Abstract
Macrosegregation, a critical defect in metallic alloys, is mainly caused by the flow of solute-rich liquid phase in interdendritic channels. Liquid flow in the interdendritic zone can be evaluated by Darcy’s law when permeability is known. However, there is almost no effective way to calculate the permeability of actual macrostructure in industrial production. In the present work, a method for evaluating the permeability based on the actual macrostructure of continuous casting billet is proposed. First, dendrite arm spacing (DAS) of solidification structure in different sections was measured, and fractal dimension was introduced to evaluate the complexity of the dendritic outline. Then the permeability was calculated using DAS, fractal dimension (D), and segregation area ratio (Rseg). By comparing with the Santos–Melo model and solidification theory, the method proposed in the present work for calculating permeability was found to be effective. The value of permeability shows that the flow resistance in the mushy zone of a metallic alloy is different in each of the three spatial dimensions. The present results also show that flow velocity and direction of liquid in the mushy zone can be predicted using permeability of the actual metal. This may provide a new approach for delicately controlling the segregation defect.
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The authors are very grateful for support from United Funds between National Natural Science Foundation and Baowu Steel Group Corporation Limited from China (Grant No. U1860101).
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Manuscript submitted July 9, 2020, accepted January 15, 2021.
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Cao, J., Hou, Z., Liu, Q. et al. Quantitative Characterization of Solidification Structure in Different Sections for Calculating the Permeability in Actual High-Carbon Steel Billet. Metall Mater Trans B 52, 1132–1141 (2021). https://doi.org/10.1007/s11663-021-02087-9
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DOI: https://doi.org/10.1007/s11663-021-02087-9