Modeling of metadynamic recrystallization kinetics after hot deformation of low-alloy steel Q345B |
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Authors: | Bo Ma Yan Peng Yun-fei Liu and Bin Jia |
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Affiliation: | (1) Department of Metallurgical Engineering, Iran University of Science and Technology, P.O. Box 16844-13114, Tehran, Iran;(2) Department of Mechanical Engineering, Monash University, Clayton Campus, Melbourne, Victoria, 3800, Australia |
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Abstract: | Based on the steady-state strain measured by single-pass hot compression tests, the method by a double-pass hot compression
testing was developed to measure the metadynamic-recrystallization kinetics. The metadynamic recrystallization behavior of
low-alloy steel Q345B during hot compression deformation was investigated in the temperature range of 1 000–1 100 °C, the
strain rate range of 0.01–0.10 s?1 and the interpass time range of 0.5–50 s on a Gleeble-3500 thermo-simulation machine. The results show that metadynamic recrystallization
during the interpass time can be observed. As the deformation temperature and strain rate increase, softening caused by metadynamic
recrystallization is obvious. According to the data of thermo-simulation, the metadynamic recrystallization activation energy
is obtained to be Q
md=100.674 kJ/mol and metadynamic recrystallization kinetics model is set up. Finally, the error analysis of metadynamic recrystallization
kinetics model proves that the model has high accuracy (correlation coefficient R=0.988 6). |
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Keywords: | low-alloy steel kinetics model hot deformation metadynamic recrystallization activation energy |
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