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| Plastic Deformation Characteristics of 20CrMnTiH Gear Steel under High Temperature |
| HU Cheng-Liang, ZHANG Ying, ZHAO Zhen, LI Shi-Long, ZHI Yue-Sheng |
| (National Engineering Research Center of Die & Mold CAD, Shanghai Jiaotong University, Shanghai 200030, China) |
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Abstract Taking the 20CrMnTiH gear steel as an object, under the condition of deformation temperature of 850 °C-1 150 °C and strain rate 0.01 s-1-10 s-1, different high temperature compression tests were carried out to investigate its plastic deformation characteristics. The flow stress under 850 °C is 2 to 3 times the stress under 1 150 °C, and the stress at strain rate 10 s-1 is 2 to 3 times the stress at strain rate 0.01 s-1. Under high temperature and low strain rate, the phenomenon of continuous dynamic recrystallization (CDRX) takes place. From the microstructure, the recrystallized grains along initial grain boundaries grow and new grains generate with the increase of deformation temperature, and the grains grow up significantly because of CDRX when the temperature is 1 050 °C. The hot deformation activation energy of the steel is 371.053 kJ/mol. Based on the processing map, the optimum processing parameters of hot deformation are obtained, that is, the deformation temperature is 1 020 °C-1 150 °C and the strain rate is 0.5 s-1-2.5 s-1.
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Received: 01 March 2012
Published: 30 October 2012
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