A micro-modeling method (MM) for the quantitative prediction of the shrinkage cavity and porosity of SG iron was proposed in this paper. The mathematical models describing the volume changes during the solidification of SG iron were established based on the micro-modeling. The shrinkage cavity formation of T-shaped SG iron samples was calculated with MM method. The calculated results were compared with the experimental results as well as with those of Dynamic Expansion Contraction Accumulation Method (DECAM), which was based on the macro-modeling. It was shown that the predicted size and distribution of shrinkage cavity and porosity by MM method were more accurate than that of DECAM. However, the predicted shape of shrinkage cavity by both MM and DECAM was identical and both were in good agreement with the measured results.
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