Structural Turbulence of Plastic Flow and Ductile Fracture inLow-Alloy Steel under Lattice Curvature Conditions
2020
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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