Interface of components with large ratio of altitude to diameter formed by laminated pouring and accumulated liquid forging technology

摘要

Based on the experiment of laminated pouring and accumulated liquid forging of 2A12 aluminum alloy, interface bonding of formed component with large altitude to dimeter ratio of altitude to diameter was investigated by means of SEM and Instron tensile tester. The results show that the method of laminated pouring and accumulated liquid forging can be used for forming components with large ratio. Pouring temperature, reheated temperature of die, pressure, pouring layers and standing time are all important technique parameters that influence the mechanical properties. When pouring temperature is 740 ℃, reheated temperature of die is 480 ℃, pressure is 500 kN, pouring layers are three and standing time is 5 s, the mechanical properties of interface are the optimum ones, microstructure is equiaxed crystal and tensile fracture has character of dimple. There are three kinds of bonding, which are melting bonding, part melting bonding and mechanical bonding. And the interface of the melting bonding possesses the best mechanical properties.