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Numerical Simulation of Temperature Field in Process of Casting Solidification

ZHAO Xin, WEN Ze-feng, JIN Xue-song

National Traction Power Lab., Southwest Jiaotong University, Chengdu 610031, China

Abstract:

In order to obtain the variation law of temperature during casting solidification to improve casting quality,a finite element method combining with a finite difference method was used to discretize time and space variables in the governing equations of astable heat-conduction in the process of casting solidification so as to obtain the algebraic equations for casting and mold temperature.In order to solve the coupled problem of the equations governing temperature in the casting and the mold,alternative method of two-domain and an iterative method were used.In addition,varying time steps were automatically controlled in the light of the grade of change in temperature in order to save calculation time.For simplicity,some assumptions about boundary conditions were made,i.e.,the distributions of temperature in the casting and the mold are uniform at the beginning.The linear models exqressing the release of latent heat of the casting were used for the revised coefficient of specific heat.The calculational results show that with this method the distribution of temperature in castings can be simulated.

Keywords: casting   mold   temperature field   finite element method   finite difference method   heat transfer

DOI:

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