Innovative joining technology for multi-material applications with high manganese steels in lightweight car body structures
- 102 Downloads
Due to restrictions imposed by legal requirements, automotive manufacturers are forced to reduce the pollutants emission of new models. A promising approach is the reduction of the vehicle weight, whereby the body in white offers great potential. This weight reduction is realized by new car body constructions, which contain the increasing usage of different materials. Furthermore, new lightweight materials like TWIP steels become more important. The successful and economic implementation of multi-material design with TWIP steels requires the availability of suitable joining technologies. Conventional thermal joining technologies can be used in consideration of specific characteristics related to welding austenitic steels. Within the project, challenging material combinations related to dissimilar materials are investigated. In this paper, high-speed joining is investigated as an innovative and promising joining technology for multi-material applications. This mechanical joining technology contains an auxiliary joining part, called tack, which is driven with high speed into the joining partners. The challenges as well as the optimization of the auxiliary joining part is shown. The investigations are attended by metallographic analysis, whereby mechanical properties are determined through destructive tests. The characteristics are compared to the results of current used standard tacks.
KeywordsMulti-material design High manganese steel High-speed joining
The research leading to these results has received funding by the European Union’s Research Fund for Coal and Steel (RFCS) research program under grant agreement no. RFSR-CT-2015-00016.
- 2.Frommeyer G. Gräßel O (1998) High strength TRIP/TWIP and superplastic steels: development, properties, Application In: La Revue de Metallurgie; Vol. 95, No. 10, , pp.1299–1310Google Scholar
- 3.Flüggen F (2014) Qualifizierung des Bolzensetzens als Verfahren zum Fügen höchstfester Stahlwerkstoffe. Dissertation, University of Paderborn. Shaker Verlag, AachenGoogle Scholar
- 4.N.N. (2011) Technical datasheet C60. Salzgitter Flachstahl GmbH: SalzgitterGoogle Scholar
- 5.DIN 17021 (1976) Part 1.: heat treatment of iron and steel; material selection; steel selection according to hardenability. Beuth-Verlag, BerlinGoogle Scholar
- 6.Läpple V(2014) Wärmebehandlung des Stahls: Grundlagen, Verfahren und Werkstoffe; [neue europäische und internationale Normen ; mit Aufgabensammlung]. 11. Auf. Haan-Gruiten: Verlag Europa-Lehrmittel Nourney, VollmerGoogle Scholar
- 7.Bergmann W (2013) Werkstofftechnik 1 : Struktureller Aufbau von Werkstoffen - Metallische Werkstoffe - Polymerwerkstoffe - Nichtmetallisch-anorganische Werkstoffe. M: Carl Hanser Verlag GmbH & Co. KGGoogle Scholar
- 8.Totten GE2013 Steel heat treatment handbook – metallurgy and technologies – second edition. PortlandGoogle Scholar
- 9.N.N.(2013) Technical card C60. Lucefin group:Google Scholar
- 10.Moyer JM Ansell GS (1975) The volume expansion accompanying the martensite transformation in iron- carbon alloys. In: Metallurgical Transactions A Vol 6A, , pp. 1785–1791Google Scholar
- 11.G. Krauss: Steels, processing, structure and performance, (ASM Int’l, 2005, Materials Park, OH 44073-0002)Google Scholar
- 12.Thelning K-E (1978) Steel and its heat treatment. Butterworth-Heinemann, OxfordGoogle Scholar