Study on explosive welding for manufacturing meshing bonding interface of CuCrZr to 316L stainless steel

Highlights: • A new explosive welding technology was developed for manufacturing CuCrZr/316 L meshing bonding interface, • The shear strength of the meshing interface 0° and 90° was increased by 19% and 9%, when compared to the ordinary CuCrZr/316 L transition joints. • Metallurgical bonding without defects such as micropores and cracks has been created for the meshing interface. -- Abstract: In order to improve the CuCrZr/316L transition joints manufactured by explosive welding (EW), a new EW method was developed to obtain meshing bonding interfaces. The welding parameters adopted in the experiment were close to the lower limit, and the bonding quality was evaluated by systematically microstructure and mechanical tests. The results showed that the meshing interfaces can effectively enhance CuCrZr/316L EW-joints by increasing bonding area. The microstructure results indicated that metallurgical bonding of CuCrZr alloy to 316L stainless steel was created along the meshing interfaces, and two types of bond were observed at the bonding interfaces, namely metal/metal and metal/solidified melt. The EDS analysis indicated that the melt mainly consisted of Cu. Fractography studies on tensile specimens showed cleavage fracture on the CuCrZr side and ductile fracture on the 316L side near the interfaces. The tensile shear test results showed that the shear strength of the meshing interface 0° and 90° was increased by 19% and 9%, when compared to the ordinary CuCrZr/316L EW-joints. The results of microhardness test revealed that the values of microhardness decreased as the distance from the interface increased.