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Process development for laser powder bed fusion of GRCop-42 using a 515 nm laser source
Fraunhofer Institute for Material and Beam Technology IWS, 01277, Dresden, Germany.ORCID iD: 0000-0001-8516-9339
Fraunhofer Institute for Material and Beam Technology IWS, 01277, Dresden, Germany.ORCID iD: 0000-0003-1716-2156
Fraunhofer Institute for Material and Beam Technology IWS, 01277, Dresden, Germany.ORCID iD: 0000-0002-4764-8133
Fraunhofer Institute for Material and Beam Technology IWS, 01277, Dresden, Germany.ORCID iD: 0000-0001-9524-2018
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2023 (English)In: Journal of laser applications, ISSN 1042-346X, E-ISSN 1938-1387, Vol. 35, no 4, article id 042078Article in journal (Refereed) Published
Abstract [en]

Copper is widely used in high heat flux and electrical applications because of its excellent electrical and thermal conductivity properties. Alloying elements such as chromium or nickel are added to strengthen the material, especially for higher temperatures. Cu4Cr2Nb, also known as GRCop-42, is a dispersion-strengthened copper-chromium-niobium alloy developed by NASA for high-temperature applications with high thermal and mechanical stresses such as rocket engines. Additive manufacturing (AM) enables applications with complex functionalized geometries and is particularly promising in the aerospace industry. In this contribution, a parametric study was performed for GRCop-42 and the AM process laser powder bed fusion (PBF-LB/M) using a green laser source for two-layer thicknesses of 30 and 60 µm. Density, electrical conductivity, hardness, microstructure, and static mechanical properties were analyzed. Various heat treatments ranging from 400 to 1000 °C and 30 min to 4 h were tested to increase the electrical conductivity and hardness. For both layer thicknesses, dense parameter sets could be obtained with resulting relative densities above 99.8%. Hardness and electrical conductivity could be tailored in the range of 103-219 HV2 and 24%-88% International Annealed Copper Standard (IACS) depending on the heat treatment. The highest ultimate tensile strength (UTS) obtained was 493 MPa. An aging temperature of 700 °C for 30 min showed the best combination of room temperature properties such as electrical conductivity of 83.76%IACS, UTS of 481 MPa, elongation at break (A) at 24%, and hardness of 125 HV2.

Place, publisher, year, edition, pages
Laser Institute of America , 2023. Vol. 35, no 4, article id 042078
Keywords [en]
copper alloys, GRCop alloys, laser powder bed fusion, green laser, heat treatment, additive manufacturing
National Category
Metallurgy and Metallic Materials
Research subject
Manufacturing Systems Engineering
Identifiers
URN: urn:nbn:se:ltu:diva-103509DOI: 10.2351/7.0001139ISI: 001110766300001Scopus ID: 2-s2.0-85179183511OAI: oai:DiVA.org:ltu-103509DiVA, id: diva2:1824739
Note

Validerad;2024;Nivå 2;2024-03-18 (signyg);

Note: Paper published as part of the special topic on Proceedings of the International Congress of Applications of Lasers & Electro-Optics 2023;

Funder: Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e. V.;

Full text license: CC BY

Available from: 2024-01-08 Created: 2024-01-08 Last updated: 2024-03-18Bibliographically approved

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Brueckner, Frank

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