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A Study of Austempered Ductile Cast Iron

Published online by Cambridge University Press:  21 February 2011

J. D. Verhoeven ,
A. El Nagar ,
B. El Sarnagawa ,
D. P. Cornwell  and
F. Laabs
J. D. Verhoeven
Affiliation:
Dept. MSE and Ames Laboratory, Iowa State University, Ames, Iowa, 50011, USA
A. El Nagar
Affiliation:
Dept. Met., Military Techn. College, Cairo, Egypt
B. El Sarnagawa
Affiliation:
Dept. Met., Military Techn. College, Cairo, Egypt
D. P. Cornwell
Affiliation:
Dept. MSE and Ames Laboratory, Iowa State University, Ames, Iowa, 50011, USA
F. Laabs
Affiliation:
Dept. MSE and Ames Laboratory, Iowa State University, Ames, Iowa, 50011, USA
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Abstract

Experiments were carried out on unalloyed ductile cast iron to evaluate the % retained austenite (%RY) and its lattice parameter as a function of austenitizing time and temperature for austempering temperatures ranging from 270 to 420°C. Results are related to expected carbon levels in the gamma iron matrix at the austenitizing temperature. It is shown that the rate of austenitization can be described as a two step process and experiments demonstrate that 900°C austenitizatlon is complete after 8m. An 1100°C homogenizatdon has been shown to have a small effect upon %RY and rate of austenitization.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 34: Symposium – Physical Metallurgy of Cast Iron , 1984 , 387
Copyright
Copyright © Materials Research Society 1985

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References

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