Coupled heat transfer and phase transformations of dual-phase steel in coil cooling

Dual-phase steels are generally used in the car industry due to high tensile strength and good formability, which obtained by a mixture of bainite ferrite phases. This microstructure is achieved through slow rate coil cooling. However, manufacturing dual-phase introduces various challenges such as instability cold rolling process. An important factor affecting this non-uniform cooling hot rolled strip. In rates not controlled there different thermal contacts during conveyance causing unequal steel coil. Unequal lead cooling, producing irregular phase transformations on sides coil, causes periodical variations fractions Varying cause thickness deviations strip A three-dimensional transient heat transfer finite element model was developed for modeling complete chain field an industrial scale. coupled transformation implemented subroutine into calculating resulting fractions. It found that produce uneven length- widthwise The validated comparing temperature profiles between simulated measured edges. fitted experimental data verification carried out conditions modeled test samples from cooled unwound