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Growth of oxide particles in FeCrAl- oxide dispersion strengthened steels at high temperature

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Title: Growth of oxide particles in FeCrAl- oxide dispersion strengthened steels at high temperature
Authors: Oono, N.H. Browse this author
Ukai, S. Browse this author
Hayashi, S. Browse this author
Ohtsuka, S. Browse this author
Kaito, T. Browse this author
Kimura, A. Browse this author
Torimaru, T. Browse this author
Sakamoto, K. Browse this author
Issue Date: Sep-2017
Publisher: Elsevier
Journal Title: Journal of nuclear materials
Volume: 493
Start Page: 180
End Page: 188
Publisher DOI: 10.1016/j.jnucmat.2017.06.018
Abstract: The growth of oxide particles in FeCrAl-oxide dispersion strengthened steel (ODSS) considering an accident condition of the light-water reactor at above 1500 K was studied by using a high-temperature annealing. Oxide particles grew from 9 nm to more than 50 nm as maximum at 1623 K for 27 h, with decreasing their number density in two orders of magnitude. Most of the oxide particles in 15Cr-7Al were identified as YAM or YAP, while the oxide particles in 15Cr-7Al-0.4Zr were identified trigonal Y4Zr3O12. Zr addition to 15Cr-7Al ODSS accelerated the growth of the oxide particles, which is quite contrary to the effect of Zr addition during sintering as suggested in the literature. The kinetics of coarsening was characterized by an equation of Ostwald ripening. The diffusion activation energies obtained in the present materials were quite larger than the conventional diffusion activation energy of Y in alpha-iron. Gibbs free energy of oxides should be considered to discuss the coarsening. (C) 2017 Elsevier B.V. All rights reserved.
Rights: © 2017. This manuscript version is made available under the CC-BY-NC-ND 4.0 license
Type: article (author version)
Appears in Collections:工学院・工学研究院 (Graduate School of Engineering / Faculty of Engineering) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

Submitter: 大野 直子

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