Stability of nanoscale secondary phases in an oxide dispersion strengthened Fe-12Cr alloy Articles uri icon

publication date

  • June 2011

start page

  • 3927

end page

  • 3936

issue

  • 10

volume

  • 59

International Standard Serial Number (ISSN)

  • 1359-6454

abstract

  • Disponible: http://dx.doi.org/10.1016/j.actamat.2011.03.017 Abstract: Transmission electron microscopy and atom-probe tomography were used to characterize on a near-atomic scale the microstructure and oxide and carbide phases that form during thermo-mechanical treatments of a model oxide dispersion strengthened Fe-12 wt.% Cr-0.4 wt.% Y(2)O(3) alloy. It was found that some of the Y-rich nanoparticles retained their initial crystallographic structure but developed a Cr-enriched shell, while others evolved into ternary oxide phases during the initial processing. The Y- and Cr-rich oxide phases formed remained stable after annealing at 1023 K for 96 h. However, the number of Cr-rich carbides appeared to increase, inducing Cr depletion in the matrix.

keywords

  • ods ferritic steel; nanoparticles; transmission electron microscopy; atom-probe tomography