关键词: 球化率, 相子, 止裂体

Abstract: The strength of metallic materials is controlled primarily by their microstructure. This should hold true for ductile iron too. However, the graphite’s in ductile iron have this own peculiar effects which render most strength relations non-applicable. The author had established a strength relation, using phase-quanta concept, for general two-phase structure and now modified it into a new relation in which the peculiar effects of the graphite’s had been conceded. After verifying with the published data all were found in good agreement.

Key words: 球化率, 相子, 止裂体