PARAMETRISATION OF A NUMERICAL MODEL FOR A PARTIAL HEATING STRATEGY USED TO EVALUATE A MASKING CONCEPT OF A HOT STAMPING PROCESS

1 BEHRENS Bernd-Arno
Co-authors:
1 CHUGREEV Alexander 1 JALANESH Masood 1 WÖLKI Kai 1 BOHNE Florian
Institution:
1 Leibniz Universität Hannover, Institute of Forming Technology and Machines, An der Universität 2, 30823 Germany, EU, bohne@ifum.uni-hannover.de
Conference:
28th International Conference on Metallurgy and Materials, Hotel Voronez I, Brno, Czech Republic, EU, May 22nd - 24th 2019
Proceedings:
Proceedings 28th International Conference on Metallurgy and Materials
Pages:
320-325
ISBN:
978-80-87294-92-5
ISSN:
2694-9296
Published:
4th November 2019
Proceedings of the conference were published in Web of Science and Scopus.
Metrics:
76 views / 61 downloads
Abstract

Hot stamping has become an established technology for the production of high strength steel parts in the automotive industry. The sheets are heated up to temperatures over austenitization temperature and held in order to obtain a fully austenised microstructure, formed and subsequently quenched. A locally optimized time-temperature-profile during heating provides the possibility to produce tailored parts, with locally varying microstructure and thus locally adapted mechanical properties. In order to determine an appropriate partial heating strategy, the heating as well as the cooling process has to be analyzed. In this paper a numerical model of a partial heating process is investigated in LS-DYNA comprising the heating process as well as the subsequent cooling phase. In order to describe the heating process, a new material model in LS-DYNA is used, which is suited for modeling arbitrary phase transformation processes of multiple phases with help of different transformation equations. The parameters of the numerical model are determined by means of experimental tests. The numerical findings are validated by comparison with experimental masking test.

Keywords: Hot Stamping, Partial Heating, FEM, Material Characterization, Austenitization
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