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Long-term thermal-aging stability of oxide-dispersion-strengthened ferritic steels at 753 K

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Abstract

Oxide-dispersion-strengthened (ODS) ferritic steels are promising candidates for structural applications in the future nuclear reactors. The higher chromium contents of ODS ferritic steels, the better the corrosion resistance, which can meet the harsh corrosion environment of the advanced reactors. However, increasing the Cr content may also lead to the brittleness of the ODS steels when serving at high temperatures. The ODS ferritic steels with different Cr contents (12, 16 and 18 wt% Cr, respectively) were fabricated by mechanical alloying, hot isostatic pressing and forging. Mechanical properties and microstructure evolution of the ODS ferritic steels after aging at 753 K for 2000 h were investigated. It is found that both Vickers hardness and yield strength of 18%Cr ODS ferritic steel were strongly increased and the impact energy was decreased after aging at 753 K. In order to explore the reasons for changes in the mechanical properties, the fracture surfaces were characterized by scanning electron microscopy, and microstructures after aging were observed by transmission electron microscopy. The impact fracture of 18%Cr ODS ferritic steel belongs to quasi-cleavage facture, which is consistent with its very low impact energy. The grain size and dispersed oxide particles of different ODS steels are very stable. M23C6 carbide and M2C carbide were found in 12%Cr ODS steel and 16%Cr ODS steels, respectively.

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Acknowledgements

The authors would like to express their thanks for the financial support of National Magnetic Confinement Fusion Program of China under Grant No. 2015GB121006.

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Authors and Affiliations

  1. School of Materials Science and Engineering, University of Science and Technology Beijing, Beijing, 100083, China

    Shuai Xu, Zhang-jian Zhou, Shao-fu Li & Hao-dong Jia

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  1. Shuai Xu
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  2. Zhang-jian Zhou
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  3. Shao-fu Li
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Correspondence to Zhang-jian Zhou.

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Xu, S., Zhou, Zj., Li, Sf. et al. Long-term thermal-aging stability of oxide-dispersion-strengthened ferritic steels at 753 K. J. Iron Steel Res. Int. 25, 776–784 (2018). https://doi.org/10.1007/s42243-018-0110-7

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