Research on Optimization of Rare-Earth Magnesium Alloy Frame Casting Process
The ProCAST software and test verification method were used to optimize the casting process of rare-earth magnesium alloy frame,and the X-ray non-destructive testing,optical microscopy and other equipments were used to characterize the internal quality,microstructures and mechanical properties of the castings.The results showed that there were many defects such as slag inclusions,blowholes and porosities in castings due to insufficient feeding effect before process optimization.After the process optimization,by adjusting the gating and feeding system,the internal dispersed shrinkage and blowhole defects of castings basically disappeared,and the pass rate of castings increased from 68.2％to 93.5％.The microstructure observation showed that the as-cast microstructure was composed of α-Mg matrix and the second phase distributed in a continuous network along the grain boundary.The grain sizes of the castings become smaller after the process optimization,reaching 35.99 μm averagely.The mechanical property tests showed that after the process optimization,the average tensile strength and post-break elongation of the casting at room temperature in T6 state were 265.33 MPa and 7.17％,compared with the process before improvement,increasing by 23.03％and 26.46％,respectively.
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