Abstract
Molten iron was heated at 1,450°C and poured into metal molds preheated at temperatures ranging from 950° to 1,120°C. The solidification processes thus cast were measured by a highspeed automatic thermorecorder provided with Pt-Pt:Rh thermocouple. The temperature-time solidification curve of cast iron thus obtained consisted of two parts, namely metastable solidification and stable one. In case of grey cast iron the degree of undercooling during eutectic solidification increased with increasing cooling rate until the cooling rate had attained a critical value. The graphite eutectic temperature increased with increasing silicon contents, while the ledeburite eutectic temperature reversely decreased with increasing them. Therefore, the graphite eutectic freezing range was made wider with increasing silicon contents.
