Parametrisation of a numerical model for a partial heating strategy used to evaluate a masking concept of a hot stamping process

authored by: Bernd-Arno Behrens, Alexander Chugreev, Masood Jalanesh, Kai Wölki, Florian Bohne
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.
Organisation(s): Institute of Metal Forming and Metal Forming Machines
Type: Conference contribution
Pages: 320-325
No. of pages: 6
Publication date: 04.11.2019
Publication status: Published
Peer reviewed: Yes
ASJC Scopus subject areas: Surfaces, Coatings and Films, Mechanics of Materials, Metals and Alloys
Electronic version(s): https://doi.org/10.37904/metal.2019.684 (Access: Open)
: Details in the research portal "Research@Leibniz University"

BibTeX

@inproceedings{ddea738c8b3f40979be9228df81ef836,
title = "Parametrisation of a numerical model for a partial heating strategy used to evaluate a masking concept of a hot stamping process",
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 = "Austenitization, FEM, Hot Stamping, Material Characterization, Partial Heating",
author = "Bernd-Arno Behrens and Alexander Chugreev and Masood Jalanesh and Kai W{\"o}lki and Florian Bohne",
note = "Funding information: The presented work is a result of the project: „Partielles Formh{\"a}rten durch Einsatz einer Maskierung im Ofenprozess“ funded by the Deutsche Forschungsgemeinschaft - 310404283. The authors gratefully thank for the funding.; 28th International Conference on Metallurgy and Materials, METAL 2019 ; Conference date: 22-05-2019 Through 24-05-2019",
year = "2019",
month = nov,
day = "4",
doi = "10.37904/metal.2019.684",
language = "English",
series = "Metal Conference Proceedings",
publisher = "TANGER Ltd.",
pages = "320--325",
booktitle = "Proceedings 28th International Conference on Metallurgy and Materials",
}