Computer simulation of flat bars rolling

Abstract

Two different types of flat bars (P 100x40 and P 80x5) have been selected for the computer simulation. It has been performed with the FormFEM programme and then with the ITA company-produced TT-steel software package. The bars were continuously rolled in two-high mills, which typically had the H-V arrangement. The bars were rolled of common structural steel stock. Mathematical computation of kinetics of static and dynamic recrystallization have been conducted independently of the computer simulation. Furthermore, calculation of grain size was performed. The heat transfer was studied theoretically. Results of the study have been compared with renowned laboratory experiments and the heat transfer curve was selected according to contact time, temperature and flow stress of the material. This software package has been used for simulation of heat temperature upon rolling with support of the TTSteel programme. The results comprised volume fractions of ferrite, austenite, pearlite, bainite and martensite in the microstructure and mechanical properties (yield strength, ultimate strength and hardness) upon heat treatment. The resulting values indicate that homogeneous structure is formed.