Abstract
The development of modern computational methods and technologies makes it possible to perform high-precision calculations of complex processes, including metal forming processes. A relevant aspect is the use of approaches that describe with sufficient accuracy the structural transformations occurring in the metal. This is the basis for the use of modern numerical modeling methods and computer programs that allow one to calculate and predict the structural-phase composition of processed steels. The aim of this study is a comprehensive analysis of the deformation and thermal states of steel 09G2S in hot rolling temperatures of 1220°C, 1100°C and 8200C. The results of numerical modeling of the microstructure evolution of steel 09G2S based on the Johnson–Mehl–Avrami–Kolmogorov model dur-ing hot plastic deformation are presented. The average size of recrystallized grains and their volume fraction in the pro-cess of dynamic recrystallization were calculated. The possibility to use JMatPro software for modeling the evolution of microstructure is shown. The results of te thermokinetic calculation of steel 09G2S phase composition in an equilibrium state are presented, both thermokinetic and isothermal diagrams are constructed. The results obtained can be used to design technological processes for the manufacturing of products for different purposes, based on various types of thermal deformation ef-fects.
Keywords:
hot rolling, microstructure, modeling, JMatPro, Johnson–Mehl–Avrami-Kolmogorov model