The Effect of Casting Technology on the Internal Quality,Micro structure,and Mechanical Properties of VW63Z Magnesium Alloy Disk Castings
The ProCAST software simulation,optical microscope observation,and room temperature tensile experiments were used to study the effect of casting process on the internal quality,microstructure,and mechanical properties of VW63Z magnesium alloy disk castings.The results showed that there were looseness and slag inclusion defects on the disc casting of gravity casting,while the slag inclusion,looseness,micro-crack and other casting defect were not found on the disc casting of anti-gravity casting.The microstructure analysis results showed that the microstructure of the gravity cast disc casting was uneven,and the average grain size was 95 μm.The microstructure of the disc cast by anti-gravity casting was more uniform,and the average grain size was only 70 μm.The mechanical properties test results indicated that the mechanical properties of the disc casting cast by anti-gravity casting were the highest,and the average tensile strength,average yield strength and elongation at room temperature were 315.75 MPa、215.50 MPa and 6.90％,respectively;the average tensile strength,average yield strength,and elongation after at 160 ℃ were 295.75 MPa、196.75 MPa,and 9.85％,respectively.
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