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

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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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