QUANTITATIVE ANALYSIS OF SIZE OF LOCALIZATION ZONE OF PLASTIC DEFORMATION BEFORE FRONT OF GROWING CRACKS WITH THE ACCOUNT OF STRUCTURAL STATE OF MATERIAL Part 2

Annotation. Goal. Analysis of models for the quantitative estimation of the size of the zone of localization of plastic deformation before the front of a growing crack with allowance for the structural state. Methodology. Theoretical calculations in accordance with existing models and quantitative analysis of the experimental data. Results. For low-alloyed microalloyed steel 10G2FB, models for calculating the size of the localization of plastic deformation before the front of a growing crack with allowance for the structural state are analyzed. Scientific novelty. Based on the existing models, a quantitative analysis of the size of the zone of localization of plastic deformation before the front of a growing crack in low-carbon microalloyed steels with a ferrite-perlite structure was carried out. It has been found necessary to take into account the structural state of the material, namely the presence of defects and their influence on the formation of the zone of localization of plastic deformation. Practical significance. Development of ways to stabilize mechanical properties, in particular impact toughness, of thick-rolled steel from low-carbon microalloyed steels of domestic production on the basis of establishing the relationship between structural parameters and fracture surfaces.