Abstract
The possibility of the structural turbulence of plastic flow and ductile fracture in low-carbon and low-alloy steel 09Mn2Si is shown by fracture toughness measurements and uniaxial tension of chevron-notched specimens at 20°C. The conditions for the structural turbulence of plastic deformation of solids are determined which provide high fracture toughness. The decisive functional role is played by the lattice curvature, the appearance of mesoscopic structural states in the lattice interstices at the nanoscale, the activation of self-consistent rotational motion in the hierarchy of mesoscopic structural levels, the presence of free volume, and the possibility of structural transformations at the nanoscale. A nonlinear theory of describing structural turbulence in a deformable solid is discussed.
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Funding
This work was carried out as part of the Government Statement of Work within the Program of Fundamental Research of the State Academies of Sciences for 2013–2020 (project III.23.1.1), RFBR project No. 17-01-00691, and Integration Project of the SB RAS No. II.1.
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Russian Text © The Author(s), 2019, published in Fizicheskaya Mezomekhanika, 2019, Vol. 22, No. 4, pp. 16–28.
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Panin, V.E., Egorushkin, V.E., Kuznetsov, P.V. et al. Structural Turbulence of Plastic Flow and Ductile Fracture in Low-Alloy Steel under Lattice Curvature Conditions. Phys Mesomech 23, 279–290 (2020). https://doi.org/10.1134/S1029959920040013
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DOI: https://doi.org/10.1134/S1029959920040013