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First Stage Graphitization of Subcritically Treated White Cast Iron

Published online by Cambridge University Press:  21 February 2011

A. A. Hussein ,
L. I. El-Menawati ,
M. A. Kassem  and
B. I. Yostos
A. A. Hussein
Affiliation:
Professor and Associate Professor respectively, Department of Metallurgy, Faculty of' Engineering, Cairo University, Giza, Egypt.
L. I. El-Menawati
Affiliation:
Professor and Associate Professor respectively, Department of Metallurgy, Faculty of' Engineering, Cairo University, Giza, Egypt.
M. A. Kassem
Affiliation:
Assistant Lecturer and Professor respectively, Department of Metallurgy, Faculty of Mining and Petroleum Engineering, Suez Canal University, Suez, Egypt.
B. I. Yostos
Affiliation:
Assistant Lecturer and Professor respectively, Department of Metallurgy, Faculty of Mining and Petroleum Engineering, Suez Canal University, Suez, Egypt.
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Abstract

The kinetics of first stage graphitization was studied in white cast irons of different compositions. These irons were presubjected to various isothermal anneals at 300–500°C, after being step-quenched from the intercritical (austenite and carbide) region. As a consequence of such pretreatment, the kinetics of post first stage graphitization were substantially accelerated. Both light and scanning electron metallography hive indicated that such acceleration arises due to the creation of vast areas of austenite/carbide interfaces upon cooling to and during subcritical transformations. These interfaces act as favourable nucleation sites for graphite and additionally they provide shorter diffusion paths for carbon. The latter also allows faster growth of graphite nodules. Effects of varying Si and Hn contents of the cast iron were determined. The practical significance of such treatment in providing] faster malleabilization and uniform distribution of graphite nodules is thus evident.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 34: Symposium – Physical Metallurgy of Cast Iron , 1984 , 315
Copyright
Copyright © Materials Research Society 1985

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References

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