Abstract
According to the principle of microdamage mechanics, the evolutional law of graphite void in ferrite ductile cast iron was studied under action of strain. The results showed that strain has a remarkable influence on growth of graphite void. The mathematical model of growth law of void volume was obtained. The interaction between nodular graphite has a great effect on void growth. The nodularity of graphite has a little influence on critical fraction of void volume. Therefore, the critical fraction could act as a fracture parameter of ductile iron. The theory and test proved that large nodular graphite results in rapid growth of void. This provides the theoretical basis for controlling of microstructure and mechanical properties of ductile iron.
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