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A high-strength heterogeneous structural dual-phase steel

  • Metals & corrosion
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Abstract

The strengthening and ductilization of steels are of great importance to weight reduction of vehicles. In this work, the strength–ductility synergy of dual-phase (DP) steels was obtained by properly tailoring the structural heterogeneity, including the distribution and fraction of constituent phases. It was demonstrated that heterogeneous structural DP steels with high volume fraction of martensite (from 64 to 83%) led to a good combination of strength and ductility. Compared with the cold-rolled sheets, the tensile strength and uniform elongation of heterogeneous DP steel increased by 700 MPa (from 1.06 to 1.76 GPa) and 2.7% (from 1.3 to 4%), respectively. The contributions from back stress and effective stress were analyzed by cyclic loading–unloading experiments. The underlying deformation mechanism was discussed based on the results of mechanical test and microstructure observation.

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Acknowledgements

This work is supported by the National Key R&D Program of China (Grant Number 2017YFA0204403), the National Natural Science Foundation of China (Grant Numbers 51601094 and 51601003) and the Fundamental Research Funds for the Central Universities (Grant Number 30918011342). Q.L. thanks Fundamental Research Funds for the Central Universities (Grant Number 30917011106) for the financial support. The authors thank the Materials Characterization and Research Center of Nanjing University of Science and Technology and the Jiangsu Key Laboratory of Advanced Micro & Nano Materials and Technology for the support.

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Authors and Affiliations

  1. Nano and Heterogeneous Materials Center, School of Materials Science and Engineering, Nanjing University of Science and Technology, Nanjing, 210094, China

    Bo Gao, Zhiyi Pan, Jiansheng Li, Yang Cao, Lirong Xiao & Hao Zhou

  2. State Key Laboratory of Nonlinear Mechanics, Institute of Mechanics, Chinese Academy of Sciences, Beijing, 100190, China

    Xuefei Chen & Yan Ma

  3. School of Engineering Science, University of Chinese Academy of Sciences, Beijing, 100049, China

    Xuefei Chen & Yan Ma

  4. Herbert Gleiter Institute of Nanoscience, Nanjing University of Science and Technology, Nanjing, 210094, China

    Qingquan Lai

  5. School of Materials Science and Engineering, Jiangsu University, Zhenjiang, 212013, China

    Manping Liu

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  1. Bo Gao
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  2. Xuefei Chen
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  3. Zhiyi Pan
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  8. Qingquan Lai
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Correspondence to Qingquan Lai or Lirong Xiao.

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Gao, B., Chen, X., Pan, Z. et al. A high-strength heterogeneous structural dual-phase steel. J Mater Sci 54, 12898–12910 (2019). https://doi.org/10.1007/s10853-019-03785-1

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