Finite element analysis and nanoindentation-based experiment of residual stress of SS304/BNi-2/SS304 stainless steel brazed joints

The numerical analysis was implemented on the residual stress of the SS304/BNi-2/SS304 T shape brazed joint by both finite element method (FEM) employing ABAQUS sequentially coupling code and Nanoindentation technology. The results show that the residual stress of the brazed joint produced due to the mechanical property mismatch of the base metal SS304 and the filler BNi-2. The residual stress which can induce the crack initiation and is maximum at the fillet and decreases gradually along the mid-seaming. The other zone is uniformity. So the fillet becomes the weakest area. The Nanoindentation test adopts the Suresh model and the experimental results are corresponded with the FEM and also prove the efficient and reliability of FEM.