34 - Shrinkage in Ductile Iron - An Executive Summary

Abstract:

A Taguchi design investigation has been made into the relationship between shrinkage and process variables, microstructure, and thermal analysis parameters in ductile iron castings. The most important process parameters to reduce or eliminate the formation of remote area (un-fed) shrinkage were determined. The designed experiments used a standardized experimental procedure that consisted of 7 factors at two different levels, the factors being: tap temperature; silicon content; graphite type; magnesium alloy type; time after magnesium treatment (holding time); method of addition of inoculant; in-mold inoculation (yes or no). Carbon content was kept constant.