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

Published online by Cambridge University Press:  21 February 2011

H. Nieswaag  and
J. W. Nijhof
H. Nieswaag
Affiliation:
Laboratorium voor Metaalkunde, Delft University of Technology, The Netherlands
J. W. Nijhof
Affiliation:
Laboratorium voor Metaalkunde, Delft University of Technology, The Netherlands
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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 0C independent of the silicon content.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 34: Symposium – Physical Metallurgy of Cast Iron , 1984 , 411
Copyright
Copyright © Materials Research Society 1985

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References

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