Lehrstuhl für Fertigungstechnologie, Universität Erlangen-Nürnberg

Analysis and description of the mechanical material behavior of presshardenable boron-manganese steels



Datum: 18.12.2012


Author


Reporter

  • Prof. Dr.-Ing. habil. M. Merklein
  • Prof. Dr.-Ing. R. Kolleck

In the scope of this work was the improvement of the accuracy of FE models with regard to forming process following the temperature-time profile of the hot stamping process. Caused by a temperature gradient in the sheet metal during the forming step because of varying cooling behavior, different forming velocities can be observed. Hence very high strain rates are present in the free forming zone due to the appearance of the highest temperature. In the focus of the investigations the forming behavior of boron manganese steels had been determined and described in dependency of process relevant influencing factors. Furthermore a methodology for the determination of true stress-strain curves at elevated temperatures in the layer compression test had been determined, enabling the rating of the stress state on the forming behavior of boron manganese steels.

The distinctive improvement of the quality of the FE modeling of hot stamping processes utilizing the knowledge of this work had been shown in a comparison of the sheet thickness evolution of a numerically mapped and a experimentally formed component.