|About this Abstract
||NUMISHEET 2022: The 12th International Conference on Numerical Simulation of 3D Sheet Metal Forming Processes
||On the Constitutive and Fracture Response of Tailor Hot-Stamped DuctiborŽ 1000-AS Steel:
Experimental Characterization and Modelling
||Pedram Samadian, Armin Abedini, Cliff Butcher, Michael Worswick
|On-Site Speaker (Planned)
DuctiborŽ 1000-AS is used in press-hardening tailor-welded blanks (TWBs) to provide regions with higher ductility and energy absorption following hot stamping in final products. This study investigates the constitutive and fracture behavior of this steel in different hot-stamped conditions. Three distinct material conditions were achieved using die temperatures of 25 °C, 350 °C, and 450 °C during the hot-stamping process. Microstructure and hardness investigations were conducted on the as-quenched blanks. The constitutive response was characterized via tensile and shear testing. The fracture behavior was examined by means of shear, hole-expansion, plane-strain tension notch, and equibiaxial tension Nakazima dome  tests. The material hardening and fracture were modelled based on a hybrid micromechanical and phenomenological technique developed by Samadian et al. . The hardening behavior was calculated using a mean-field homogenization scheme based on the micro-constituent flow behavior acquired by a dislocation-based hardening law. The fracture response was computed by the calculation of per-phase damage accumulation using a phenomenological damage indicator. The results revealed that the 25 °C die-quenched condition with a fully-martensitic microstructure has the highest strength and lowest ductility, whereas the 350 °C and 450 °C die-quenched conditions with lower martensite contents have lower strength and higher ductility under all of the loading conditions, respectively. The predicted flow curves and fracture limits for all material conditions were in good accord with the measured data and experimentally-based Mohr-Coulomb (MMC) fracture loci . The constitutive and fracture response in DuctiborŽ 1000-AS for a range of multi-phase microstructures were successfully predicted using the established hardening-damage predictive technique.
||Definite: At-meeting proceedings