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Hardening Mechanism in Low-Carbon Low-Alloy Steels with a Simultaneous Increase in Ductility and Fracture Toughness

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Abstract

The paper analyzes the nucleation and growth of bainite in low-carbon low-alloy 09Mn2Si steel doped with titanium carbonitride nanoparticles in impact toughness testing. The analysis shows that such particles segregate at low-angle boundaries, retarding the formation of high-angle ones, and when impacted into the steel, they curve the lattice and generate a new bainite phase at the curvature interstices. The mechanism of bainite nucleation and growth is sympathetic, obeys the angular momentum conservation law, and provides the formation of multilayered packets of bainite plates capable for unlimited thinning to sub-sub-subunits during deformation. Such bainite plates can respond to their stress-strain state by one or another rotation, showing a high relaxation capacity and providing a high impact toughness of the steel at low temperatures.

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Funding

The work was performed under Fundamental Research Program of the State Academies of Sciences for 2013–2020 (project III.23.1.1 project), RFBR project No. 17-01-00691, and SB RAS integration project No. II.1.

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Authors and Affiliations

  1. Institute of Strength Physics and Materials Science, Siberian Branch, Russian Academy of Sciences, 634055, Tomsk, Russia

    P. V. Kuznetsov, V. E. Panin & N. K. Galchenko

  2. National Research Tomsk Polytechnic University, 634050, Tomsk, Russia

    P. V. Kuznetsov & V. E. Panin

  3. National Research Tomsk State University, 634050, Tomsk, Russia

    V. E. Panin

Authors
  1. P. V. Kuznetsov
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  2. V. E. Panin
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  3. N. K. Galchenko
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Corresponding author

Correspondence to P. V. Kuznetsov.

Additional information

Russian Text © The Author(s), 2019, published in Fizicheskaya Mezomekhanika, 2019, Vol. 22, No. 5, pp. 19–27.

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Kuznetsov, P.V., Panin, V.E. & Galchenko, N.K. Hardening Mechanism in Low-Carbon Low-Alloy Steels with a Simultaneous Increase in Ductility and Fracture Toughness. Phys Mesomech 23, 347–353 (2020). https://doi.org/10.1134/S1029959920040098

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  • DOI: https://doi.org/10.1134/S1029959920040098

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