Prediction of Shrinkage Cavity in Heavy-Section Ductile Cast Iron Using CAE Considering Volume Change during Solidification

Abstract

A new analysis parameter, which is the volume balance during solidification in heavy section ductile cast irons, was adopted to predict shrinkage cavities by computer simulation. To realize higher precision and quantify the behavior of expansion/contraction during solidification, the temperature and solidification ratio of each reaction stage from the start to completion of solidification were determined by the tangent line method. The expansion/contraction amounts of each reaction were calculated from chemical compositions of carbon and silicon and the initial temperature of the test material. Finally, the expansion/contraction degree was calculated by dividing the amounts of the expansion/contraction at each reaction by the solidification ratio. The quantified value was input into the casting simulation software as the expansion/contraction amounts. The result showed better matching compared to the actual shrinkage phenomenon.

 

This Paper was Originally Published in Japanese in J. JFS 90 (2018) 175–181.