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| Constitutive Model for High Temperature PlasticDeformation of Low Carbon Steel |
| JIN Zhaoyang1,2,CUI Zhenshan1 |
| (1. National Die & Mold CAD Engineering Research Center, Shanghai Jiaotong University, Shanghai 200030, China; 2. School of Mechanical Engineering, Yangzhou University, Yangzhou 225001, China) |
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Abstract Based on the analysis of hot deformation behavior, a twostage constitutive model of low carbon steel was developed. In the model, the effect of work hardening and dynamic recovery on the flow stress is described by a onestructure parameter model (dislocation evolution model); the softening effect of dynamic recrystallization is expressed by the Avrami equation. The model parameters are identified by using the experimental stressstrain curves obtained from the hot compressive deformation on Gleeble1500 thermosimulation machine, and then the variation of model parameters with deformation condition are investigated. The calculated flow stress curves agree well with the measured ones, which indicates that the developed constitutive model is applicable to the hot deformation process numerical simulation of the investigated low carbon steel.
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Received: 24 August 2009
Published: 29 April 2010
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