Abstract
In this work, a high quality thin-walled aluminum alloy casting with large thickness mutation and thin-walled parts accounting for 70% was manufactured by vacuum differential pressure casting. The influence of pouring temperatures on casting defects of the shell casting was investigated by numerical simulation software ProCAST and detection of the testing casting. The results indicated that the mobility of the molten metal was improved with pouring temperature increased from 680 to 750°C. In addition, as pouring temperature increased, the shrinkage of liquid metal in solidification process increased, which could lead to porosity shrinkage defects. The filling results were not good when the pouring temperature was set between 680 and 720°C. Meanwhile, the feeding channels were blocked during the solidification except using pouring temperature of 740°C. The optimized pouring temperature was chosen for 740°C according to the numerical simulation results. The fluorescence detection, X-ray detection, mechanical performance testing and metallographic observation results showed that the casting with fine microstructure and comprehensive mechanical properties could meet the aviation standards and be applied in aircraft engine.
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