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Oxide particle coarsening at temperature over 1473 K in 9CrODS steel

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Title: Oxide particle coarsening at temperature over 1473 K in 9CrODS steel
Authors: Oono, N. Browse this author
Nakamura, K. Browse this author
Ukai, S. Browse this author →KAKEN DB
Kaito, T. Browse this author
Torimaru, T. Browse this author
Kimura, A. Browse this author
Hayashi, S. Browse this author
Issue Date: Dec-2016
Publisher: Elsevier
Journal Title: Nuclear materials and energy
Volume: 9
Start Page: 342
End Page: 345
Publisher DOI: 10.1016/j.nme.2016.06.008
Abstract: The oxide particle coarsening was evaluated at temperature over 1473 K by means of transmission electron microscopy (TEM). After annealing of the 9CrODS extruded bar, the size of oxide particles increases while the number density decreases, indicating that the oxide particles coarsen through Ostwald ripening. The growth rate of the oxide particles follows the fifth-power law, which is in the region of dislocation 'pipe' diffusion. The activation energy for pipe diffusion, however, was remarkably high, derived as 891 KJ/mole. The stability of oxide particles and the difference of the diffusion velocity in between bcc-delta phase and fcc-gamma phase should be considered as the contributions to the activation energy.
Type: article
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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