Dissertations and Theses @ UNI


Open Access Thesis


Ductile iron -- Additives; Iron founding


This study involved the investigation of three specific, commercially available, post inoculants for ductile iron and their effect on the magnesium fading rate and chill reducing tendency in a low volume production environment. Although fading effects of ductile iron have been extensively investigated, in general, they apply to high volume production operations. Unfortunately, for the smaller foundry operations, many of the process solutions proposed for the prevention of the fading effects are not applicable or practical. In addition to the small production operations, new process technologies are also excluded from many of these process solutions. For this reason, a study was conducted to determine the influence of inoculants on the fading effects of magnesium and inoculation during extended holding of molten nodular iron.

The one-step magnesium and inoculation treatment process was utilized in this study. The master alloy was a 6% magnesium ferrosilicon, barium containing, alloy. The experimental inoculants used for the study were chosen based on their specific chemical composition. Experimental inoculant A, a foundry grade ferrosilicon 75% alloy, was chosen as the control group. Experimental inoculants Band C were chosen because of their varying levels of calcium and barium in the alloy.

Results obtained from the three experiments regarding any beneficial effect on magnesium fade, showed that there was no substantial differences between the three experimental inoculants. The residual magnesium levels, percentage nodularity and brinell hardness values, for the three experiments, all decreased with time at comparable rates. It was demonstrated that the experimental inoculants Band Care superior to the control inoculant A in terms of their chill reducing tendency in the thin-walled test samples. The high barium and high calcium containing inoculant C, proved to be the most effective chill reducer by limiting carbide formation while maintaining acceptable nodularity in the as-cast thin-walled test castings over an extended period of time.

Year of Submission


Degree Name

Master of Arts


Department of Industrial Technology

First Advisor

Yury S. Lerner


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Date Original


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