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Graphite Inoculants For Gray Cast Iron

Published online by Cambridge University Press:  21 February 2011

C. R. Loper Jr. ,
S. Shirvani  and
T. H. Witter
C. R. Loper Jr.
Affiliation:
Professor, Department of Metallurgical and Mineral Engineering, The University of Wisconsin-Madison, Madison, WI, U.S.A.
S. Shirvani
Affiliation:
Research Assistant, Department of Metallurgical and Mineral Engineering, The University of Wisconsin-Madison, Madison, WI, U.S.A.
T. H. Witter
Affiliation:
Superior Graphite Company, Chicago, Illinois, U.S.A.
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Abstract

The ability of graphitic materials to serve as inoculants during the solidification of flake graphite cast irons has been examined and related to the physical structure of these materials. Carbon dissolution in cast iron melts is reviewed relative to dissolution rates and carbon recovery obtained from a variety of materials. Maximum dissolution rates and carbon recovery are shown to be attained with high purity carbon products, where the ash present does not form a network structure as carbon enters solution, and where the sulfur content of the carbon product is low.

Successful inoculation requires that the carbon product be graphitic, or possess a high degree of graphiticity, and that the solution rate be controlled so that the substrate graphite is present in the molten iron at the time of graphite formation during solidification. The characteristics of inoculants whereby this controlled solution rate can be achieved are discussed.

Inoculation with graphitic materials is shown to be effective in flake graphite cast irons, but is not effective in spheroidal or compacted/vermicular graphite cast irons. Factors contributing to this effect are discussed.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 34: Symposium – Physical Metallurgy of Cast Iron , 1984 , 89
Copyright
Copyright © Materials Research Society 1985

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References

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