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Study on microstructural evolution and constitutive modeling for hot deformation behavior of a low-carbon RAFM steel

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Abstract

The constitutive equation was established based on the consideration of strain compensation to describe the hot deformation behavior of low carbon reduced activation ferritic/martensitic (RAFM) steels at the temperatures of 850–1050 °C and the strain rates of 0.01–10 s−1. The result indicates that the flow stress is increased with the increase of strain rate but decreased with increase of deformation temperature. During the hot deformation process, the increase of temperature is beneficial to attain the complete dynamic recrystallization (DRX). However, excessively high temperature leads to grow up of dynamic recrystallized grain. Higher strain rate leads to finer recrystallized grains. The material constants (α, n, A) and deformation activation energy (Q) are calculated by the regression analysis. The increase of strain caused the decrease of Q, indicating the DRX occurred more easily. In addition, the developed constitutive equation could accurately predict the hot deformation behavior of the low carbon RAFM steel.

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ACKNOWLEDGMENTS

The authors are grateful to the China National Funds for Distinguished Young Scientists (granted No. 51325401), the National Natural Science Foundation of China (granted No. 51501126), the National Magnetic Confinement Fusion Energy Research Program (granted No. 2015GB119001), and the Key Project of Natural Science Foundation of Tianjin (granted No. 14JCZDJC38700) for grant and financial support.

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  1. State Key Lab of Hydraulic Engineering Simulation and Safety, School of Materials Science & Engineering, Tianjin University, Tianjin, 300350, People’s Republic of China

    Jianguo Chen, Yongchang Liu, Chenxi Liu, Xiaosheng Zhou & Huijun Li

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  1. Jianguo Chen
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  2. Yongchang Liu
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  3. Chenxi Liu
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Correspondence to Chenxi Liu.

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Chen, J., Liu, Y., Liu, C. et al. Study on microstructural evolution and constitutive modeling for hot deformation behavior of a low-carbon RAFM steel. Journal of Materials Research 32, 1376–1385 (2017). https://doi.org/10.1557/jmr.2017.77

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