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Experimental Research on Tensile Behavior of Advanced High-Strength Steel DP600 at High Strain Rate

  • Junrui XuEmail author
  • Dong Cao
  • Junjia Cui
  • Xu Zhang
  • Guangyao Li
Article
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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.

Keywords

constitutive modeling dual-phase steel high strain rate tensile behavior 

Notes

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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Copyright information

© ASM International 2019

Authors and Affiliations

  • Junrui Xu
    • 1
    • 2
    • 3
    Email author
  • Dong Cao
    • 3
  • Junjia Cui
    • 4
  • Xu Zhang
    • 5
  • Guangyao Li
    • 4
  1. 1.School of Materials Science and EngineeringInner Mongolia University of TechnologyHohhotChina
  2. 2.State Key Laboratory of Solidification ProcessingNorthwestern Polytechnical UniversityXi’anChina
  3. 3.Key Laboratory of Welding Robot and Application Technology of Hunan ProvinceXiangtan UniversityXiangtanChina
  4. 4.State Key Laboratory of Advanced Design and Manufacturing for Vehicle Body, College of Mechanical and Vehicle EngineeringHunan UniversityChangshaChina
  5. 5.College of Mechanical and Electrical EngineeringHunan University of Science and TechnologyXiangtanChina

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