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| Hot Deformation Behavior of GCr15 Steel |
| PENG Ning-qi,TANG Guang-bo,YAO Jun,LIU Zheng-dong |
| Institute for Structural Materials, Central Iron and Steel Research Institute, Beijing 100081, China |
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Abstract Hot deformation behavior of GCr15 (ASTM 52100) steel was investigated using single-hit compression tests on Gleeble-1500 simulator at the temperature range of 850-1100 �� and strain rate range of 0. 1-10 s-1. The flow stress constitutive equation of GCr15 steel during hot deformation was determined by stress-strain curves analysis on the basis of the hyperbolic sine equation. And the models of dynamic recrystallization fraction and dynamic recrystallization grain size of GCr15 steel were established by the measured curves and microstructure observation in different experimental conditions. The mean activation energy and the time exponent of dynamic recrystallization kinetics equation in the range of experimental conditions were determined to be 356. 2 kJ/mol and 2. 12, respectively. Meanwhile, the flow stress model was also established by the method of allocating flow stress curve with three main stress values, the saturation stress, the steady state stress and the stress when strain is 0. 1. The flow stress curves predicted by the developed models under different deformation conditions are in good agreements with the measured ones.
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Received: 19 August 2011
Published: 02 April 2013
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| Fund:Sponsored by Project of Scientific and Technical Supporting Programs of China During the 11th Five-Year Plan |
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Corresponding Authors:
Guang-Bo TANG
E-mail: grant.tgb@163.com
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2013, Vol. 20 
