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Numerical Simulations of Equiaxed Dendrite Growth Using Phase Field Method

Journal of Materials Science & Technology 2002年第1期18卷 51-53页

作者： yutuozhang WeichengPANG 等 InstituteofMetalResearch TheChineseAcademyofScienceShenyang110016China SchoolofMaterialsandMetallurgy NortheasternUniversityShengyang110006China

Phase field method offers the prospect of being able to perform realistic numerical experiments on dendrite growth in a metallic system. In this paper, the equiaxed dendrite evolution during the solidification of a pure material was numerically simulated using the phase field model. The equiaxed dendrite growth in a two-dimensional square domain of undercooled melt (nickel) with four-fold anisotropy was simulated. The phase field model equations was solved using the explicit finite difference method on a uniform mesh. The formation of various equiaxed dendrite patterns was shown by a series of simulations, and the effect of anisotropy on equiaxed dendrite morphology was investigated.

关键词： Phase field method Dendritic growth Numerical simulation

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Modelling of Phase Transformation of Plain Carbon Steels during Continuous Cooling

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Journal of Materials Science & Technology 2003年第3期19卷 262-264页

作者： yutuozhang ChunliMO DianzhongLI YiyiLI InstituteofMetalResearch ChineseAcademyofSciencesShenyang110016China ShenyangInstituteofTechnology Shenyang110016China

A model based on Avrami equation and Scheil's additivity rule was proposed to simulate the phase transformation in plain carbon steels during continuous cooling in hot strip mill. In this model, a wide range of composition, cooling rate, primary austenite grain size and retained strain has been taken into account. It can be used to calculate the phase fraction transformed at different temperatures during continuous cooling. The phase equilibrium and transformation starting temperature can be determined by using Thermo-Calc and DICTRA. The simulated results containing the transformation at starting and finishing temperatures, Ae1, Ae3 and the maximum volume fraction for Q235B, were obtained. The calculated phase volume fractions are in good agreement with .the experimental results.

关键词： Phase transformation Continuous cooling Plain carbon steels

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