Abstract
The enhanced mechanical properties of oxide dispersion-strengthened (ODS) steels are mainly due to the high density of homogeneously distributed oxide inclusions. It is well known that some alloying elements, such as Ti, V, and Al, play an important role in the formation of oxides/nanoclusters and influence the density and size of these inclusions. In this paper, a wide range of ODS steels containing different alloying elements were studied. The microstructural analysis was performed using transmission electron microscopy and atom probe tomography. Different types of inclusions were found in the steels: oxides of the Y–Ti–O or Y–Al–O types with sizes of ~2–15 nm, and nanoclusters (2–5 nm) enriched in Y, O, and Cr, as well as Ti, V, and Al, when these elements were present in the material. It was shown that oxides made the main contribution to the steel strengthening, while the cluster contribution was comparable with that of oxides only in Austenitic ODS and 14Cr ODS steels.
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ACKNOWLEDGMENTS
We are grateful to Dr. P. Vladimirov at the Karlsruhe Institute of Technology (Germany), Professor A. Kimura at the University of Kyoto (Japan) and Dr. T.K. Kim (Republic of Korea) at the Korea Atomic Energy Research Institute for providing ODS steel specimens.
Funding
This work was supported by the Russian Science Foundation, project no. 17-19-01696. The equipment of the KAMIKS Shared Access Center (http://kamiks.itep.ru/) at the Alikhanov Institute for Theoretical and Experimental Physics, National Research Center Kurchatov Institute, was used for the APT analysis. The equipment of the NANOZOND Resource Center, National Research Center Kurchatov Institute (http://www.rc.nrcki.ru/pages/-main/nanozond/), was used for specimen preparation by the FIB methods and analysis by the TEM methods.
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Rogozhkin, S.V., Khomich, A.A., Bogachev, A.A. et al. Comprehensive Analysis of Nanostructure of Oxide Dispersion Strengthened Steels as Prospective Materials for Nuclear Reactors. Phys. Atom. Nuclei 83, 1425–1433 (2020). https://doi.org/10.1134/S1063778820100191
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DOI: https://doi.org/10.1134/S1063778820100191