Media type: Text; E-Article Title: Enhancement of the interface of friction welded steel-aluminium joints Contributor: Behrens, Bernd-Arno [Author]; Duran, Deniz [Author]; Matthias, Tim [Author]; Ross, Ingo [Author] Published: Berlin : Springer, 2020 Published in: Production Engineering 15 (2021) ; Production Engineering Issue: published Version Language: English DOI: https://doi.org/10.15488/12698; https://doi.org/10.1007/s11740-020-00994-5 ISSN: 0944-6524 Keywords: Multi-Material Components ; Aluminum coated steel ; Friction Welding ; Joining ; Aluminium joints ; Extruded billets ; Impact Extrusion ; Extrusion ; Billets (metal bars) ; Induction heating ; Tailored Forming ; Aluminum ; Friction ; Extrusion tooling ; Counter pressure ; Joining interface ; Testing ; Transport industry ; Distribution functions ; Inductive heating ; Destructive testing Origination: Footnote: Diese Datenquelle enthält auch Bestandsnachweise, die nicht zu einem Volltext führen. Description: Lightweight multi-material components are of great importance for the transport industry. Not only the component’s weight can be decreased, but also its local properties can be adapted to different loading profiles. Tailored Forming is a novel concept for producing multi-material components. By using a joining process, the creation of a bond between different materials takes place in the first step of the process chain. In the subsequent steps, multi-material workpieces are processed in their joined state while maintaining or improving the joint strength. This study focuses on steel-aluminium joints, which were created by friction welding and further processed by induction heating and impact extrusion. A counter pressure superposition mechanism was implemented in the extrusion tooling to control the stress state during plastic deformation. Flow behaviours of steel and aluminium are largely different at a given temperature, which necessitates a near step-function temperature distribution in the hybrid billet to obtain matching flow stresses. An inductive heating strategy was developed which led to a temperature gradient in the billets before extrusion. Extruded billets were analysed by destructive testing methods and metallography. The bond could be maintained after extrusion when counter pressure superposition was used; but no improvement could be obtained. Without counter force superposition, however, cracks were observed in the joining interface and the joint strength decreased. This paper discusses the aforementioned findings in the current process design and makes suggestions on how the involved processes should be reconfigured to improve the joint strength. © 2020, The Author(s). Access State: Open Access Rights information: Attribution (CC BY)