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Hot Deformation Behavior of SA508GR. 4N Steel for Nuclear Reactor Pressure Vessels

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Abstract

A hot compression experiment (1073–1473 K, strain rates of 0.001–10 s−1) of SA508GR. 4N low alloy steel was performed using a Gleeble–3800 thermal-mechanical simulator, and the hot deformation behavior of the steel was investigated by analyzing both the true stress-true strain curves and its microstructures. The thermal deformation equation and hot deformation activation energy (Q) of SA508GR. 4N steel were obtained by regression with a classic hyperbolic sine function. The hot processing map of SA508GR. 4N steel was also established. An empirical equation for the stress peak was described for practical applications. The SA508GR. 4N steel showed a critical Zener-Hollomon parameter (lnZc) for dynamic recrystallization (DRX) of 37.44, below which full DRX may occur. The sensitivity of the SA508GR. 4N steel increased linearly with test temperature, such that higher temperatures led to enhanced workability.

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Authors and Affiliations

  1. Faculty of Materials Science and Engineering, Kunming University of Science and Technology, 650093, Kunming, Yunnan, China

    Ning Liu (Doctor Candidate) & Zheng-dong Liu (Doctor, Professor)

  2. Institute for Special Steels, Central Iron and Steel Research Institute, 100081, Beijing, China

    Ning Liu (Doctor Candidate), Zheng-dong Liu (Doctor, Professor), Xi-kou He (Doctor, Senior Engineer), Zhi-qiang Yang & Long-teng Ma

Authors
  1. Ning Liu
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  2. Zheng-dong Liu
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  3. Xi-kou He
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  4. Zhi-qiang Yang
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  5. Long-teng Ma
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Corresponding authors

Correspondence to Ning Liu, Zheng-dong Liu or Xi-kou He.

Additional information

Foundation Item: Item Sponsored by National Energy Application Technology Research and Engineering Demonstrative Project of China (NY201501)

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Liu, N., Liu, Zd., He, Xk. et al. Hot Deformation Behavior of SA508GR. 4N Steel for Nuclear Reactor Pressure Vessels. J. Iron Steel Res. Int. 23, 1342–1348 (2016). https://doi.org/10.1016/S1006-706X(16)30197-2

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  • DOI: https://doi.org/10.1016/S1006-706X(16)30197-2

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