抄録
Using a thermal analysis system consisting of three cups, the eutectic graphitization ability (ΔT1/ΔTE) which shows the melt quality was investigated. From the viewpoint of graphite type and the tensile strength, it was tried to verify that this ability serves as a useful a good value for evaluating the quality of cast iron. Various composition melts were inoculated and held in a furnace, after which they were cast at various fading times into three cups (First : Inoculated, Second : Base melt, Third : Tellurium added) and transverse test bar mold (φ30×500mm). Using the cooling curves of eutectic temperature obtained by three cups, eutectic graphitization ability was calculated and the relation between this ability and graphite types and mechanical properties was investigated. A good relationship was found between eutectic graphitization ability and graphite types, excepting for Ti added melts. And this ability is well related to tensile strength. Compared to the degree of normality which is suggested by Patterson, the eutectic graphitization ability is much better in predicting the quality of cast iron.
