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Characterization of hot deformation behavior of 30Si2MnCrMoVE low-alloying ultra-high-strength steel by constitutive equations and processing maps

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Abstract

Isothermal compression tests of as-forged 30Si2MnCrMoVE low-alloying ultra-high-strength steel were carried out on a Gleeble 3500 thermal simulator at the deformation temperatures of 950–1150 °C and strain rates of 0.01–10 s−1. Based on the classical stress–dislocation density relationship and the kinematics of the dynamic recrystallization, the constitutive equations of the work hardening dynamical recovery period and dynamical recrystallization period were developed by using the work hardening curve and Avrami equation, which shows good agreement with the experimental value. Processing maps at the strain of 0.90 were constructed based on dynamic material model and were analyzed combined with microstructure observation under different conditions. The optimum parameter based on the processing maps was obtained and verified by a supplementary experiment. The power dissipation maps and instability maps at strains of 0.05–0.90 were also constructed, and the evolution law was analyzed in detail. The established constitutive equation and hot processing maps can provide some guidance for hot working process.

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Acknowledgements

This work was supported by the Shaanxi Key Research and Development Program (No. S2017-ZDYF-ZDXM-GY-0115), Natural Science Basic Research Plan in Shaanxi Province of China (No. 2017JM5010) and Fundamental Research Funds for the Central Universities of China (No. 3102019ZX004).

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Authors and Affiliations

  1. School of Materials Science and Engineering, Northwestern Polytechnical University, Xi’an, 710072, Shaanxi, China

    Hai Wang, Dong Liu, Jian-guo Wang, Hai-ping Wang, Yang Hu & Hao-dong Rao

  2. State Key Laboratory of Solidification Processing, Northwestern Polytechnical University, Xi’an, 710072, Shaanxi, China

    Hai Wang

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  1. Hai Wang
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  2. Dong Liu
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  3. Jian-guo Wang
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Correspondence to Dong Liu.

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Wang, H., Liu, D., Wang, Jg. et al. Characterization of hot deformation behavior of 30Si2MnCrMoVE low-alloying ultra-high-strength steel by constitutive equations and processing maps. J. Iron Steel Res. Int. 27, 807–819 (2020). https://doi.org/10.1007/s42243-019-00335-6

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  • DOI: https://doi.org/10.1007/s42243-019-00335-6

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