Hot stamped component of boron steel with tailored mechanical properties has multiphase microstructures. It is very important to establish a constitutive model related to multiphase microstructures for predicting the mechanical properties in the final component. Boron steel quenching experiments under different tool temperatures were performed with self-made experimental apparatus to achieve quenched specimens with different microconstituent volume fractions. Colour tint etching and image processing techniques were used to quantify the volume fractions of microconstituents. Tensile tests were also conducted to obtain stress–strain curves of the component with different volume fractions of microconstituents. The constitutive model of flow behaviour for quenched boron steel related to strain, strain rate and the volume fraction of quenched microconstituents was established by modified Field–Backofen.
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