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| Dynamic Deformation Behavior of Dual Phase Ferritic-Martensitic Steel at Strain Rates From 10-4 to 2000 s-1 |
| SONG Ren-bo,DAI Qi-feng |
| School of Materials Science and Engineering, University of Science and Technology Beijing, Beijing 100083, China |
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Abstract The deformation behavior of the dual phase steel (DP1000 steel) was studied by the quasi-static tensile experiment and the dynamic tensile experiment. The experiments were carried out at strain rates ranging from 10-4 to 2000 s-1 at room temperature. Then the stress-strain curves of DP1000 steel in the strain rate range of 10-4-2000 s-1 were measured. By introducing the strain rate sensitivity factor m, Zerilli-Armstrong model was optimized. The constitutive equation parameters which formulate the mechanical behavior of DP1000 steel were fitted based on the Johnson-Cook (JC) constitutive model and the optimized Zerilli-Armstrong (ZA) constitutive model, respectively. By comparing indicators of ��accuracy-of-fit��, R2 terms, for the two models, the optimized Zerilli-Armstrong constitutive model can reflect plastic deformation behavior both at the low and high strain rates more accurately. The reasons why the optimized Zerilli-Armstrong constitutive model is more advantageous than the Johnson-Cook model were discussed by using the yield strength and ultimate tensile strength (UTS) versus strain rates, and strain hardening rate versus effective plastic strain analytical methods.
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Received: 20 March 2012
Published: 23 August 2013
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| Fund:National High Technology Research and Development Program of China;Basic Theory Research Fund of Engineering Research Institute of USTB |
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2013, Vol. 20 
