Ductile iron nodule count, the factors affecting it and its effect on properties and response to heat treatment were evaluated through a literature search and review. The primary purpose was to de termine if nodule count could be maximized efficiently and consis tently, and if high nodule counts could be effective in minimizing segregation conditions that apparently affect properties. The search revealed that very little work has been done specifi cally tQ understand these nodule count factors. Nodule count was discussed as a secondary effect in many ductile iron studies that included treatment, inoculation and solidification. However, many of these studies did not separate the effect on matrixfrom the effect of nodule count. This review evaluated the literature for processing effects on nodule count, the effects of alloying elements on nodule count and the effect of nodule count on mechanical properties. As a result of the review, several areas needing additional research were iden tified. These areas include: 1. effect of nodule count on mechanical properties; 2. effect of nodule count on heat-treated structures; 3. factors such as alloying elements that affect nodule count.
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