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Effects of processing variables on the microsegregation of directionally cast samples

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Abstract

An investigation into the effects of processing variables on the microsegregation of directionally cast samples of Cu-8 wt pct Sn alloys is presented. The samples were previously obtained in four different experimental conditions, which brought about different types of dendritic growth. Each sample had a cylindrical shape and was sectioned into transversal slices whose degree of microsegregation was measured by microprobe analyses and by quantitative metalography. A decrease in microsegregation along the longitudinal axis toward the cast sample surface was observed. This behavior was simulated by using a comprehensive microsegregation mathematical model and detailed thermal history of samples. Columnar and equiaxed regions of cylindrical samples were seen to have different levels of microsegregation, which might be the result of differences in interdendritic distances (ID), as shown by experimental evidence. It was also noticed that solute profiles calculated by a mathematical model and those obtained by microprobe analyses showed a better agreement if local dendrite arm spacing was considered in the calculations rather than an average spacing.

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Authors and Affiliations

  1. the Department of Metallurgical and Materials Engineering, University of São Paulo, CEP 05508-900, São Paulo, SP, Brazil

    Marcelo Aquino Martorano (Assistant Professor) & José Deodoro Trani Capocchi (Full Professor)

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  1. Marcelo Aquino Martorano
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  2. José Deodoro Trani Capocchi
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Martorano, M.A., Capocchi, J.D.T. Effects of processing variables on the microsegregation of directionally cast samples. Metall Mater Trans A 31, 3137–3148 (2000). https://doi.org/10.1007/s11661-000-0093-3

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  • DOI: https://doi.org/10.1007/s11661-000-0093-3

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