Qualification of a Ni-Cu alloy for the laser powder bed fusion process (LPBF): Its microstructure and mechanical properties

  • As researchers continue to seek the expansion of the material base for additive manufacturing, there is a need to focus attention on the Ni–Cu group of alloys which conventionally has wide industrial applications. In this work, the G-NiCu30Nb casting alloy, a variant of the Monel family of alloys with Nb and high Si content is, for the first time, processed via the laser powder bed fusion process (LPBF). Being novel to the LPBF processes, optimum LPBF parameters were determined, and hardness and tensile tests were performed in as-built conditions and after heat treatment at 1000 °C. Microstructures of the as-cast and the as-built condition were compared. Highly dense samples (99.8% density) were achieved after varying hatch distance (80 µm and 140 µm) with scanning speed (550 mm/s–1500 mm/s). There was no significant difference in microhardness between varied hatch distance print sets. Microhardness of the as-built condition (247 HV0.2) exceeded the as-cast microhardness (179 HV0.2.). Tensile specimens built in vertical (V) and horizontal (H) orientations revealed degrees of anisotropy and were superior to conventionally reported figures. Post heat treatment increased ductility from 20% to 31% (V), as well as from 16% to 25% (H), while ultimate tensile strength (UTS) and yield strength (YS) were considerably reduced.

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Author:Iris Raffeis, Frank Adjei-Kyeremeh, Uwe Vroomen, Elmar Westhoff, Sebastian Bremen, Alexandru Hohoi, Andreas Bührig-Polaczek
DOI:https://doi.org/10.3390/app10103401
ISSN:2076-3417
Parent Title (English):Applied Sciences
Publisher:MDPI
Place of publication:Basel
Document Type:Article
Language:English
Year of Completion:2020
Date of the Publication (Server):2020/08/07
Volume:10
Issue:Art. 3401
First Page:1
Last Page:15
Note:
Special Issue Materials Development by Additive Manufacturing Techniques
Link:https://doi.org/10.3390/app10103401
Zugriffsart:weltweit
Institutes:FH Aachen / Fachbereich Maschinenbau und Mechatronik
open_access (DINI-Set):open_access
collections:Verlag / MDPI
Open Access / Gold
Licence (German): Creative Commons - Namensnennung