Effects of titanium concentration and tungsten addition on the nano-mesoscopic structure of high-Cr oxide dispersion strengthened (ODS) ferritic steels

Peng Dou, Akihiko Kimura, Ryuta Kasada, Takanari Okuda, Masaki Inoue, Shigeharu Ukai, Somei Ohnuki, Toshiharu Fujisawa, Fujio Abe

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23 Citations (Scopus)

Abstract

To study the effects of titanium concentration and tungsten addition on the nano-mesoscopic structure of high-Cr oxide dispersion strengthened (ODS) ferritic steels, the spatial and size distributions, shape, and coherency of the oxide particles in SOC-5 (Fe-15.95Cr-0.09Ti-0.34Y2O3) and SOC-P3 (Fe-13.32Cr-1.9W-0.16Ti-0.33Y2O3) were studied by diffraction contrast techniques, including weak beam electron microscopy. When the titanium concentration is increased from 0.09 to 0.16 wt.% with 1.9 wt.% W added, the grain size decreases considerably, while the number density and mean size of the oxide particles significantly increases and decreases, respectively. ∼63.5% and ∼96% of the oxide particles in SOC-5 and SOC-P3 (diameter <4.5 nm), respectively, are coherent with the bcc steel matrix. In SOC-5, ∼36% of the oxide particles (4.5-10 nm in diameter) are semi-coherent; misfit moiré fringes are seen across only ∼12% of the oxide particles with misfit moiré fringe spacing of 1.12 nm, indicating the misfit strain is 0.11. However, only ∼4% of the oxide particles in SOC-P3 (4.5-10 nm in diameter) are semi-coherent; misfit moiré fringes are seen across only ∼2% of the oxide particles with misfit moiré fringe spacing of 0.98 nm, indicating the misfit strain is 0.126. The mean misfit strain of coherent oxide particles in SOC-5 is ∼0.017.

Original languageEnglish
Pages (from-to)S95-S100
JournalJournal of Nuclear Materials
Volume442
Issue number1-3 SUPPL.1
DOIs
Publication statusPublished - 2013 Jun 5
Externally publishedYes

ASJC Scopus subject areas

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

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