Bartels D, Novotny T, Schmidt M (2023)
Publication Type: Book chapter / Article in edited volumes
Publication year: 2023
Publisher: Springer
Edited Volumes: Additive Manufacturing in Multidisciplinary Cooperation and Production
Series: Springer Tracts in Additive Manufacturing
City/Town: Cham
Pages Range: 115-124
ISBN: 9783031376702
DOI: 10.1007/978-3-031-37671-9_10
Low-alloyed steels are used in various application fields like gearing and bearing technology. The hardenability of these steels is mainly determined by the carbon content, which increases the strength of the martensitic phase. Since low-alloyed steels typically possess a low carbon content below 0.2 wt.%, an additional post-process heat treatment in a carbon-rich atmosphere is necessary to increase the carbon concentration in the product’s case. Another potential approach for improving the strength of the part’s surface is provided by applying additive manufacturing processes like laser-based directed energy deposition (DED-LB/M). Powder-based DED-LB/M supports in-situ alloying since multiple powder hoppers can be used for supplying the different powder materials. By adding e.g., carbon or hard particles, the hardness and wear resistance of the part can be tailored to the needs of the final application. However, to exploit the potentials of in-situ alloying for the deposition of optimized structures, the influence of the chemical composition, especially the carbon content, on the resulting material properties needs to be known. Within this work, the low-alloyed steel Bainidur AM (0.23 wt.% C) is processed by means of DED-LB/M. Furthermore, elemental carbon nanoparticles are added to increase the total carbon concentration up to 0.3 wt.%, 0.35 wt.%, and 0.4 wt.% within the powder. Multiple layers are manufactured to investigate the underlying material properties. The relative part density is only barely affected by the different carbon contents. Furthermore, the increased carbon content did not result in an increased crack tendency. Light optical microscopy reveals a primarily martensitic microstructure for all carbon contents. The material hardness increases linearly with increasing carbon concentration. Whereas the hardness of the unmodified Bainidur AM falls in the range of just below 400 HV1, a maximum hardness of around 560 HV1 was observed for a carbon content of 0.4 wt.%.
APA:
Bartels, D., Novotny, T., & Schmidt, M. (2023). Influence of Carbon Content on the Material Properties of Low-Alloyed Steel Bainidur AM. In Additive Manufacturing in Multidisciplinary Cooperation and Production. (pp. 115-124). Cham: Springer.
MLA:
Bartels, Dominic, Tobias Novotny, and Michael Schmidt. "Influence of Carbon Content on the Material Properties of Low-Alloyed Steel Bainidur AM." Additive Manufacturing in Multidisciplinary Cooperation and Production. Cham: Springer, 2023. 115-124.
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