The structural and phase transformations and the strengthening of nitrogen-containing
steels resulting from alloying and thermomechanical treatment have been investigated using X-ray
diffraction analysis, optical microscopy, hardness measurements and tensile testing. For the
modeling of thermomechanical treatment processes, a DIL 805A/D dilatometer with a deformation
capability and a Gleeble 3800 simulator were used. Rational nitrogen or nitrogen plus carbon
concentrations are determined by basic composition of an alloy. They are limited by the processes
of precipitation of excess phases during crystallization and their dissolution during heating stage of
the thermal or thermomechanical treatment. Combined alloying by carbon and nitrogen leads to
significant complication of phase and structural transformations in steels, including hot deformation
that manifests itself in changes of strain-stress diagram parameters. Effectiveness of increasing of a
hot deformation resistance under alloying by nitrogen and carbon depends on a basic composition
of steel, C/N ratio and temperature-strain rate deformation conditions.
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