Abstract
We conducted a series of experimental investigations on the mechanical properties of DP600 dual-phase steel under strain rates from 0.001 to 3000 s−1 at room temperature. A split Hopkinson tensile bar was used to capture a high strain rate response. A comparison of the quasi-static and dynamic experiment results showed that the yield strength and ultimate tensile strength increased significantly under dynamic conditions. Fractographs were analyzed by scanning electron microscopy, which indicated a better ductility at a high strain rate. Based on the experimental results, the Johnson–Cook constitutive model was applied to describe the tensile deformation behavior under various strain rates. A reasonable agreement was observed between the experimental data and the Johnson–Cook model. A metallographic analysis of tensile specimens showed that the average ferritic grain size of the fractured specimens at a high strain rate was smaller than that of the fractured specimens under quasi-static conditions. Ferritic grain refinement proved that high-speed forming could enhance the forming ability of the DP600 steel.
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Acknowledgment
This work was supported by National Natural Science Foundation of China (No. 51405412), Province Natural Science Foundation of Hunan (No. 2018JJ2398), the State Key Laboratory of Material Processing and Die & Mould Technology (No. P2018-019), and the State Key Laboratory of Solidification Processing in NWPU (No. SKLSP201856). We thank Laura Kuhar, PhD, from Liwen Bianji, Edanz Group China (www.liwenbianji.cn/ac), for editing the English text of a draft of this manuscript.
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Xu, J., Cao, D., Cui, J. et al. Experimental Research on Tensile Behavior of Advanced High-Strength Steel DP600 at High Strain Rate. J. of Materi Eng and Perform 28, 2411–2420 (2019). https://doi.org/10.1007/s11665-019-04008-z
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DOI: https://doi.org/10.1007/s11665-019-04008-z