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| Constitutive Equation for High Temperature Flow Behavior of 55SiMnMo Bainite Steel |
| YAN Tao1,2, YU En-lin1,2, ZHAO Yu-qian3 |
1. National Engineering Research Center for Equipment and Technology of Cold Strip Rolling,Yanshan University, Qinhuangdao 066004, Hebei, China
2. College of Mechanical Engineering,Yanshan University, Qinhuangdao 066004, Hebei, China
3. School of Control Engineering,Northeastern University at Qinhuangdao, Qinhuangdao 066004, Hebei, China |
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Abstract The high temperature flow behavior of 55SiMnMo bainite steel was studied by hot compression test at temperatures of 950-1100℃ with strain rates of 0.01-10s-1 using Gleeble-3500 thermal-simulation machine. Experimental results show that peak stress increases with decreasing of deformation temperature and increasing of strain rate; dynamic recrystallization of 55SiMnMo steel occurs with strain rate=0.01s-1 and=0.1s-1, deformation temperature t≥1000℃. According to the experimental results, the influence of hot deformation processing parameter (strain, strain rate and deformation temperature) on flow stress was analyzed. A constitutive equation of 55SiMnMo bainite steel during high temperature deformation was established to describe the stress-strain relationship by considering compensation of strain rate. The reliability of the model was verified by the comparison between the predicted flow stress curves by the model and the experimental data.
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Received: 04 December 2012
Published: 16 September 2013
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2013, Vol. 48 
