ANALYSIS OF REGRESSION MODELS OF STRENGTH AND PLASTIC PROPERTIES OF DEFORMATION-THERMALLY HARDENED REINFORCING PROFILE

Abstract

Numerous studies have shown that the processes of structure formation as aresult of the combined effect of plastic deformation and phase transformations onthe alloy are different from the formation of the structure during conventional heattreatment and provide a high set of mechanical properties that cannot be achievedby conventional methods of heat treatment or complex alloying.Сurrently, in the production of rod reinforcement for reinforced concretestructures, technologies of combined deformation and thermal hardening areincreasingly used. When hot rolling is combined with subsequent heat treatment,intensive and controlled cooling of hotly deformed austenite is performed directlyat the exit from the finishing stand of the rolling mill, which leads to a stronggrinding of the structure, and, consequently, provides high mechanical propertiesof the material than when cooling in air, as was the case at many existing rollingmills.Analytical review of the literature on the problem of combining hotdeformation with heat treatment shows that the efficiency of deformation and heattreatment depends on the temperature of rolling, the total degree of fragmentationand deformation, the degree of a single strain, time interval from the end of hotrolling to the beginning of accelerated cooling, duration of intensive coolingdefines the temperature smoothback, like the original steel (cast or rolled), andfinally, the chemical composition of the processed steel [1].