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Constitutive Modeling of Hot Deformation Behavior of High-Strength Armor Steel

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Abstract

The hot isothermal compression tests of high-strength armor steel under a wide range of deformation temperatures (1100-1250 °C) and strain rates of (0.001-1/s) were performed. Based on the experimental data, constitutive models were established using the original Johnson-Cook (JC) model, modified JC model, and strain-compensated Arrhenius model, respectively. The modified JC model considers the coupled effects of strain hardening, strain rate hardening, and thermal softening. Moreover, the prediction accuracy of these developed models was determined by estimating the correlation coefficient (R) and average absolute relative error (AARE). The results demonstrate that the flow behavior of high-strength armor steel is considerably influenced by the strain rate and temperature. The original JC model is inadequate to provide good description on the flow stress at evaluated temperatures. The modified JC model and strain-compensated Arrhenius model significantly enhance the predictability. It is also observed from the microstructure study that at low strain rates (0.001-0.01/s) and high temperatures (1200-1250 °C), a typical dynamic recrystallization (DRX) occurs.

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Acknowledgments

The authors would like to thank Director, DMRL for his support and encouragement throughout this work.

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Authors and Affiliations

  1. Defence Metallurgical Research Laboratory, Hyderabad, 500058, India

    Ravindranadh Bobbili & Vemuri Madhu

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  1. Ravindranadh Bobbili
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  2. Vemuri Madhu
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Correspondence to Ravindranadh Bobbili.

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Bobbili, R., Madhu, V. Constitutive Modeling of Hot Deformation Behavior of High-Strength Armor Steel. J. of Materi Eng and Perform 25, 1829–1838 (2016). https://doi.org/10.1007/s11665-016-2001-z

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  • DOI: https://doi.org/10.1007/s11665-016-2001-z

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