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首页> 外文期刊>ISIJ international >Numerical Simulation of Microstructure of Al-Si/SiC_p Composites during Stir Casting Process with ParticlePushing Model
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Numerical Simulation of Microstructure of Al-Si/SiC_p Composites during Stir Casting Process with ParticlePushing Model

机译：粒子推进模型搅拌铸造Al-Si / SiC_p复合材料组织的数值模拟。

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摘要

Particle distribution has vital influence on the microstructure and the final performance of particle reinforced metal matrix composite. The formation of microstructure of SiC particle reinforced Al-7.0mass%Si composite made by stir casting was simulated in this paper. Two-dimensional models under normal solidification condition including macro heat transfer, micro nucleation, equiaxed dendrite growth and particle pushing were presented. Two sets of meshes were used to carry out macro and micro calculation, respectively. A modified cellular automaton method coupled with finite difference method was used to simulate the evolution of the composite microstructure. In addition, the effects of SiC particle volume fraction, different casting processes, pouring temperature and cooling rate on the composite microstructure and the particles distribution were analyzed. The simulated results can clearly show the particle clustering/accumulation phenomenon caused by particle pushing. The calculated cooling curve and final predicted microstructure are in good agreement with the experimental results. Grain size is smaller for metal mould casting than sand mould casting. With the increase of SiC particle volume fraction or cooling rate, the grains of the matrix alloy are refined and particles are distributed more uniformly. As the pouring temperature increases, particles are distributed more uniformly.
机译：颗粒分布对颗粒增强金属基复合材料的微观结构和最终性能具有至关重要的影响。模拟了搅拌铸造SiC颗粒增强Al-7.0质量％Si复合材料的微观组织形成。提出了在正常凝固条件下的二维模型，包括宏观传热，微核化，等轴枝晶生长和颗粒推进。使用两组网格分别进行宏观和微观计算。结合有限差分法的改进的细胞自动机方法被用来模拟复合材料微观结构的演化。此外，分析了SiC颗粒体积分数，不同铸造工艺，浇注温度和冷却速率对复合材料显微组织和颗粒分布的影响。仿真结果可以清楚地表明由于颗粒推挤引起的颗粒聚集/聚集现象。计算得出的冷却曲线和最终预测的显微组织与实验结果非常吻合。与砂型铸造相比，金属型铸造的晶粒尺寸较小。随着SiC颗粒体积分数或冷却速率的增加，基体合金晶粒细化，颗粒分布更加均匀。随着浇注温度的升高，颗粒分布更加均匀。

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