Numerical study of macrosegregation formation of ingot cast in normal sand mold and water-cooled sand mold

Dongrong LIU 1,2),Xiuhong KANG 1)*,Baoguang SANG 1) and Dianzhong LI 1) 1) Institute of Metal Research,Chinese Academy of Sciences,Shenyang 110016,China 2) School of Materials Science and Engineering,Harbin University of Science and Technology,Harbin 150040,China

摘 要：Formation of macrosegregation of 5 t steel ingots cast in sand molds with and without water-cooled copper tube is simulated by solving macroscopic mass,momentum,species and energy conservation equations with the consideration of shrinkage formation.Predicted macrosegregation pattern of the ingots shows a fair agreement with the experimental data.Both calculations and experiments reveal that some positive segregation patches are formed at the bottom of ingot.With the water-cooled copper tube inserted in the sand mold,the ingot cast has a less intensive macrosegregation.Mechanisms of macrosegregation formation are numerically analyzed.Explanations regarding the influences of fluid flow and temperature change upon the segregation formation are provided.

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