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Characterization of the microstructure and phase equilibria calculations for the powder metallurgy superalloy IN100

Published online by Cambridge University Press:  31 January 2011

Agnieszka M. Wusatowska-Sarnek ,
Gautam Ghosh ,
Gregory B. Olson ,
Martin J. Blackburn  and
Mark Aindow
Agnieszka M. Wusatowska-Sarnek*
Affiliation:
Department of Metallurgy and Materials Engineering, Institute of Materials Science, University of Connecticut, Storrs, Connecticut 06269-3136
Gautam Ghosh
Affiliation:
Department of Materials Science and Engineering, Northwestern University, Evanston, Illinois 60208-3108
Gregory B. Olson
Affiliation:
Department of Materials Science and Engineering, Northwestern University, Evanston, Illinois 60208-3108
Martin J. Blackburn
Affiliation:
Department of Metallurgy and Materials Engineering, Institute of Materials Science, University of Connecticut, Storrs, Connecticut 06269-3136
Mark Aindow
Affiliation:
Department of Metallurgy and Materials Engineering, Institute of Materials Science, University of Connecticut, Storrs, Connecticut 06269-3136
*
a)Address all correspondence to this author. Present address: Pratt & Whitney, 400 Main Street M/S 114-40, East Hartford, CT 06108. e-mail: wusatoa@pweh.com
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Abstract

The microstructure of the Ni-based superalloy IN100 processed by a powder metallurgy route was evaluated to reveal the structures, volume fractions, distributions, and chemistries of the various phases present. These data were compared with those predicted by computational thermodynamics. It is shown that the microstructural parameters expected on the basis of global equilibrium conditions differ significantly from those measured experimentally. However, modification of these calculations by use of constrained and successive equilibria compensated for kinetic effects and led to accurate (or better) predictions of phase volume fractions and chemistries in this alloy. This demonstrated that such modified phase equilibria calculations could be powerful tools for modeling microstructures, even in complex multicomponent alloys processed under nonequilibrium conditions.

Type
Articles
Information
Journal of Materials Research , Volume 18 , Issue 11 , November 2003 , pp. 2653 - 2663
Copyright
Copyright © Materials Research Society 2003

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References

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