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| Constitutive equations and dynamic recrystallization behaviors of 20CrNi2Mo steel at stage of high temperature deformation |
| ZHANG Shi-wei1,2,3，YANG Ming1,2,3，LIANG Yi-long1,2,3，JIANG Yun2,3，LONG Shao-lei1,2,3 |
（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. National and Local Joint Engineering Laboratory for High-Performance Metal Structure Materials and Advanced Manufacturing Technology， Guiyang 550025， Guizhou， China） |
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Abstract The constitutive equation of the strain compensation and the dynamic recrystallization behavior of 20CrNi2Mo steel at temperatures ranging from 900 to 1 050 ℃ and stain rates from 0.001 to 1 s－1 were studied by isothermal single-pass compression tests carried out on DIL805A/T thermo-mechanical simulator，which can provide theoretical guidance for the plastic deformation behavior and organizational control of 20CrNi2Mo steel. The correlation[（R）] and the average relative error[（AARE）]are 0.992 1 and 3.019 2% respectively between the magnitudes of the flow stress calculated by the proposed model and the experimental results. The critical dynamic recrystallization model was established after the inflection points were solved by fitting a third order polynomial to the[θ-σ]curves. And the complexity of dynamic recrystallization was analyzed by microstructure of different deformation processes. Results show that the tested steel all recrystallized in this study. And the higher the deformation temperature and the smaller the strain rate，the more the dynamic recrystallization volume fraction was. The critical stress model and critical strain model for dynamic recrystallization of parameter[Z]was established.
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Received: 24 March 2017
Published: 28 July 2017
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2017, Vol. 52 
