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Peak temperature
Modelling of the peak temperature depended internal stress formation of transforming steels during thermal forming (Vo 530/37-1)
During thermal forming the residual stresses and the changing material strength influence the forming-, buckling- and fatigue behaviour of components. The internal stresses and the material strength are dependent on the transforming velocity of the microstructure, which are displayed through continuous time-temperature-transforming-charts. These charts describe the transforming behaviour according to a single austenizing peak temperature. In simulations the local variation of the peak temperature on the heat-effected zone was neglected until now. A global peak temperature for the description of the transforming relation is assumed. Due to the non-linear dependences of the component-characteristics and the time dependences of the temperature-field the influence of this simplified assumption on the residual stresses is very complex. Therefore, the aim of the research project is the characterisation of this influence and to create methods, which affords an implementation of local diversified transforming speed for the calculation of the internal stress in a finite element simulation.
Funded by
DFG
Timeframe
2009/09/01 - 2010/08/31
Department Manager
Dipl.-Phys. Haiko von Rebenstock
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