Strength and Movement of Solid Skin during Solidification of Cast Iron in the Sand Mold

Abstract

The strength of the solid skin and its movement during solidification in the mold were measured when molten cast iron was poured into a self-hardening sand mold.
The strength of the solid skin was low immediately after pouring, but increased rapidly after a certain period of time. The strength immediately after pouring depended on the property of iron, increasing in the order of magnesium treated spheroidal graphite iron, calcium treated spheroidal graphite iron, inoculated gray iron, non-inoculated gray iron. Carbon content had little effect on the strength of the solid skin. The solid skin moved toward the metal immediately after pouring, then it moved toward the mold after a certain period of time. The distance of movement toward the mold increased as the strength of the solid skin decreased.