Liu Qiang
School of Mechatronics Engineering, Nanchang University, Nanchang, 330031, China
Yang Xiang-Jie
School of Mechatronics Engineering, Nanchang University, Nanchang, 330031, China
Liu Zhi-Ling
Vocational Technical College Jiangxi Science and Technology, Normal University, Nanchang, 330038, China
ABSTRACT
The dendrite growth of binary alloy Al-Si under the forced convection was simulated by the phase field model coupled with the solute field and flow field. The influences of the forced convection on the morphology of the dendrite growth, the distribution, diffusion layer and micro-segregation of the solute, etc. were studied. The results show that the morphology of the dendrite growth, the distribution, diffusion layer and micro-segregation of the solute were significantly changed under forced convection. With increasing of the convection speed, the growth of the dendrite is asymmetric. The upstream dendrite growth rate is greater than that of the downstream. The secondary dendrite at upstream was more developed and the dendrite in normal direction was bias more serious to the upstream. In the upstream, the concentration gradient at dendrite tip frontier increases and the thickness of the solute diffusion layer decreases. On the contrary, the concentration gradient decreases in the downstream and the thickness of the solute diffusion layer increases. Furthermore, micro segregation of the dendrite also becomes more serious caused by the effect of convection. The simulation results are consistent with solidification theory.
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How to cite this article
Liu Qiang, Yang Xiang-Jie and Liu Zhi-Ling, 2013. Influence of the Melt Flow Rate on Dendrite Micro Segregation During Alloy Solidification Simulated by Phase Field Method. Journal of Applied Sciences, 13: 2700-2704.
DOI: 10.3923/jas.2013.2700.2704
URL: https://scialert.net/abstract/?doi=jas.2013.2700.2704
DOI: 10.3923/jas.2013.2700.2704
URL: https://scialert.net/abstract/?doi=jas.2013.2700.2704
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