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Abstract
Submicroscopic particles in precipitation hardening superalloys are studied using extraction replica electron microscopy. Equations developed by McCall and Boyd to evaluate precipitate size, volume fraction, and interparticle spacing from extraction replica electron micrography were recently modified by Abrams to more accurately determine the volume of material from which the precipitate particles are extracted. This paper reviews the application of Abrams' modification to the study of gamma-prime precipitate in superalloys. The analytical approach of Abrams was found to be unsuited to superalloys which contain a large volume fraction precipitate of uniform size.
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