APFIM study of multicomponent M2C carbide precipitation in AF1410 steel

G. B. Olson*, T. J. Kinkus, J. S. Montgomery

*Corresponding author for this work

Research output: Contribution to journalArticle

28 Scopus citations

Abstract

The development of fine-scale multicomponent M2C carbides in AF1410 steel was observed as a function of time at the standard tempering temperature of 510°C. Strong departures from equilibrium compositions are observed at early stages of precipitation, and carbide composition appears to be particle size dependent in a given microstructure. Analysis of the carbide composition trajectory during precipitation in terms of the thermodynamic contributions of coherency and capillarity indicates initial nucleation at compositions of reduced interfacial energy but reduced chemical driving force. The ability of multicomponent carbides to follow a precipitation composition trajectory of increasing interfacial energy and increasing driving force appears important to the maintenance of a fine particle size and high number density at late stages of precipitation for overaging resistance. Preliminary evidence is also found for predicted nonuniformity of the matrix composition in the stress field of a coherent particle.

Original languageEnglish (US)
Pages (from-to)238-245
Number of pages8
JournalSurface Science
Volume246
Issue number1-3
DOIs
StatePublished - Apr 3 1991

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Surfaces and Interfaces
  • Surfaces, Coatings and Films
  • Materials Chemistry

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