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Numerical analysis of the rapid solidification of gas-atomized Al-8 Wt Pct Fe droplets

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Abstract

A numerical analysis of the microstructural evolution of microcellular and cellular α-Al phase in gas-atomized Al-8 wt pct Fe droplets was represented. The two-dimensional (2-D) non-Newtonian heat transfer and the dendritic growth theory in the undercooled melt were combined, assuming a point nucleation on the droplet surface and the macroscopically smooth solid-liquid interface enveloping the cell tips. It reproduced the main characteristic features of the reported microstructures quite well and predicted a considerable volume fraction of thermal dendritic growth region in a droplet smaller than 10 μm if an initial undercooling was larger than 100 K. The volume fractions of the microcellular region, gA, and the sum of the microcellular and cellular region, gα, were predicted as functions of the heat-transfer coefficient, h, and the initial undercooling, ΔT. It was shown that gA and gα, in the typical atomization processes with h = 0.1 to 1.0 W/C.M2K, are dominated by ΔT and h, respectively, but for h larger than 4.0 W/C.M2 K, a fully microcellular structure can be obtained irrespective of the initial undercooling.

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Authors and Affiliations

  1. Solidified Materials Research Center in CNU and the Department of Materials Science and Engineering, Kunsan National University, 573-360, Kunsan, Korea

    Seong-Gyoon Kim (Associate Professor)

  2. Central Research Institute, Sammi Steel Corp., 641-370, Changwon, Korea

    Sung-Ho Shin (Senior Researcher)

  3. Department of Metallurgy, University of Tokyo, 113, Tokyo, Japan

    Toshio Suzuki (Associate Professor) & Takateru Umeda (Professor)

Authors
  1. Seong-Gyoon Kim
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  2. Sung-Ho Shin
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  3. Toshio Suzuki
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  4. Takateru Umeda
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Kim, SG., Shin, SH., Suzuki, T. et al. Numerical analysis of the rapid solidification of gas-atomized Al-8 Wt Pct Fe droplets. Metall Mater Trans A 25, 2815–2826 (1994). https://doi.org/10.1007/BF02649231

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  • DOI: https://doi.org/10.1007/BF02649231

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