Non-isothermal deformation behavior and FE simulation of ultrahigh strength BR1500HS steel in hot stamping process

In the current work, the effects of initial deformation temperature and strain rate on flow behavior and microstructure of boron-alloyed steel after non-isothermal deformation were investigated. Based on the stress-strain curve obtained in the non-isothermal tensile experiment with a Gleeble 3500 system, finite element software was used to carry out the thermal mechanical coupled simulation of hot stamping process, which was further validated by hot stamping experiment of a V-channel part. The results indicate that the forming force was higher than that of the isothermal deformation. It was also observed that the initial stamping temperature should be above 750 A degrees C, and the holding and quenching time should be up to 15 s in hot stamping process according to finite element (FE) simulation. Finally, the results obtained from hot stamping experiments are in good consistency with the simulation; thus, it reveals that the FE modeling of non-isothermal hot stamping process is reliable.