SUNConferences, COMA '13

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Simulating an Innovative Austenitization Process Developed for Hot Stamping
Reimund Neugebauer, Roland Müller, Stefan Meinel, Alwyn Bester

Last modified: 2013-08-20

Abstract


There is a constant drive to improve automobiles by enhancing safety, reducing weight and containing cost. This combined with a new focus to improve resource efficiency during manufacturing, forces role players to rethink and improve current processes and develop novel manufacturing techniques. One such a novel resource saving technique, currently being researched at the Chemnitz University of Technology and Fraunhofer IWU, combines a modified batch galvanizing process with a direct hot stamping process. In doing so it eliminates the traditionally required surface coating process with its energy requirements. In this study the process uses molten Zn alloy at 850 °C to simultaneously heat and apply a corrosion protective coating to 22MnB5 for subsequent use in hot stamping. A CFX simulation was conducted in order to understand the thermal behaviour of the bath containing the alloy and the treated steel during the dipping process. The material properties, of 22MnB5 and the stainless steel used to construct the bath, essential to the simulation (heat capacity, density and thermal diffusivity) was measured over the relevant temperature range for the heating cycle using a pushrod dilatometer, differential scanning calorimeter and a laser flash apparatus. The simulation was evaluated using experimental data, showing a good correlation between the simulation and experimental results.

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