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Segregation of Alloying Elements on Small-Angle Grain Boundaries in Ferritic-Martensitic Steels under Ion Irradiation

  • MATERIALS OF POWER ENGINEERING AND RADIATION-RESISTANT MATERIALS
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Inorganic Materials: Applied Research Aims and scope

Abstract

Segregation of chemical elements was studied in ferritic-martensitic steels RUSFER-EK-181 and ChS-139—promising structural materials for fast neutron reactor core. To simulate the radiation effects, Fe ions with an energy of 5.6 MeV at temperatures of 250–400°C to damage doses of ~6 dpa and at temperatures of 350–450°C to a damage dose of 30 dpa were used. RUSFER-EK-181 steel was also studied after thermal aging at 450°C for 5000 h. Z-contrast analysis of the irradiated steels revealed the segregation of alloying elements on dislocations at small-angle tilt and mixed grain boundaries. Atom probe tomography of the ion-irradiated ChS-139 steel showed that clusters enriched in Ni, Si, and Mn were formed on the dislocations, including dislocations of small-angle grain boundaries. Clusters enriched in Si were formed on dislocations in the RUSFER-EK-181 steel. In the aged state of RUSFER-EK-181 steel, segregation of Cr, V, Mn, Si, and N was shown at dislocations of the small-angle grain boundary. The calculated misorientation angles of the small-angle grain boundaries were ~1°–3°, and the twist angle of the mixed boundary was ~3°.

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ACKNOWLEDGMENTS

The irradiation of samples and tomographic atom probe analysis were performed on the equipment of the KAMIKS Shared Access Center (http://kamiks.itep.ru/) of the National Research Center Kurchatov Institute—ITEP; preparation of samples by focused ion beam methods was performed on the equipment of the Resource Center NANOZOND of the National Research Center Kurchatov Institute (http://www.rc.nrcki.ru/pages/main/nanozond/).

Funding

This study was supported by a grant of the Russian Science Foundation, project no. 17-19-01696.

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Authors and Affiliations

  1. Institute for Theoretical and Experimental Physics named by A.I. Alikhanov of National Research Centre “Kurchatov Institute”, 117218, Moscow, Russia

    S. V. Rogozhkin, N. A. Iskandarov, A. A. Nikitin, A. A. Khomich, V. V. Khoroshilov, A. A. Bogachev, A. A. Lukyanchuk, O. A. Raznitsyn, A. S. Shutov, T. V. Kulevoy, P. A. Fedin, A. A. Potekhin & A. G. Zaluzhnyi

  2. National Research Nuclear University MEPhI, 115409, Moscow, Russia

    S. V. Rogozhkin, A. A. Potekhin & A. G. Zaluzhnyi

Authors
  1. S. V. Rogozhkin
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  2. N. A. Iskandarov
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  3. A. A. Nikitin
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  4. A. A. Khomich
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  5. V. V. Khoroshilov
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  6. A. A. Bogachev
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  7. A. A. Lukyanchuk
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  8. O. A. Raznitsyn
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  9. A. S. Shutov
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  10. T. V. Kulevoy
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  11. P. A. Fedin
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  12. A. A. Potekhin
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  13. A. G. Zaluzhnyi
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Correspondence to S. V. Rogozhkin.

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Translated by K. Gumerov

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Rogozhkin, S.V., Iskandarov, N.A., Nikitin, A.A. et al. Segregation of Alloying Elements on Small-Angle Grain Boundaries in Ferritic-Martensitic Steels under Ion Irradiation. Inorg. Mater. Appl. Res. 11, 1103–1109 (2020). https://doi.org/10.1134/S2075113320050275

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  • DOI: https://doi.org/10.1134/S2075113320050275

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