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Title of Journal: Int J Mater Form

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Abbravation: International Journal of Material Forming

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Springer Paris

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DOI

10.1007/bf00114528

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1960-6214

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Formability analysis of thin press hardening steel

Authors: G Georgiadis A E Tekkaya P Weigert S Horneber P Aliaga Kuhnle
Publish Date: 2016/03/03
Volume: 10, Issue: 3, Pages: 405-419
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Abstract

Aiming at the enhancement of the lightweight potential of press hardening steels investigations on the formability of thin boron alloyed hot dip aluminized steel sheets are carried out The material formability is described through Forming Limit Diagram FLD determined by means of Nakajima formability test of thin 22MnB5 sheets 050 mm 080 mm 125 mm at elevated temperatures The influence of sheet thickness on forming limits is evaluated under both isothermal and nonisothermal conditions The effect of different deformation start temperatures is examined The nonisothermal behavior is further investigated via microstructural analysis and a study on temperature profile during Nakajima test The results show a significant difference regarding the influence of sheet thickness under isothermal and nonisothermal conditions Increasing the sheet thickness results as expected in higher forming limits for isothermal conditions whereas for nonisothermal conditions the opposite effect on formability is observed The obtained Forming Limit Curves FLCs are validated through hot stamping simulation and subsequent analysis of different thin components concluding that in case of thin sheets the isothermal FLC constitutes a more conservative approach while the nonisothermal one reaches the formability limits with higher accuracyThe authors would like to sincerely thank Dr M Alsmann from Volkswagen Kassel for his support and the invaluable discussions within the scope of the current work Thanks are due to S Samadi from Volkswagen Wolfsburg for his support during the metallographic analysis

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