Abstract
Ti-55531 is difficult to achieve samples by a vacuum suction casting. Therefore, the experimental parameters of the suction casting are simulated, and the properties of Ti-55531 alloy with the microscale refining solidification microstructure are studied. The results show that the preparation parameters simulated through the ProCAST on Ti-55531 are obtained. Pouring temperature of 1662 °C is selected as the experimental temperature. Suction casting speed of 2 m/s is selected owing to it with a greater influence on the filling rate. Model temperature of 20 °C is selected with the low temperature. The copper casting mold is selected as the heat transfer coefficient of mold has very small effect on filling rate. The solidification time is not significantly affected by the pouring temperature and the mold temperature. The properties of Ti-55531-0.1 % La are further improved, due to the solidification structure with the microscale refining solidification microstructure for an average spacing of 3.6 μm in the edge. The hardness and strength in the edge both are 11.1 % higher than that in the centre due to refined structure. This study provides a new idea for the formation of a fine microstructure of titanium alloy.
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