By analyzing the characteristics of the layered defects of solid castings and their formation mechanism, it is considered that among various factors, the cross-sectional area of ​​the inner gate of the step casting system is smaller than the cross-sectional area of ​​the sprue, which is the key to the formation of layered defects. Increasing the casting temperature of molten metal and improving the coating, using low-density foam as a model material can help to avoid delamination defects.
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