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By A Erman Tekkaya; Nooman Ben Khalifa

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Additional info for Advances on hot extrusion and simulation of light alloys : selected, peer reviewed papers from the International Conference on Extrusion and Benchmark (ICEB), Dortmund 2009, Germany, September 16.-17. 2009

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Conclusion A method was presented to investigate dynamically recrystallized grains during hot forward extrusion. For this purpose a miniature press was designed. The design of the set up was explained in detail. One specimen was investigated in three directions; hence the shape and the size of the grains could be well analyzed. The method gives the possibility to work on the evolution of microstructure during hot forward extrusion. The experimental investigations and numerical calculations showed the potential to improve grain size calculation models which are available in literature and to predict the grain size.

A) (b) Fig. 6: (a) Subgrain size [m] as well as (b) grain size [m] evolution in the extrudate. The marked areas define the regions, which were compared with the experimental investigations. Hence the comparison of simulations and experiments show a good correspondence with regard to grain and grain and subgrain size (compare Fig. 5b and Fig. 6) of the air cooled condition. The water quenched specimen was not easy to characterize due to its fine substructure (Fig. 5a), however the difference between these two states has been numerically simulated and the expected tendency was verified.

288-292 [10] S. -Ing. Dissertation, Institut für bildsame Formgebung, Aachen, IBSN 3-8265-9718-4 (2001) [11] T. Kloppenborg, M. Schikorra, M. E. Sept. 2007, Zürich: Trans Tech Publications Ltd (2008), pp. 47-54. - ISBN 0-87849-467-7; [12] G. Petzow: Metallographisches, Keramographisches, Plastographisches Ätzen, 6. überarbeitete Auflage, Nachdruck, September 2006, Borntraeger, p. 72, IBSN 013000170; Key Engineering Materials Vol. 43 Modeling and Simulation of Microstructure Evolution in Extruded Aluminum Profiles F.

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