An optimization-based numerical procedure was developed to determine the tool temperature-dependent heat-transfer coefficient (HTC) between the blank and tools during the hot stamping of boron steel. During the quenching period, HTC decreased with the increasing tool temperature. There was no obvious linear relationship between the two. The HTCs were 2493 and 856 W m À2 K À1 , respectively, under the tool temperatures of 373 K and 723 K (100°C and 450°C).
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.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.