Evaluation of microstructural parameters of oxide dispersion strengthened steels from X-ray diffraction profiles

Svetlana Vlasenko, Andrei Benediktovitch, Tatjana Ulyanenkova, Vladimir Uglov, Vladimir Skuratov, Jacques O'Connell, Johannes Neethling

Research output: Contribution to journalArticle

3 Citations (Scopus)

Abstract

The microstructural parameters of oxide dispersion strengthened (ODS) steels from measured diffraction profiles were evaluated using an approach where the complex oxide nanoparticles (Y2Ti2O7 and Y4Al2O9) are modeled as spherical inclusions in the steel matrix with coherent or incoherent boundaries. The proposed method enables processing of diffraction data from materials containing spherical inclusions in addition to straight dislocations, and taking into account broadening due to crystallite size and instrumental effects. The parameters of crystallite size distribution modeled by a lognormal distribution function (the parameters m and σ), the strain anisotropy parameter q, the dislocation density ρ, the dislocation arrangement parameter M, the density of oxide nanoparticles ρnp and the nanoparticle radius r0 were determined for the ODS steel samples. The results obtained are in good agreement with the results of transmission electron microscopy (TEM).

Original languageEnglish
Pages (from-to)139-146
Number of pages8
JournalJournal of Nuclear Materials
Volume470
DOIs
Publication statusPublished - 1 Mar 2016

ASJC Scopus subject areas

  • Nuclear and High Energy Physics
  • Materials Science(all)
  • Nuclear Energy and Engineering

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