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The impact of dose rate on defect clustering and irradiation hardening in reactor pressure vessel steel under Fe ion irradiation

  • Metals & corrosion
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Abstract

The dose rate effect significantly impacts accelerated assessment experiments of the radiation resistance of critical structural materials in nuclear reactors. This study investigated the role of the dose rate on the irradiation hardening and defect cluster formation in a low-Cu reactor pressure vessel (RPV) steel A508-3 under 3.5 MeV Fe13+ ions irradiation at 290 °C, with chosen dose rates of 2.8 × 10–5, 1.4 × 10–4 and 2.8 × 10–4 dpa/s. Nano-indentation and atom probe tomography (APT) techniques were employed to characterize the mechanical property changes and defect clustering behavior, respectively. Nanoindentation results revealed that for a fixed dose, greater hardening was observed in the sample irradiated at a lower dose rate, and conversely, less hardening at a higher dose rate. APT results for samples with 3.0 dpa demonstrated that defect clusters exhibited characteristics of small size and low density under irradiation at a dose rate of 2.8 × 10–4 dpa/s, and large size and high density at a dose rate of 2.8 × 10–5 dpa/s. The ratio of solutes to Fe elements in a cluster also varied with changes in dose rate. The change in hardening, cluster size, number density and cluster composition suggested that the evolution of defect clusters was primarily driven by ballistic mixing, rather than radiation-enhanced diffusion, under heavy ions irradiation within the dose rate range of 2.8 × 10–5–2.8 × 10–4 dpa/s.

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Acknowledgements

This study is supported by the National Key Research and Development Programs of China (Grant No. 2022YFE03120001 and 2017YFB0702202). The authors gratefully acknowledge the operation team of the 320 kV platform for their help in the ion irradiation experiments.

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Authors and Affiliations

  1. Institute of Modern Physics, Chinese Academy of Sciences, No. 509 Nanchang Road, Lanzhou, 730000, China

    Yitao Yang, Chonghong Zhang, Jie Gou & Jianyang Li

  2. School of Nuclear Science and Technology, University of Chinese Academy of Sciences, Beijing, 100049, China

    Yitao Yang, Chonghong Zhang, Jie Gou & Jianyang Li

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YTY provided investigation, conceptualization, calculation, data curation, analysis, writing original draft and funding acquisition; CHZ performed resources, methodology, project administration and funding acquisition; JG did the investigation, data curation and analysis; JYL gave, investigation, data curation and analysis.

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Correspondence to Yitao Yang.

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Yang, Y., Zhang, C., Gou, J. et al. The impact of dose rate on defect clustering and irradiation hardening in reactor pressure vessel steel under Fe ion irradiation. J Mater Sci 59, 1056–1067 (2024). https://doi.org/10.1007/s10853-023-09253-1

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