MODELING OF MICROSTRUCTURE EVOLUTION OF CARBON STEEL BARS DURING DEFORMATION BY A NEW COMBINED METHOD

In this work, the influence of combined radial-shift broaching and subsequent drawing technology on the evolution of bar microstructure by the Johnson–Mehl–Avrami–Kolmogorov (JMAK) method was investigated. From the obtained data of microstructure modeling, we can say that deformation of the billet according to the scheme 30–25–20 at room temperature is the most effective way, because it allows to crush the initial grain more than 3 times on the surface of the billet. At the same time, the use of the scheme 30–27–23 at room temperature gives a twofold pulverization of the initial grain. Processing of the central region of the workpiece in all considered models has a weakly pronounced character, reaching 35% reduction in the most optimal conditions.