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The columnar to equiaxed transition of horizontal unsteady-state directionally solidified Al-Si alloys

Carvalho, Diego B. ; Moreira, Antonio L. ; Moutinho, Daniel J. ; M. Filho, José ; Rocha, Otávio L. ; Spinelli, José E.

Materials research (São Carlos, São Paulo, Brazil), 2014-04, Vol.17 (2), p.498-510 [Periódico revisado por pares]

ABM, ABC, ABPol

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Título:
The columnar to equiaxed transition of horizontal unsteady-state directionally solidified Al-Si alloys
Autor: Carvalho, Diego B. ; Moreira, Antonio L. ; Moutinho, Daniel J. ; M. Filho, José ; Rocha, Otávio L. ; Spinelli, José E.
Assuntos: Al-Si alloys ; Alloys ; Aluminum base alloys ; columnar to equiaxed transition ; Cooling rate ; Directional solidification ; ENGINEERING, CHEMICAL ; Heat transfer coefficients ; Horizontal ; Intermetallic compounds ; MATERIALS SCIENCE, MULTIDISCIPLINARY ; METALLURGY & METALLURGICAL ENGINEERING ; Solidification ; Temperature gradient ; thermal parameters ; unsteady-state conditions
É parte de: Materials research (São Carlos, São Paulo, Brazil), 2014-04, Vol.17 (2), p.498-510
Notas: ObjectType-Article-1
SourceType-Scholarly Journals-1
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content type line 23
Descrição: Experiments were conducted to investigate the influence of thermal parameters on the columnar to equiaxed transition during the horizontal unsteady-state directional solidification of Al-Si alloys. The parameters analyzed include the heat transfer coefficients, growth rates, cooling rates, temperature gradients and composition. A combined theoretical and experimental approach is developed to determine the solidification thermal variables considered. The increasing solute content in Al-Si alloys was not found to affect significantly the experimental position of the CET which occurred for cooling rates in the range between 0.35 and 0.64 K/s for any of three alloy compositions examined. A comparative analysis between the results of this work and those from the literature proposed to analyze the CET during upward vertical solidification of Al-Si alloys is reported and the results have shown that the end of the columnar region during horizontal directional solidification is abbreviated as a result of about six times higher thermal gradient than that verified during upward unidirectional solidification of alloys investigated.
Editor: ABM, ABC, ABPol
Idioma: Inglês;Português;Espanhol

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The columnar to equiaxed transition of horizontal unsteady-state directionally solidified Al-Si alloys

Carvalho, Diego B. ; Moreira, Antonio L. ; Moutinho, Daniel J. ; M. Filho, José ; Rocha, Otávio L. ; Spinelli, José E.

ABM, ABC, ABPol

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