Bonding Experiments at Elevated Temperatures: The Effect of the Sample Storage Time on the Bond Strength of Metals

steel research international, vol. 94

Abstract

Bond formation plays a major role in the production of metallic composites, e.g., in roll bonding, composite ring rolling, and the permanent closure of voids by metal forming at elevated temperatures. At the same time, the determination of the corresponding bonding strength is quite challenging due to various influencing factors. These factors include the impact of the surface roughness and the degree of oxidation. The transition, or rather the storage time between the surface pretreatments and testing, leads to deviations in the surface conditions between the experiment and the industrial process. To evaluate the effect of the sample storage time on the bond strength of aluminum and steel, bonding experiments are conducted with storage times ranging from several minutes to 9 weeks at room temperature. The results show a major reduction of the bond strength between different aluminum alloys with increasing storage time, while the steel bond strength is less affected. The reasons for this are differences in the oxidation behavior of aluminum, tempered steel, and stainless steel. Nevertheless, the results indicate the importance of the storage time at room temperature and bonding parameters at elevated temperatures on the bond strength between these metals.

Authors 6

1. Jürgen A. Nietsch Aachen Institute of Metal Forming

   RWTH Aachen University

   Affiliation as printed

   Institute of Metal Forming (IBF) RWTH Aachen University Intzestraße 10 52072 Aachen Germany

2. Moritz Gouverneur corresponding Aachen Institute of Metal Forming

   RWTH Aachen University

   Affiliation as printed

   Institute of Metal Forming (IBF) RWTH Aachen University Intzestraße 10 52072 Aachen Germany

3. Christian Günter Georg Schwab Aachen Institute of Physical Chemistry

   RWTH Aachen University

   Affiliation as printed

   Institute of Physical Chemistry (IPC) RWTH Aachen University Landoltweg 2 52074 Aachen Germany

   Institute of Physical Chemistry (IPC), RWTH Aachen University, Landoltweg 2, 52074 Aachen, Germany

4. David Benjamin Bailly Aachen Institute of Metal Forming

   RWTH Aachen University

   Affiliation as printed

   Institute of Metal Forming (IBF) RWTH Aachen University Intzestraße 10 52072 Aachen Germany

5. Manfred Martin Aachen Institute of Physical Chemistry

   RWTH Aachen University

   Affiliation as printed

   Institute of Physical Chemistry (IPC) RWTH Aachen University Landoltweg 2 52074 Aachen Germany

   Institute of Physical Chemistry (IPC), RWTH Aachen University, Landoltweg 2, 52074 Aachen, Germany

6. Gerhard Hirt Aachen Institute of Metal Forming

   RWTH Aachen University

   Affiliation as printed

   Institute of Metal Forming (IBF) RWTH Aachen University Intzestraße 10 52072 Aachen Germany