Abstract
The hot deformation behavior of an ultralow-carbon microalloyed steel was investigated using an MMS-200 thermal simulation test machine in a temperature range of 1 073–1 373 K and strain rate range of 0.01–10 s−1. The results show that the flow stress decreases with increasing deformation temperature or decreasing strain rate. The strain-compensated constitutive model based on the Arrhenius equation for this steel was established using the true stress-strain data obtained from a hot compression test. Furthermore, a new constitutive model based on the Z-parameter was proposed for this steel. The predictive ability of two constitutive models was compared with statistical measures. The results indicate the new constitutive model based on the Z-parameter can more accurately predict the flow stress of an ultralow-carbon microalloyed steel during hot deformation. The dynamic recrystallization (DRX) nucleation mechanism at different deformation temperatures was observed and analyzed by transmission electron microscopy (TEM), and strain-induced grain boundary migration was observed at 1 373 K/0.01 s−1.
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Funded by the Fundamental Research Funds for the Central Universities (Nos. HEUCFP201731 and HEUCFP201719), and the “One Three Five” Equipment Pre-research National Defense Science and Technology Key Laboratory Fund (No. KZ42180125)
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Li, N., Huang, Y., Han, R. et al. Constitutive Modeling and Dynamic Recrystallization Mechanisms of an Ultralow-carbon Microalloyed Steel During Hot Compression Tests. J. Wuhan Univ. Technol.-Mat. Sci. Edit. 35, 946–957 (2020). https://doi.org/10.1007/s11595-020-2341-2
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DOI: https://doi.org/10.1007/s11595-020-2341-2