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Dynamic recrystallization behavior and kinetics of high strength steel

  • Materials, Metallurgy, Chemical and Environmental Engineering
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Abstract

The dynamic recrystallization behavior of high strength steel during hot deformation was investigated. The hot compression test was conducted in the temperature range of 950-1150 °C under strain rates of 0.1, 1 and 5 s-1. It is observed that dynamic recrystallization (DRX) is the main flow softening mechanism and the flow stress increases with decreasing temperature and increasing strain rate. The relationship between material constants (Q, n, α and lnA) and strain is identified by the sixth order polynomial fit. The constitutive model is developed to predict the flow stress of the material incorporating the strain softening effect and verified. Moreover, the critical characteristics of DRX are extracted from the stress-strain curves under different deformation conditions by linear regression. The dynamic recrystallization volume fraction decreases with increasing strain rate at a constant temperature or decreasing deformation temperature under a constant strain rate. The kinetics of DRX increases with increasing deformation temperature or strain rate.

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Correspondence to Guang-liang Wu  (吴光亮).

Additional information

Foundation item: Project(51322405) supported by the National Natural Science Foundation of China; Project(CX2013B085) supported by Hunan Provincial Innovation Foundation for Postgraduate, China

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Wu, Gl., Zhou, Cy. & Liu, Xb. Dynamic recrystallization behavior and kinetics of high strength steel. J. Cent. South Univ. 23, 1007–1014 (2016). https://doi.org/10.1007/s11771-016-3149-2

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  • DOI: https://doi.org/10.1007/s11771-016-3149-2

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