing seam. The brazing seam was composed of a (Cu, Mn) solid solution phase and a (Cu, Mn, Sn) solid solution phase. Besides, the needle-like Mn–Cr–Cu–Fe compounds were found to distribute near the interface of each substrate and brazing seam. The grain boundary penetration of (Cu, Mn, Sn) solid solution phase led to the local melting of Mn–Cu alloy. The joint brazed at 870 °C for 10 min possessed the highest shear strength of about 212 MPa, the fracture occurred at the middle of brazing seam.

Fig. 4 BSE images of the microstructure of (a) Mn–Cu/SS joint brazed at 870 °C for 10 min and (b) the interface region of SS/brazing seam, surface scan of Sn (c) and Cr (d) of (b).