Interface Bonding Behavior of 2219Al/AZ31B Alloy Bimetallic Ring Blank Subjected to Vertical Centrifugal Casting

The vertical centrifugal casting of 2219Al/AZ31B alloy bimetallic ring blank is performed using ProCAST software. The influence of rotation speed of casting mold and the pouring interval between the inner layer and outer layer on the interface bonding behavior were studied. The results show that the filling process of the metal liquid is more stable with the increasing rotation speed. A fewer shrinkage defects near to the bonding interface of the bimetallic ring blank are obtained at the rotation speed of 500-600 r min −1 . The heat dissipation speed at the outer layer is accelerated with the increasing pouring interval, which results in the metallurgical bonding is more difficult for the inner and outer layers. The pouring interval of 386 s and rotation speed of 500 r min −1 are recommended to the optimum casting parameters, contributing to a sound bonding interface. At these conditions, the axial metallurgical bonding height of approximately 190.34 mm is achieved. The microstructure at the bonding interface is composed of coarse equiaxed grains near to the inner surface of the outer layer and fine equiaxed grains near to the outer surface of the inner layer.