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    Novel Pectin Binder for Satelliting Carbides to H13 Tool Steel for PBF-LB Processing

    Year: 2023

    Authors: Meyer, Fabian; Kolodzy, Fabian; Scheck, Marie Luise; Kaletsch, Anke; Kharandiuk, Tetiana; Pich, Andrij; Broeckmann, Christoph

    Keywords: additivation; carbides; laser-based powder bed fusion; microstructure; polymer binder; powder application; tool steel

    In order to enhance the range of processable alloys of laser-based powder bed fusion, reinforced alloys have gained focus. Satelliting is a recently introduced method for adding fine additives to larger parent powder particles using a bonding agent. Satellited particles prevent a local demixing due to size and density effects of the powder. In this study, the satelliting method is used for the additivation of Cr3C2 to AISI H13 tool steel via a functional polymer binder (pectin). The investigation includes a detailed binder analysis and comparison to the previously used PVA binder as well as processability in PBF-LB and the microstructure of the alloy. The results reveal that pectin is a suitable binder for the satelliting process and the demixing behavior that appears when using a simple powder blend can be significantly reduced. However, the alloy is enriched with carbon, which results in austenite being retained. Thus, in future research, a reduced binder content will be investigated.
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