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Influence of Silicon on Bainite Transformation in Ductile Iron; Relation to Mechanical Properties

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Abstract

Using a dilatometer the isothermal transformation of austenite to bainite has been studied in ductile cast iron with 0.05 % Mn and a silicon content varying from 2.4 to 3.8 %. The alloys were austenitized to a carbon content in the matrix of 0.65 %. It appears that silicon retards the formation of carbides in the upper bainite region (400 °C), resulting in an amount of retained austenite up to 40 % present in the final structure at room temperature. Silicon improves the strength; in the lower bainite region the yield strength in particular. An elongation up to 10 % or more is obtained after austempering at 400 °C independent of the silicon content.

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Authors and Affiliations

  1. Laboratorium voor Metaalkunde, Delft University of Technology, Delft, The Netherlands

    H. Nieswaag & J. W. Nijhof

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  1. H. Nieswaag
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  2. J. W. Nijhof
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Nieswaag, H., Nijhof, J.W. Influence of Silicon on Bainite Transformation in Ductile Iron; Relation to Mechanical Properties. MRS Online Proceedings Library 34, 411–422 (1984). https://doi.org/10.1557/PROC-34-411

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  • DOI: https://doi.org/10.1557/PROC-34-411

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