Journal of Materials Science

, Volume 54, Issue 11, pp 8786–8799 | Cite as

Precipitation of various oxides in ODS ferritic steels

  • N. H. OonoEmail author
  • S. Ukai
  • K. Tominaga
  • N. Ebisawa
  • K. Tomura


The reactive elements (Ti, Al and Zr) have been widely used for the improvement of the strength or the oxide resistance of ODS steels. In the present work, we studied the effect of the reactive elements on the precipitation of oxide particles, especially focusing upon the appropriate amount of the oxide composing elements, by addition of the large amounts of Y2O3 and reactive elements. The mechanically alloyed powders are annealed in a wide temperature range from 773 to 1423 K and then analysed by various analysis methods (small-angle X-ray scattering and X-ray diffraction by synchrotron radiation X-ray, scanning transmission electron microscope combined with energy dispersion X-ray spectroscopy, high-resolution transmission microscopy and 3D-atom probe). Ti, Al and Zr enhanced the growth of oxide particles, opposite to the many studies of Ti- and Zr-added ODS steels, as a result of the addition of Y2O3 and these elements ten times larger than those for usual use. The nucleation and growth of oxide particles are discussed by simulating the critical radius of nucleation and the growth based on the LSW theory. Y4Zr3O12 is stable and easy to precipitate even at lower annealing temperature. All reactive elements enhance the growth of oxide particles because of their big molar volume as compared to that of Y2O3.



This study was supported by MEXT/JSPS KAKENHI Grant Number JP26820325. The synchrotron radiation experiments were performed at the BL19B2 of SPring-8 with the approval of the Japan Synchrotron Radiation Research Institute (JASRI) (Proposal No. 2015A1669); the SAXS and XRD measurements were supported by M. Satou and K. Osaka, respectively. 3DAP analysis was carried out at the International Research Center for Nuclear Materials Science, Institute for Materials Research, Tohoku University. The TEM works were conducted at “Joint-use Facilities: Laboratory of Nano-Micro Material Analysis”, Hokkaido University, supported by “Nanotechnology Platform” Program of the Ministry of Education, Culture, Sports, Science and Technology (MEXT), Japan.

Supplementary material

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Supplementary material 1 (PDF 53 kb)


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Authors and Affiliations

  1. 1.Faculty, Graduate School and School of EngineeringHokkaido UniversitySapporoJapan
  2. 2.International Research Center for Nuclear Materials Science, Institute for Materials ResearchTohoku UniversityOaraiJapan

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