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Austempered Ductile Cast Irons–Influence of Microstructure Control

Published online by Cambridge University Press:  21 February 2011

R C. Voigt  and
C. R. Loper Jr.
R C. Voigt
Affiliation:
University of Kansas, Mechanical Engineering Department, Lawrence, KS 66045
C. R. Loper Jr.
Affiliation:
University of Wisconsin-Madison, 1509 University Avenue, Madison, WI 53706
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Abstract

The influence of microstructure on the properties of austempered ductile cast irons have been studied along with an analysis of the necessary process control to insure consistent properties. Both austempered ductile iron transformed at high temperatures with a matrix structure of carbide-free ferrite and substantial amounts of austenite, and austempered/bainitic ductile iron transformed at low temperatures with a more characteristic bainitic structure also containing austenite have been studied. The good toughness and ductility of these high strength ductile irons is due to the microplasticity associated with both the ferrite and austenite phases; however carbide precipitation during the later stages of austempering reduces room temperature toughness considerably and results in a change to a quasi-cleavage fracture mode. The influence of casting quality control and heat treatment control on the microstructures and properties obtained are discussed.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 34: Symposium – Physical Metallurgy of Cast Iron , 1984 , 377
Copyright
Copyright © Materials Research Society 1985

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References

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