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 2 000 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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Foundation Item: Item Sponsored by National High Technology Research and Development Program (863 Program) of China (2009AA03Z518); Basic Theory Research Fund of Engineering Research Institute of USTB of China (YJ2010-006)
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Song, Rb., Dai, Qf. Dynamic Deformation Behavior of Dual Phase Ferritic-Martensitic Steel at Strain Rates From 10−4 to 2000 s−1. J. Iron Steel Res. Int. 20, 48–53 (2013). https://doi.org/10.1016/S1006-706X(13)60140-5
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DOI: https://doi.org/10.1016/S1006-706X(13)60140-5