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| CONSTITUTIVE RELATIONSHIPS OF Nb MICROALLOYED STEEL DURING HIGH TEMPERATURE DEFORMATION |
| JIA Bin, PENG Yan |
| State Key Laboratory of Metastable Materials Science and Technology, Engineering Research Center of Rolling Equipment and Complete Technology of Ministry of Education, Yanshan University, Qinhuangdao 066004 |
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Cite this article:
JIA Bin PENG Yan. CONSTITUTIVE RELATIONSHIPS OF Nb MICROALLOYED STEEL DURING HIGH TEMPERATURE DEFORMATION. Acta Metall Sin, 2011, 47(4): 507-512.
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Abstract The flow stress curves of Nb microalloyed steel Q345B during hot compression deformation were obtained on Gleeble-3500 thermo-simulation machine. Based on the experimental results, the constitutive model of Nb microalloyed steel during high temperature deformation was established to describe the stress-strain relationship during dynamic softening (dynamic recovery and dynamic recrystallization) and in the steady flow state, in which the influences of the thermal deformation parameters (strain rate and deformation temperature) and dynamic softening mechanism (dynamic recovery and dynamic recrystallization) on the flow stress were considered. A method was provided to solve constitutive equation and establish the mathematic expressions of the correlation coefficients. It is shown that the predicted results by the model are in good agreement with the experimental ones.
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Received: 13 January 2011
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| Fund: Supported by High Technology Research and Development Program of China (No.2009AA04Z143) and Program for New Century Excellent Talents in
University (No.NCET-09-0117) |
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