Microstructure Simulation And Prediction Of Mechanical Properties In Thin Slab Continuous Casting And Continuous Rolling Process

Along with the rolling technology developing incessantly, the structure-property forecast has become the hot spot in the industrial production research. By using the structure-property forecast technology, may optimize the production craft, enhances the productivity, reduces the cost and improves the product quality. In this paper, considering the Compact Strip Production of thin Slab Continuous Casting and Continuous Rolling in Hunan HuaLin Iron and Steel Company, the microstructure simulation for the Q235B steel from the heating furnace exit to batching and the forecast system for the product's property during the thin Slab Continuous Casting and Continuous Rolling are established. Among the simulation in temperature field, it uses the PDE toolboxes of Matlab through inputting initial conditions in the borders to solve Partial Differential Equation of Heat transfer, calculate and display the temperature distribution situations of section of the plate. And based on this, the microstructure evolution behavior in the rolling process and the phase transformation law in the cooling process were analyzed. The appropriate recrystallization model and phase transformation model were chosen to calculate the austenite's crystal grain size and the residual strain after the last pass. Then the transformation score of the austenite to the ferrite and pearlite was calculated. And take this as the foundation, finally forecast the end product's mechanical property. In this paper all procedures were established using MATLAB. The contrast situation of the end product's mechanical property's measured value and simulated value indicated that, using the computer simulation procedure to forecast the mechanical property of the steel can obtain high precision, and may used in the further study of the on-line control.