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NUMERICAL SIMULATION OF channel segregation IN Al-4.5wt-%Cu ALLOY

Acta Metallurgica Sinica(English Letters) 1991年第8期4卷 108-114页

作者： YU Qiuping ZHOU Yaohe Northwestern Polytechnical University,Xi’an,China Northwestern Polytechnical Univ Xi'an China

Equations for numerical simulation of channel segregation based on a model of continuum ap- proach to porous medium were *** order to solve the non-linear computation prob- lem caused by the interactions between unknown variables in the equations,the trial-and-er- ror method is *** computation results showed that the radial back-flow due to natural convection in mushy zone indeed exists in A1-4.5wt-%Cu alloy ingot under the condition of low cooling rate,and that the numerical simulation of channel segregation is applicable due to the coincidence of calculated concentration with the experimental values.

关键词： channel segregation numerical simulation back-flow mushy zone

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EFFECT OF GRAVITY FIELD ON SOLIDIFICATION BEHAVIOR OF STEEL INGOT

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Acta Metallurgica Sinica(English Letters) 1995年第2期8卷 110-114页

作者： CHEN Weide ZHENG Xianshu JIN Junze(Dalian University of Technology,Dalian,China Dalian Univ of Technology Dalian China

By means of numerical simulation. the in fluence of gravity on fluid flow,patterns has been *** result shows that with the increase of inclined angle,the velocity of fluid flow decreases and the isotherms become flatt... 详细信息

关键词： gravity field fluid flow.solidification behavior channel segregation

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Numerical Simulation of Macrosegregation for an Fe-0.8 wt pct C Alloy

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Journal of Materials Science & Technology 2009年第4期25卷 561-568页

作者： Dongrong Liu Dianzhong Li Baoguang Sang Institute of Metal Research Chinese Academy of Sciences Shenyang 110016 China School of Materials Science and Engineering Harbin University of Science and Technology Harbin 150040 China

Macrosegregation in Fe-0.8 wt pct C alloy solidifying with equiaxed morphology was numerically simulated. Based on a two-phase volumetric averaging approach, heat transfer, melt convection, composition distribution, nucleation and grain evolution on the system scale were described. A weak-coupling numerical procedure was designed to solve conservation equations. Simulations were conducted to study the effects of cooling rate and nuclei density on the macrosegregation pattern. The relative infliJence of thermal buoyancy- and solutal buoyancy-induced flows on macrosegregation was identified. Calculated results indicate that a higher cooling rate establishes a more homogeneous composition. More uniform solute distributions are formed with increasing nuclei density. In addition, it is noted that the direction of channel segregates depends on the relative strength of thermal and solutal buoyancy forces.

关键词： Macrosegregation channel segregation Thermosolutal convection Fe-C alloy

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