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Experimental and theoretical analysis of equilibrium segregation and radiation-induced segregation of Cr at grain boundaries in a reduced activation ferritic/martensitic (RAFM) steel

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Abstract

Helium ion irradiation at 350 °C was performed to study equilibrium segregation and radiation-induced segregation (RIS) of Cr at grain boundaries in reduced activation ferritic/martensitic steels. Cr concentration at grain boundary was measured by scanning transmission electron microscopy with an energy-dispersive spectrometer. The measured Cr concentration at grain boundaries in heat treated zone was 11.7 and 12.8 wt.% in irradiated zone, respectively, which matched well to the calculated results from Mclean and modified Perk model. Equilibrium segregation and RIS of Cr mechanisms were theoretically analysed. The analysis indicates that as temperature rises, equilibrium Cr segregation decreases monotonically, while RIS of Cr has a bell-shape profile, which increases first and then decreases. It is also shown that at low and high temperatures, equilibrium segregation of Cr is higher than that of RIS; at intermediate temperatures, equilibrium Cr segregation is lower than RIS.

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Acknowledgements

C. Zhang acknowledges financial support from the National Natural Science Foundation of China (Grant No. 51771097), Tsinghua University Initiative Scientific Research Program, the National Key Research and Development Plan (Grant No. 2017YFB0305201) and the Science Challenge Project (Grant No. TZ2018004). The authors acknowledge the help from 1300 kV ECR experimental platform in the National Laboratory of Heavy-ion Accelerators in Lanzhou, China.

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Authors and Affiliations

  1. Key Laboratory of Advanced Materials of Ministry of Education, School of Materials Science and Engineering, Tsinghua University, Beijing, 100084, China

    Li-dong Xia, Hao Chen, Zhi-gang Yang & Chi Zhang

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  1. Li-dong Xia
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  2. Hao Chen
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  3. Zhi-gang Yang
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  4. Chi Zhang
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Correspondence to Chi Zhang.

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Xia, Ld., Chen, H., Yang, Zg. et al. Experimental and theoretical analysis of equilibrium segregation and radiation-induced segregation of Cr at grain boundaries in a reduced activation ferritic/martensitic (RAFM) steel. J. Iron Steel Res. Int. 28, 445–452 (2021). https://doi.org/10.1007/s42243-020-00484-z

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  • DOI: https://doi.org/10.1007/s42243-020-00484-z

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