발간논문

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Vol.10, No.4, 239 ~ 246, 1972
Title
Shrinkage Cavity of Spheroidal Graphite Cast Iron
김수영Soo Young Kim, 김상익Sang Ik Lee, 김석윤Suk Yoon Kim
Abstract
Among the deteriorate produced in the spheroidal graphite cast iron, shrinkage cavity could be the most important influence. In order to find out the causes of formation of the shrinkage cavity, effects of volume change of molten metal at various temperatures and eutectic solidification have been investigated for both spheroidal and flaky graphite cast iron with same composition. The results obtained from the study are summarized as follows. (1) Volume changes of molten metal at various temperatures are 1.5∼1.7%/100℃ and similar both in spheroidal and flaky graphite cast iron. (2) Solidification of spheroidal graphite cast iron melt is a severe mushy type resulting eutectic solidification expansion which is seemed to introduce influence to the sand mold and produces large cavity.
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