Castability of thin walled titanium alloy castings in vertical centrifugal field

摘要

Different casting technologies were investigated on the thin walled titanium alloy castings in this paper, and the experimental results show that it is hard for the titanium alloy melts to fill the thin walled cavities in the gravity field. However, with the action of centrifugal force and Coriolis force on the melts in the centrifugal field, the cavities can be fully filled with the molten metal. The castability of thin walled titanium alloy castings was influenced by some casting parameters, such as rotational velocity, rotational radius and solidifying rate. Experimental results indicate that the forming ability of thin walled titanium alloy increases with increasing rotational velocity. However, the filling ability of molten metal changes a little with increasing rotational radius. In addition, under the experimental condition used in this paper, the number of internal defects of the thin walled castings decreases with increasing rotational velocity, but increases with increasing rotational radius. Filling sequence and solidifying rate play important roles in the defect formation of thin walled titanium alloy castings.