Phenomenological constitutive model and dynamic recrystallization behavior of 20CrMnTiH steel
GONG Qian-jiang1,2,3，4，LIANG Yi-long1,2,3，4 ，YANG Ming1,2,3，4，JIANG Yun1,2,3，4，XU Xiang1,2,3，4
（1. College of Materials and Metallurgy， University of Guizhou， Guiyang 550025， Guizhou， China 2. Key Laboratory for Material Structure and Strength of Guizhou Province， Guiyang 550025， Guizhou， China 3. Guizhou Key Laboratory of High Performance Metal Structure and Manufacture Technology， Guiyang 550025，Guizhou， China 4. National Local Co-construction Engineering Laboratory for High Performance Metal Structure Material and Manufacture Technology， Guiyang 550025， Guizhou， China）
Abstract：The high temperature hot deformation behavior of 20CrMnTiH steel at deformation temperature in the range of 850-1 150 ℃ and strain rate in the range of 0.01-10 s－1 was discussed by isothermal compression test on Gleeble-3800 thermal simulation test machine. The phenomenological constitutive equation and dynamic recrystallization model of 20CrMnTiH steel were established by mathematical regression method and thermodynamic irreversible principle， and the constitutive model compensated by strain was verified effectively. The true stress-strain curve showed that the deformation temperature and strain rate had significant effects on the deformation temperature and strain rate on 20CrMnTiH steel and exhibited positive strain rate sensitivity and negative temperature sensitivity. There was a good correlation[(R＝0.976 64)]between the calculated flow stress values and the experimental values， and the average relative error was 5.544 2%. In the hardening rate and flow stress curves， the critical stress σc and the critical strain εc value of dynamic recrystallization under different deformation conditions by single parameter method and solving the inflection point method have been obtained， and the critical stress and critical strain and Zener-Hollomon parameters of the mathematical model[(ε≥εc＝0.007 9lnZ－0.153 23)]were established， and the critical strain[εc]increased with the increase of temperature compensated strain rate factors[Z.]
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2017, Vol. 52 
