Hot stamping forming and finite element simulation of USIBOR1500 high-strength steel

Flow stress curves of USIBOR1500 high-strength steel at high temperatures were obtained by tensile test. A constitutive model of high-temperature deformation of the material was established at 300–600 °C and 500–800 °C for one- and two-stage hot-forming processes, respectively. On the basis of the established constitutive equation, the one- and two-stage hot-forming methods were simulated, and the best process was determined. Results showed that the parts with simple shape and structure adopted the one-stage hot stamping technology, whereas the complicated parts adopted the two-stage hot stamping technology. The process parameters of the one-stage hot stamping technology are as follows: heating of the sheet material to more than 850 °C through an electric furnace, initial die temperature of 100 °C, stamping speed of 50 mm/s, pressing force of 1.28 kN, and punching pressure of 19.8 kN.