Abstract
This work intends to clarify how the morphology of graphite in CV graphite cast iron influences the heat-resistance. In terms of the growth, in CV graphite cast irons pearlite-cementite decomposition coefficient is small and there is only minor reversivility expansion by A1 transformation, then they grow little. Also oxidation-decarburization depends on the morphology, size, distribution and quantity of graphite which are closely related to the invasion of oxygen. It was confirmed that CV graphite cast irons, due to the morphology of CV graphite, has a strong resistance against oxygen invasion, and hence are almostly not oxidized and decarburized. It is considered from the results of thses tests that compared with grey cast irons, CV graphite cast irons have relatively good resistances for growth and oxidation, and hence have good heat-resistance.
