Hot Deformation Behavior of SA508Gr.4N Steel for Reactor Pressure Vessels
YANG Zhi-qiang1, LIU Zheng-dong1, HE Xi-kou1, LIU Ning1,2
1. Institute for Special Steels, Central Iron and Steel Research Institute, Beijing 100081, China;
2. Faculty of Material Science and Engineering, Kunming University of Science and Technology, Kunming 650093, China
Abstract：The high-temperature plastic deformation and dynamic recrystallization behavior of SA508Gr.4N steel were investigated through hot deformation tests in a Gleeble1500D thermal mechanical simulator. The compression tests were performed in the temperature range of 1050-1250℃ and the strain rate range of 0.001-0.1s-1 with true strain of 0.16. The results show that from the high-temperature true stress-strain curves of the SA508Gr.4N steel, the main feature is dynamic recrystallization,and the peak stress increases with the decrease of deformation temperature or the increase of strain rate, indicating the experimental steel is temperature and strain rate sensitive material. The constitutive equation for SA508Gr.4N steel is established on the basis of the true stress-strain curves, and exhibits the characteristics of the high-temperature flow behavior quite well, while the activation energy of the steel is determined to be 383.862kJ/mol. Furthermore, an inflection point is found in the θ-σ curve, while the -dθ/dσ-σ curve shows a minimum value. The critical strain increases with increasing strain rate and decreasing deformation temperature. A linear relationship between critical strain (εc) and peak strain (εp) is found and could be expressed as εc/εp=0.517. The predicted model of critical strain could be described as εc=8.57×10-4Z0.148.
杨志强, 刘正东, 何西扣, 刘宁. 反应堆压力容器用SA508Gr.4N钢的热变形行为[J]. 材料工程, 2017, 45(8): 88-95.
YANG Zhi-qiang, LIU Zheng-dong, HE Xi-kou, LIU Ning. Hot Deformation Behavior of SA508Gr.4N Steel for Reactor Pressure Vessels. Journal of Materials Engineering, 2017, 45(8): 88-95.
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2017, Vol. 45 
