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Nanoindentation Study of the Effect of Low-Temperature Ion Irradiation on the Hardness of a Ferritic–Martensitic EK-181 Steel

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Abstract

The hardness of a ferritic–martensitic steel EK-181 after ion irradiation to a maximum damaging dose of ~50 dpa in the temperature range 250–400°C is investigated. Nanoindentation is used to measure the mechanical properties. The hardnesses of the layer damaged by ions and that of the undamaged bulk material are found. At temperatures below 300°C, softening at a dose below 10 dpa and hardening at high doses of ~50 dpa are observed. Hardening is detected over the entire dose range at 400°C. The maximum hardness of the sample irradiated to ~50 dpa at 400°C is 1.7 GPa.

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ACKNOWLEDGMENTS

Irradiation and atom-probe tomography analysis were performed at the Center of the Collaborative Access KAMIKS (http://kamiks.itep.ru), Institute for Theoretical and Experimental Physics, National Research Center Kurchatov Institute; nanoindantation was carried out at the Technological Institute for Superhard and Novel Carbon Materials (http://www.tisncm.ru/suec/suec.html).

FUNDING

This work was supported by the Russian Scientific Foundation, project no. 17-19-01696.

Author information

Correspondence to A. A. Nikitin.

Additional information

Translated by T. Gapontseva

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Nikitin, A.A., Rogozhkin, S.V., Kulevoi, T.V. et al. Nanoindentation Study of the Effect of Low-Temperature Ion Irradiation on the Hardness of a Ferritic–Martensitic EK-181 Steel. Russ. Metall. 2019, 1184–1189 (2019). https://doi.org/10.1134/S0036029519110077

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Keywords:

  • ferritic–martensitic steel
  • ion irradiation
  • radiation damage simulation
  • hardness
  • nanoindentation