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Carbon Particle In-Situ Alloying of the Case-Hardening Steel 16MnCr5 in Laser Powder Bed Fusion

: Schmitt, Matthias; Gottwalt, Albin; Winkler, Jakob; Tobie, Thomas; Schlick, Georg; Stahl, Karsten; Tetzlaff, Ulrich; Schilp, Johannes; Reinhart, Gunther

Fulltext urn:nbn:de:0011-n-6360233 (33 MByte PDF)
MD5 Fingerprint: 0ccbb5f5869193fd17e557296d817150
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Created on: 17.6.2021

Metals 11 (2021), No.6, Art. 896, 15 pp.
ISSN: 2075-4701
Journal Article, Electronic Publication
Fraunhofer IGCV ()
additive Fertigung; Multimaterial; Selektives Laserstrahlschmelzen; Einsatzstahl; Legierung

The carbon content of steel affects many of its essential properties, e.g., hardness and mechanical strength. In the powder bed fusion process of metals using a laser beam (PBF-LB/M), usually, pre-alloyed metal powder is solidified layer-by-layer using a laser beam to create parts. A reduction of the carbon content in steels is observed during this process. This study examines adding carbon particles to the metal powder and in situ alloying in the PBF-LB/M process as a countermeasure. Suitable carbon particles are selected and their effect on the particle size distribution and homogeneity of the mixtures is analysed. The workability in PBF-LB is then shown. This is followed by an evaluation of the resulting mechanical properties (hardness and mechanical strength) and microstructure in the as-built state and the state after heat treatment. Furthermore, potential use cases like multi-material or functionally graded parts are discussed.