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Cold rolling of coated steel sheets as pretreatment for hybrid components

Donnerstag (19.04.2018)
10:20 - 10:40 Uhr

10:20 - 10:40 Uhr

Nowadays the requirements regarding material properties are quite ambitious. It is therefore difficult to find a single material to fulfil the demands. Hybrid components of different materials are used to meet these demands by a combination of beneficial material properties, such as chemical resistance, high strength and lightweight. The challenge is to achieve a resilient compound between different materials. In general, it can be distinguished between interlocking and metallurgical bonding. This paper deals with a possible process chain to prepare steel sheets for an application as hybrid components consisting of steel, a link layer and high-pressure die cast aluminium. A steel sheet is coated with a bonding layer using cold gas spraying (CGS). This layer enables a metallurgical bonding between the steel sheet and the molten aluminium. In the next process-step a channel-like structure is rolled into the surface of the coated steel sheet to allow a form closure connection in addition to the metallurgical bonding. The application and structuring of different coatings is examined in this paper. Therefore, aluminium and copper based coatings are applied by CGS. In a subsequent process step the compound is structured in an adapted rolling process. Properties of this compound, such as adhesion strength and bonding quality, are analysed throughout both process steps. It can be stated that heat treated copper layers can be structured without a reduction of adhesion strength and delamination. Similar results can be shown for layers made of AA7075.

Stefan Senge
RWTH Aachen University
Weitere Autoren/Referenten:
  • Leonid Gerdt
    RWTH Aachen University, Institut für Oberflächentechnik
  • Stefanie Wiesner
    RWTH Aachen University, Institut für Oberflächentechnik
  • Dr. Mehmet Öte
    RWTH Aachen University, Institut für Oberflächentechnik
  • Prof. Dr. Kirsten Bobzin
    RWTH Aachen University, Institut für Oberflächentechnik
  • Prof. Dr. Gerhard Hirt
    RWTH Aachen University, Institut für Bildsame Formgebung