Hot Deformation Behavior of SA508GR.4N Steel for Nuclear Reactor Pressure Vessels
Ning LIU1,2,Zheng-dong LIU1,2,Xi-kou HE2,Zhi-qiang YANG2,Long-teng MA2
1. Faculty of Materials Science and Engineering, Kunming University of Science and Technology, Kunming 650093,Yunnan, China 2. Institute for Special Steels, Central Iron and Steel Research Institute, Beijing 100081, China
Hot Deformation Behavior of SA508GR.4N Steel for Nuclear Reactor Pressure Vessels
Ning LIU1,2,Zheng-dong LIU1,2,Xi-kou HE2,Zhi-qiang YANG2,Long-teng MA2
1. Faculty of Materials Science and Engineering, Kunming University of Science and Technology, Kunming 650093,Yunnan, China 2. Institute for Special Steels, Central Iron and Steel Research Institute, Beijing 100081, China
ժҪ 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.
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.
��������:National Energy Application Technology Research and Engineering Demonstrative Project of China
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E-mail: zhengdong@nercast.com
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Ning LIU,,Zheng-dong LIU,,Xi-kou HE,Zhi-qiang YANG,Long-teng MA. Hot Deformation Behavior of SA508GR.4N Steel for Nuclear Reactor Pressure Vessels[J]. �й������ڿ���, 2016, 23(12): 1342-1348.
Ning LIU,,Zheng-dong LIU,,Xi-kou HE,Zhi-qiang YANG,Long-teng MA. Hot Deformation Behavior of SA508GR.4N Steel for Nuclear Reactor Pressure Vessels. Chinese Journal of Iron and Steel, 2016, 23(12): 1342-1348.