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Impurity-Induced Changes in Interfacial Strength and Their Role in Creep Fracture

Published online by Cambridge University Press:  26 February 2011

E.P. George  and
D.P. Pope
E.P. George
Affiliation:
Oak Ridge National Laboratory, Metals and Ceramics Division, P.O. Box 2008, Oak Ridge, TN 37831–6093
D.P. Pope
Affiliation:
University of Pennsylvania, Department of Materials Science and Engineering, Philadelphia, PA 19104–6272
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Abstract

Creep cavity nucleation at second phase particles in iron and steel is examined in the light of recent theoretical and experimental results. Theoretical considerations show it to be extremely unlikely that thermal nucleation will occur at Fe3C, FeO or A1203 particles, or that athermal nucleation will take place at Fe3C particles. Consistent with this, it is experimentally found that carbides and oxides almost never nucleate cavities in iron and steel, as long as harmful impurities like sulfur are not present. In the presence of segregated impurities like sulfur, oxides do nucleate cavities, but there is insufficient data to determine whether this is because the impurities make thermal or athermal nucleation easier. Finally, sulfides are thought to be nonwetting in iron and steel. As a result, there should be no barrier to thermal nucleation at sulfides, and experiments show that sulfides do nucleate cavities with great ease in iron and steel.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 122: Symposium I – Interfacial Structure, Properties, and Design , 1988 , 391
Copyright
Copyright © Materials Research Society 1988

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