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Development of Accident-Tolerant FeCrAl Steels Containing Al2O3 Particles by Means of Internal Al Oxidation

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Abstract

FeCrAl ferritic steels containing dispersed Al2O3 particles instead of Y2O3 or Ce2O3 particles were developed for accident-tolerant fuel cladding in light-water reactors. Forcible addition of only oxygen through mechanical alloying can create Al2O3 particles by precipitation during annealing above 973 K. The oxygen content was controlled to use oxidation of internal aluminum to form Al2O3 particles and increase the number density of Al2O3 particles with an average diameter of around 40 nm. The size and number density of Al2O3 particles are significantly affected by lattice misfit, and thus interfacial energy between Al2O3 particles and the matrix, and by aluminum solubility into the ferrite matrix. The estimated Al2O3 particle strengthening stress is consistent with measured tensile stress at 973 K. Both stresses are slightly improved with increasing oxygen content, but are half the level of that in steel strengthened by Ce2O3 and CeAlO3 particles.

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Acknowledgments

This work is supported by Grant-in-Aid for Scientific Research (B), 16H04529, Japan Society for the Promotion of Science (JSPS). The authors would like to thank the laboratory of Nano-Micro Material-Analysis in Hokkaido University for the utilizing of XRD, FIB and TEM.

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Authors and Affiliations

  1. Graduate School of Engineering, Hokkaido University, N13W8 Kita-ku, Sapporo, 060-8268, Japan

    Hiroki Shibata

  2. Faculty of Engineering, Hokkaido University, N13W8 Kita-ku, Sapporo, 060-8268, Japan

    Shigeharu Ukai, Naoko H. Oono & Shigenari Hayashi

  3. Nippon Nuclear Fuel Development Co., LTD, 2163 Narita-cho, Oarai-machi, Higashi-Ibaraki-gun, Ibaraki-ken, 311-1313, Japan

    Kan Sakamoto & Mutsumi Hirai

Authors
  1. Hiroki Shibata
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  2. Shigeharu Ukai
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  4. Shigenari Hayashi
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  5. Kan Sakamoto
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Correspondence to Hiroki Shibata.

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Manuscript submitted July 16, 2018.

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Shibata, H., Ukai, S., Oono, N.H. et al. Development of Accident-Tolerant FeCrAl Steels Containing Al2O3 Particles by Means of Internal Al Oxidation. Metall Mater Trans A 50, 1816–1824 (2019). https://doi.org/10.1007/s11661-019-05122-2

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  • DOI: https://doi.org/10.1007/s11661-019-05122-2

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