Research on analytical model of blank temperature prediction for hot stamping of ultra high strength steels

In the hot stamping and quenching process of ultra high strength steels,the formability and the final mechanical property of the steels are directly influenced by the heat transfer condition between the blank and the die.The heat transfer of the blank in the hot stamping and quenching process was analyzed by analytical method.According to the heat transfer behavior of the steels,the whole heat transfer process was divided into three phases:transfer to air,transfer to die and the mix of air and die.The analytical model was proposed to describe the relationship between the temperature change and time in different phases and verified by experimental investigation.Results show that there is acceptable agreement between the analytical model and the experimental results,and the temperature of steel blank calculated by the proposed model can reflect the law of the steels temperature change during hot stamping process.The proposed model will provide necessary and reliable basis for the further investigation and application of the hot stamping and quenching process.