Atomic resolution imaging of precipitate transformation from cubic TaN to tetragonal CrTaN

Hilmar Kjartansson Danielsen, John Hald, Marcel A. J. Somers

    Research output: Contribution to journalJournal articleResearchpeer-review

    Abstract

    In 9–12% Cr creep-resistant steels Cr(V,Nb,Ta)N Z-phase is known to replace metastable (V,Nb,Ta)N MN precipitates at high temperatures. The precipitation process of Z-phase does not follow the classical nucleation theory, where dissolving MN particles provide constituents for Z-phase nucleation in the matrix. Using atomic resolution transmission electron microscopy, the current work demonstrates that metastable cubic TaN precipitates in a complex steel gradually transform compositionally and crystallographically into stable tetragonal CrTaN precipitates under the influence of Cr indiffusion from the steel matrix.
    Original languageEnglish
    JournalScripta Materialia
    Volume66
    Issue number5
    Pages (from-to)261-264
    ISSN1359-6462
    DOIs
    Publication statusPublished - 2012

    Keywords

    • Heat-resistant steels
    • Nitrides
    • High-resolution electron microscopy (HREM)
    • Crystal structure
    • Phase transformations

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