Modeling and Validating the Blind-feeder Designs of Ductile Iron Casting

摘要

In this study, two solidification modeling models were validated by ductile-iron casting experiments on various blind feeder designs. It is found that only the so-called first principles shrinking model could be used for predicting the flow phenomenon and volumetric expansion of spheroidal graphite during the solidification process of spheroidal graphite cast iron. It also could accurately track the lowest liquid level in the solid-liquid interface and predict the location of the negative pressure developed by the liquid-solid transformation during the solidification process. After casting the seven blind-feeder designs of ductile iron castings, the hardness in every 5 mm distances within the central cross-sectional plane of these castings were measured. The actual shrinkage contour and locations on the central plane of the castings were discovered. It shows that the shrinkage profiles and locations predicted by the FP model are the regions where the residual liquid at the lowest liquid level within isolated regions during solidification. For shrinkage profiles, the differences in between the real castings and the modeling results were explained.