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

  • Shuai Xu
  • Zhang-jian Zhou
  • Shao-fu Li
  • Hao-dong Jia
Original Paper
  • 48 Downloads

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.

Keywords

Oxide-dispersion-strengthened ferritic steel Aging stability Mechanical property Microstructure 

Notes

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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Copyright information

© China Iron and Steel Research Institute Group 2018

Authors and Affiliations

  • Shuai Xu
    • 1
  • Zhang-jian Zhou
    • 1
  • Shao-fu Li
    • 1
  • Hao-dong Jia
    • 1
  1. 1.School of Materials Science and EngineeringUniversity of Science and Technology BeijingBeijingChina

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