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Microstructure Evolution and Mechanical Properties of HR3C Steel during Long-term Aging at High Temperature

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Abstract

Microstructure evolution and the changes in mechanical properties of HR3C steel during long-term aging at 650, 700 and 750 °C were investigated. The precipitated phases of the aging steel included M23C6 carbides, Z-phase and a trace amount of Nb(C,N). The M23C6 carbides were distributed mainly at the grain boundary, while Z-phase was mainly inside the grains. Amounts of both M23C6 carbides and Z-phase during the aging process increased with increasing aging period and temperature. Coarsening of M23C6 carbides was influenced significantly by aging time and temperature, while the size of the Z-phase was relatively less affected by the aging time and temperature, which had a steady strengthening effect. Coarsening of the M23C6 carbides was the main reason for the decline in high temperature yield strength during long-term aging at 750 °C. The M23C6 carbides were linked into a continuous chain along the grain boundary which accounted for the decrease of toughness during aging.

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Authors and Affiliations

  1. Institute of Structural Materials, China Iron and Steel Research Institute Group, Beijing, 100081, China

    Bin Wang (Doctor), Zheng-dong Liu, Shi-chang Cheng, Chun-ming Liu & Jing-zhong Wang

  2. School of Materials and Metallurgy, Northeastern University, Shenyang, Liaoning, 110004, China

    Bin Wang (Doctor)

Authors
  1. Bin Wang
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  2. Zheng-dong Liu
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  3. Shi-chang Cheng
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  4. Chun-ming Liu
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  5. Jing-zhong Wang
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Correspondence to Bin Wang.

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Foundation Item: Item Sponsored by National High-Tech Research and Development Program (863 Program) of China (2012AA03A501)

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Wang, B., Liu, Zd., Cheng, Sc. et al. Microstructure Evolution and Mechanical Properties of HR3C Steel during Long-term Aging at High Temperature. J. Iron Steel Res. Int. 21, 765–773 (2014). https://doi.org/10.1016/S1006-706X(14)60139-4

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  • DOI: https://doi.org/10.1016/S1006-706X(14)60139-4

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