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Growth temperatures and the limits of coupled growth in unidirectional solidification of Fe-C eutectic alloys

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Abstract

Growth temperature has been measured as a function of applied growth velocityV for grey (austenite-flake graphite) eutectic, austenite dendrites and white (austenite-cementite) eutectic in Fe-4.28 wt pct C at a temperature gradientG of ∼7 K/mm. Grey eutectic (0.4 to 65 µm/s) required an undercoolingΔTfor growth equal toK 1 V 1/2 withK 1 as 3.4 ± 0.1 Ks1/2/µm1/2, giving values ofΔT nearly an order of magnitude larger than predicted for growth at the extremum, as shown previously by Toloui and Hellawell for the related Al-Si eutectic. Austenite dendrites growing together with the grey eutectic atV between 11 and 65 µ m/s exhibited a range of tip temperatures giving rise to average undercoolings of magnitude [GD/V +K 2 Vn] withD as diffusion coefficient of carbon in the melt andK 2 as 0.73 Ksn µm−n withn as 0.46 predicted by Ivantsov’s theory for growth of an austenite needle. White eutectic displaced both grey eutectic and austenite dendrites atV of 100 µm/s. Except for the persistence of grey eutectic rather than white eutectic in the presence of austenite dendrites (11 <V < 65 µm/s), these observed growth transitions are consistent with the derived relationships governing growth temperatures on the basis of competitive growth,i.e. that the growth form with the highest growth temperature at a particularV should prevail. The results are then applied to derive the limiting conditions for growth of grey and white eutectics as a function of composition in Fe-C (i.e. their coupled zones). The significance of observed dependences onV of volume fraction and spacing of austenite dendrites is discussed.

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Authors and Affiliations

  1. University of Sheffield, Sheffield, England

    H. Jones (Senior Lecturer in Metallurgy)

  2. Department of Materials Engineering, Swiss Federal Institute of Technology, Lausanne, Switzerland

    W. Kurz (Professor of Physical Metallurgy)

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  1. H. Jones
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  2. W. Kurz
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Jones, H., Kurz, W. Growth temperatures and the limits of coupled growth in unidirectional solidification of Fe-C eutectic alloys. Metall Trans A 11, 1265–1273 (1980). https://doi.org/10.1007/BF02653480

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