Numerical Simulation of Phase Transformation during the Hot Stamping Process
A technology to manufacture highest-strength automotive components is hot stamping. This process combines forming and heat treatment of sheet metal material. During and after the hot stamping process phase transformations from austenite to other phases occur. For a realistic prediction of the resulting component properties by means of numerical simulation it is essential to consider these complex effects of phase transformation and their respective characteristics, such as flow properties.
In respect of the numerical investigations, several aspects of a developed material model are presented, that considers inter alia the transformation-induced stresses. The methods to determine the necessary material parameters with the help of a quench and deformation dilatometer are also presented. The model is tested by comparison of experiment and simulation with respect to phase fractions, geometrical distortions and sheet thickness distribution.