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Effect of submicrocrystalline state on strength and impact toughness of low-carbon 12GBA steel

  • Strength and Plasticity
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Abstract

The effect of intense warm deformation on the structure and mechanical properties of low-carbon 12GBA steel was investigated. A submicrocrystalline (SMC) structure with an average element size of 0.3 μm was formed in the steel by isothermal overall forging. The formation of the SMC structure resulted in a sharp increase in strength by a factor of two to three in relation to the initial coarse-grained state while retaining a sufficient level of plasticity and impact toughness. After further annealing, steels exhibit an improved set of properties; i.e., as the strength decreases slightly, the plasticity increases sharply. Impact tests at low temperatures have shown the significant advantage of the SMC state of the steel over the coarse-grained state in the impact toughness. It is established that the cold resistance in the SMC state increases because the crack propagation prevails in the overall sample fracture.

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Authors and Affiliations

  1. Institute of Problems of Metal Superplasticity, Russian Academy of Science, ul. Khalturina 39, Ufa, 450001, Bashkortostan, Russia

    I. M. Safarov, A. V. Korznikov & S. N. Sergeev

  2. Institute of Engineering Science, Ural Branch, Russian Academy of Sciences, ul. Komsomol’skaya 34, Ekaterinburg, 620219, Russia

    S. V. Gladkovskii & E. M. Borodin

Authors
  1. I. M. Safarov
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  2. A. V. Korznikov
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  3. S. N. Sergeev
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  4. S. V. Gladkovskii
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  5. E. M. Borodin
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Corresponding author

Correspondence to I. M. Safarov.

Additional information

Original Russian Text © I.M. Safarov, A.V. Korznikov, S.N. Sergeev, S.V. Gladkovskii, E.M. Borodin, 2012, published in Fizika Metallov i Metallovedenie, 2012, Vol. 113, No. 10, pp. 1055–1060.

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Safarov, I.M., Korznikov, A.V., Sergeev, S.N. et al. Effect of submicrocrystalline state on strength and impact toughness of low-carbon 12GBA steel. Phys. Metals Metallogr. 113, 1001–1006 (2012). https://doi.org/10.1134/S0031918X12100109

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  • DOI: https://doi.org/10.1134/S0031918X12100109

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