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A numerical model for prediction of shrinkage defects in iron castings has been developed. The model is based on gas pores evolution during solidification. It describes the evolution of gas concentration using mass conservation, and the change in melt pressure due to solidification contraction using Darcy's equation, with mixture continuity assumption in the liquid and the mushy zone. Gas pores nucleation has been calculated using the partial pressure of gas obtained from Sievert's law. Thedoi:10.4028/www.scientific.net/msf.925.411 fatcat:ihkpdwlybbbwnlwlnhv4v6gc5m