FEM Simulation Of Second Hot Rolling Considering Microstructure Evolution During First Pass And Time Interval

With the development of computer science and technology, the traditional method of rolling technology has been greatly changed. The use of computer simulation method instead of physical simulation of rolling process can not only save costs of experiment, but also make a deep study which is not suitable for experiment possible, such as the simulations of stress- strain distribution, temperature distribution, shape forming and organization and performance forecasting.In recent years, with the continuous development and improvement of the finite element computer software and hardware technology, finite element numerical simulation technique has been widely applied to rolling simulation. The establishment and improvement of mathematical model in the rolling process and solution precision of variable distribution has become development requirements in the rolling simulation.In this paper, based on double-pass hot simulation data, the hot flow stress curves of dynamic recovery in the 09CuPTiRE steel's first and second pass was regressed, taking microstructure evolution occurred in the first hot working and time interval into account. Corresponding to two kind material properties, three-dimensional elastic-plastic finite element simulation had been carried out separately with explicit power analysis software-LS_DYNA and stress-strain distributions of second hot rolling had been got. According to the analysis of simulation results, effects of microstructure evolution during first pass and interval time on second hot- rolling has been discussed. Meanwhile, accuracy of flow Stress model in the second hot rolling simulation has been discussed.This paper shows:1. Flow curve of second hot rolling, based on double-pass hot simulation test data, can correctly reflect microstructure evolution during the first hot-rolling and time interval. 2. Finite element simulation results of second hot rolling, taking microstructure evolution during the first hot-rolling and time interval into account, are in good agreement with experimental results.3. Dynamic recrystallization behavior during the first hot working can significantly eliminate work-hardening and the stress of second hot rolling is lower.4. Usually, interval time has small impact on the second hot rolling.