Warm Deformation Modeling And Research On Rolling Force Of C-Mn Steel

China is the largest steel producing country in the world, its productivity account forhalf of the world’s. However, under the glory of high productivity, high pollution, highenergy consumption, unreasonable product structure, low quality are hindering thedevelopment of Chinese iron and steel industry and leading to a slow growth, low profitcondition. Thus, searching for a low energy consumption, low cost production mode toenhance competitiveness is always a development direction. Warm rolling as one of the‘Energy Saving and Pollution Reduction’ production mode is always the focus in recentresearch. This paper mainly research45steel and65Mn, two typical C-Mn steel anddiscuss their deformation law in warm rolling, establish the math model of flow stress andalso research the rolling force in warm rolling, deduce the segmented rolling force modelbased on the flow stress distribution in deformed region.First of all, a simulation of the45steel and65Mn deformation process under differenttechnological parameter by GLEEBLE-3500is made, the feature of flow stress iscalculated and analyzed, combining with the metallographic structure scanning ofdeformed material, a conclusion that the C-Mn steel has different deformation stagebecause of the different microstructure evolution in warm rolling is drawn. The flow stressfeature, microstructure evolution and the influence of technological parameter arecombined to establish a C-Mn steel flow stress model in warm rolling.Next, the deformation law of deformation region in strip rolling is studied andcombined with the C-Mn steel flow stress model, then the rolling force model based onthe flow stress distribution in deformed region is established.At last, the rolling force of C-Mn steel warm rolling is calculated by programming inVB6.0and a FEM simulation of C-Mn steel warm deformation by ANSYS/LS-DYNA isdone. A contrast is made, which proves that a segmented rolling force model based on theflow stress distribution in deformed region is more precise than the one with a const flowstress in deformed region.