Abstract
Effects of molten metal treatments particularly melt superheating or melt heating at high temperature above 800°C on the shape of shrinkage cavities in practical ADC 12 alloy castings were studied. Shrinkage cavities in the castings made from secondary alloy ingots change in shape from porous to pipe-like by melt superheating. The pipe-like cavities are often formed in vacuum degassed castings and virgin ingots. Change of shrinkage cavities in ADC 12 alloy castings made from secondary alloy ingots depends both on dissolved gases and some melt properties, but is unsusceptible to metallic impurities.
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