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Type: Artigo de periódico
Title: The columnar to equiaxed transition during the horizontal directional solidification of Sn-Pb alloys
Author: Silva, JN
Moutinho, DJ
Moreira, AL
Ferreira, IL
Rocha, OL
Abstract: Experiments have been carried out to analyze the columnar to equiaxed transition during the horizontal directional solidification of Sn-Pb hypoeutectic alloys as a function of solidification parameters, heat transfer coefficients, temperature gradients, growth rates, cooling rates and composition C.. For this purpose, a water-cooled solidification experimental apparatus was developed, and specimens were solidified under unsteady state heat flow conditions. A combined theoretical and experimental approach is developed to quantitatively determine the solidification thermal variables considered. The results have supported a criterion proposed based on a critical value of cooling rate which for a particular binary alloy system is independent of the solute concentration in the hypoeutectic range. The observation of the macrostructures has indicated that the columnar-to-equiaxed transition occurred in a zone rather than in a sharp plane parallel to the chill wall and that resulting thermo-solutal convection seems to favor the structural transition which occurs for a critical cooling rate of about 0.048 K/s and temperature gradients in the range between 0.25 and 0.90 K/mm for any of four alloy compositions examined. A comparative analysis between some results of this work and those from the literature proposed to analyze the CET during upward and downward vertical solidification of Sn-Pb hypoeutectic alloys is conducted. (C) 2008 Elsevier B.V. All rights reserved.
Subject: Columnar to equiaxed transition
Horizontal directional solidification
Sn-Pb alloys
Country: Suíça
Editor: Elsevier Science Sa
Rights: fechado
Identifier DOI: 10.1016/j.jallcom.2008.11.026
Date Issue: 2009
Appears in Collections:Unicamp - Artigos e Outros Documentos

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