1 College of Mechanical and Electrical Engineering, Hunan University of Science and Technology, Xiangtan 411201, Hunan, China 2 Hunan Provincial Key Laboratory of High Efficiency and Precision Machining of Difficult-to-Cut Material, Hunan University of Science and Technology, Xiangtan 411201, Hunan, China 3 School of Mechanical Engineering, Shanghai Jiao Tong University, Shanghai 200240, China
Dynamic mechanical behavior of ultra-high strength steel 30CrMnSiNi2A at high strain rates and elevated temperatures
1 College of Mechanical and Electrical Engineering, Hunan University of Science and Technology, Xiangtan 411201, Hunan, China 2 Hunan Provincial Key Laboratory of High Efficiency and Precision Machining of Difficult-to-Cut Material, Hunan University of Science and Technology, Xiangtan 411201, Hunan, China 3 School of Mechanical Engineering, Shanghai Jiao Tong University, Shanghai 200240, China
ժҪ During high speed machining in the field of manufacture, chip formation is a severe plastic deformation process including large strain, high strain rate and high temperature. And the strain rate in high speed cutting process can be achieved to 105 s-1. 30CrMnSiNi2A steel is a kind of important high-strength low-alloy structural steel with wide application range. Obtaining the dynamic mechanical properties of 30CrMnSiNi2A under the conditions of high strain rate and high temperature is necessary to construct the constitutive relation model for high speed machining. The dynamic compressive mechanical properties of 30CrMnSiNi2A steel were studied using split Hopkinson pressure bar (SHPB) tests at 30-700��C and 3000-10000 s-1. The stress-strain curves of 30CrMnSiNi2A steel at different temperatures and strain rates were investigated, and the strain hardening effect and temperature effect were discussed. Experimental results show that 30CrMnSiNi2A has obvious temperature sensitivity at 300��C. Moreover, the flow stress decreased significantly with the increase of temperature. The strain hardening effect of the material at high strain rate is not significant with the increase of strain. The strain rate hardening effect is obvious with increasing the temperature. According to the experimental results, the established Johnson-Cook (J-C) constitutive model of 30CrMnSiNi2A steel could be used at high strain rate and high temperature.
Abstract��During high speed machining in the field of manufacture, chip formation is a severe plastic deformation process including large strain, high strain rate and high temperature. And the strain rate in high speed cutting process can be achieved to 105 s-1. 30CrMnSiNi2A steel is a kind of important high-strength low-alloy structural steel with wide application range. Obtaining the dynamic mechanical properties of 30CrMnSiNi2A under the conditions of high strain rate and high temperature is necessary to construct the constitutive relation model for high speed machining. The dynamic compressive mechanical properties of 30CrMnSiNi2A steel were studied using split Hopkinson pressure bar (SHPB) tests at 30-700��C and 3000-10000 s-1. The stress-strain curves of 30CrMnSiNi2A steel at different temperatures and strain rates were investigated, and the strain hardening effect and temperature effect were discussed. Experimental results show that 30CrMnSiNi2A has obvious temperature sensitivity at 300��C. Moreover, the flow stress decreased significantly with the increase of temperature. The strain hardening effect of the material at high strain rate is not significant with the increase of strain. The strain rate hardening effect is obvious with increasing the temperature. According to the experimental results, the established Johnson-Cook (J-C) constitutive model of 30CrMnSiNi2A steel could be used at high strain rate and high temperature.
��������:National High Technology Research and Development Program of China
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Qiulin Niu
E-mail: qlniu2009@163.com
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Qiu-lin Niu,,Wei-wei Ming,Ming Chen,Si-wen Tang,,Peng-nan Li,. Dynamic mechanical behavior of ultra-high strength steel 30CrMnSiNi2A at high strain rates and elevated temperatures[J]. �й������ڿ���, 2017, 24(7): 724-729.
Qiu-lin Niu,,Wei-wei Ming,Ming Chen,Si-wen Tang,,Peng-nan Li,. Dynamic mechanical behavior of ultra-high strength steel 30CrMnSiNi2A at high strain rates and elevated temperatures. Chinese Journal of Iron and Steel, 2017, 24(7): 724-729.
2017, Vol. 24 
