Localized in situ heat treatment of cold sprayed Al6061 deposits

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M. Sc. Jim Klutta, jim.klutta@hsu.hamburg, HSU/Institut für Werkstofftechnik/Institute for materials science; M. Sc. Luca Klinger, luca.klingler@hsu-hh.de, HSU/Institut für Werkstofftechnik/Institute for materials science; Dr.- Ing. Alwxander List, alexander.list@hsu-hh.de, HSU/Institut für Werkstofftechnik/Institute for materials science; Dr. rer. nat. Frank Gärtner, frank.gaertner@hsu-hh.de, HSU/Institut für Werkstofftechnik/Institute for materials science; Univ.-Prof. Dr.–Ing. habil. Thomas Klassen, thomas.klassen@hsu-hh.de, HSU/Institut für Werkstofftechnik/Institute for materials science; 

Cold spray (CS) has great potential as a structural repair technique. However, the process-inherent strain hardening as well as not fully bonded interfaces limit deposit strength and strain to failure. Additional heat input can enable recrystallisation and surface diffusion at non-bonded interfaces to enhance properties. In contrast to isothermal heat treatments, localized surface heating can minimize the thermal load to the substrate or part. Using induction or laser heating, local in-situ surface treatments can be combined directly with the CS process, but require careful tuning to avoid over-aging of the part. In this study, as a simpler approach, the effect of an in-situ radiant heater on surface temperatures and deposit quality was evaluated in single-line trials. Influences on material deposition and microstructure due to the heat input were investigated by optical microscopy for analyzing porosities and corresponding build-up deposit shapes. The results proof the use of an in-situ radiant heater as an easy way of raising surface temperatures to improve deposit properties, without in-depth heating of the substrate.

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Erscheinungsdatum

March 2026

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