| Title |
Shrinkage Cavity of Spheroidal Graphite Cast Iron |
| Authors |
김수영(Soo Young Kim); 김상익(Sang Ik Lee); 김석윤(Suk 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. |