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Questioning the Effect of Bainite Morphology on the Impact Viscosity of Low-Carbon Steels

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Abstract

In this paper, we study the morphology of the bainite component of the microstructure of rolled products and the mimic coarse-grained region of the thermal effect zone of K60–K65, 09G2S, and 08KhN2MFB low-carbon steels by methods of optical microscopy and electron backscatter diffraction. In the homogeneous microstructure of the former austenite—both in the coarse-grained heat-affected region and in rolled products—the density of high-angle grain boundaries is shown to be higher in lath bainite than that in granular bainite. In the case of a substantially inhomogeneous microstructure of the former austenite, the size effect of the initial grain structure on the effective grain size (high-angle boundaries) prevails over the change in the bainite morphology. The lower-temperature component, lath bainite, turns out to be coarser-grained (in the case of its formation from large-sized austenite grains) than granular bainite. The impact viscosity and cold resistance of a metal, the microstructure basis of which is a mixture of granular and lath bainite, increased at an increase in the density of high-angle boundaries, which in turn is determined by both the grain size of the initial austenite and the morphology of bainite.

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Funding

The work on study of the microstructure of high-strength steels by electron backscatter diffraction was supported by the Ministry of Science and Higher Education of the Russian Federation, state assignment no. 075-00328-21-00.

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Authors and Affiliations

  1. Engineering and Technology Center, JSC Vyksa Metallurgical Plant, 607061, Vyksa, Russia

    L. I. Efron, P. P. Stepanov & K. S. Smetanin

  2. Baikov Institute of Metallurgy and Materials Science, Russian Academy of Sciences, 119334, Moscow, Russia

    K. G. Vorkachev, M. M. Kantor & V. A. Bozhenov

Authors
  1. L. I. Efron
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  2. P. P. Stepanov
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  3. K. G. Vorkachev
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  4. M. M. Kantor
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  5. V. A. Bozhenov
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  6. K. S. Smetanin
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Correspondence to L. I. Efron.

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Translated by A. Ivanov

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Efron, L.I., Stepanov, P.P., Vorkachev, K.G. et al. Questioning the Effect of Bainite Morphology on the Impact Viscosity of Low-Carbon Steels. Steel Transl. 51, 670–676 (2021). https://doi.org/10.3103/S0967091221090035

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  • DOI: https://doi.org/10.3103/S0967091221090035

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