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Phase-field–lattice Boltzmann simulation of dendrite growth under natural convection in multicomponent superalloy solidification

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Abstract

The thermosolutal convection can alter segregation pattern, change dendrite morphology and even cause freckles formation in alloy solidification. In this work, the multiphase-field model was coupled with lattice Boltzmann method to simulate the dendrite growth under melt convection in superalloy solidification. In the isothermal solidification simulations, zero and normal gravitational accelerations were applied to investigate the effects of gravity on the dendrite morphology and the magnitude of melt flow. The solute distribution of each alloy component along with the dendrite tip velocity during solidification was obtained, and the natural convection has been confirmed to affect the microsegregation pattern and the dendrite growth velocity. In the directional solidification simulations, two typical temperature gradients were applied, and the dendrite morphology and fluid velocity in the mushy zone during solidification were analyzed. It is found that the freckles will form when the average fluid velocity in the mushy zone exceeds the withdraw velocity.

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Acknowledgements

This study was financially supported by the National Key Research and Development Program of China (No. 2017YFB0701503), the National Science and Technology Major Project (No. 2017ZX04014001) and the National Natural Science Foundation of China (No. 51374137).

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Authors and Affiliations

  1. Key Laboratory for Advanced Materials Processing Technology (Ministry of Education), School of Materials Science and Engineering, Tsinghua University, Beijing, 100084, China

    Cong Yang, Qing-Yan Xu & Bai-Cheng Liu

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  1. Cong Yang
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  2. Qing-Yan Xu
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  3. Bai-Cheng Liu
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Correspondence to Qing-Yan Xu.

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Yang, C., Xu, QY. & Liu, BC. Phase-field–lattice Boltzmann simulation of dendrite growth under natural convection in multicomponent superalloy solidification. Rare Met. 39, 147–155 (2020). https://doi.org/10.1007/s12598-019-01292-5

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