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Morphology and Orientation Selection of Non-metallic Inclusions in Electrified Molten Metal

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Abstract

The effect of electric current on morphology and orientation selection of non-metallic inclusions in molten metal has been investigated using theoretical modeling and numerical calculation. Two geometric factors, namely the circularity (\( f_{c} \)) and alignment ratio (\( f_{e} \)) were introduced to describe the inclusions shape and configuration. Electric current free energy was calculated and the values were used to determine the thermodynamic preference between different microstructures. Electric current promotes the development of inclusion along the current direction by either expatiating directional growth or enhancing directional agglomeration. Reconfiguration of the inclusions to reduce the system electric resistance drives the phenomena. The morphology and orientation selection follow the routine to reduce electric free energy. The numerical results are in agreement with our experimental observations.

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Acknowledgments

The work was financially supported by EPSRC (EP/L00030X/1) and the Royal Society Newton Advanced Fellowship (NA150320).

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Authors and Affiliations

  1. School of Engineering & Innovation, The Open University, Walton Hall, Milton Keynes, MK7 6AA, UK

    Z. C. Zhao & R. S. Qin

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  1. Z. C. Zhao
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  2. R. S. Qin
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Correspondence to R. S. Qin.

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Manuscript submitted February 5, 2017.

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Zhao, Z.C., Qin, R.S. Morphology and Orientation Selection of Non-metallic Inclusions in Electrified Molten Metal. Metall Mater Trans B 48, 2781–2787 (2017). https://doi.org/10.1007/s11663-017-1028-3

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