Abstract
Casting dilation is often measured during solidification to study the mechanism of shrinkage. In previous papers, the author reported on the casting dilation during solidification in rigid molds, but this paper is a report on the casting dilation in softer molds. The experiments were conducted to study the correlation between the casting dilation during solidification and shrinkage in softer molds at various carbon equivalents of Mg-treated hyper-eutectic spheroidal graphite iron. The results obtained are summarized as follows :
(1) The behavior of casting dilation during so1idification in softer molds was opposite to that in rigid molds, the casting dilation increasing with decreasing carbon equivalent.
(2) Casting dilation curves clearly showed that the casting dilation observed from the start of pouring to the start of eutectic solidification was larger than that observed during eutectic solidification.
(3) The volume of shrinkage became larger at lower carbon equivalents and lesser rigid mold.
