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Dendritic growth during directional solidification of hypoeutectic Fe-C-Si alloys

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Abstract

The liquid decanting technique has been used to study the morphology of dendrites in directionally solidified Fe-3.08 pct C-2.01 pct Si alloy. The experimental results indicated that the morphology of primary dendrites in the Fe-C-Si system is very similar to those obtained in some transparent metal model systems and in some other metal systems. In order to study the morphological transition between cellular and dendritic growth, directionally solidified samples were quenched in cold water at various stages of solidification and the morphology was examined on the polished and etched surface. It has been found that when the growth velocity decreased from 326.6 to 0.8 μn/s, the average dendrite tip radius increased from 1.12 to 33.1 μm. At a growth velocity of about 0.65 μm/s, a transition from dendritic to cellular growth occurred. Models for dendritic growth proposed by various investigators have been briefly reviewed and compared with the present experimental results. Significant disagreements were found for some of the available theoretical models. Possible explanations have been given for these disagreements.

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Authors and Affiliations

  1. Department of Metallurgical and Materials Engineering, The University of Alabama, 35487, Tuscaloosa, AL

    Huameng Tian (Graduate Research Assistant) & Doru M. Stefanescu (University Research Professor and Director of Solidification Laboratory)

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  1. Huameng Tian
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  2. Doru M. Stefanescu
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Tian, H., Stefanescu, D.M. Dendritic growth during directional solidification of hypoeutectic Fe-C-Si alloys. Metall Trans A 23, 681–687 (1992). https://doi.org/10.1007/BF02801185

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  • DOI: https://doi.org/10.1007/BF02801185

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