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Modification of Electrical and Mechanical Properties of Selective Laser-Melted CuCr0.3 Alloy Using Carbon Nanoparticles
KTH, School of Industrial Engineering and Management (ITM), Production Engineering.
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2019 (English)In: Advanced Engineering Materials, ISSN 1438-1656, E-ISSN 1527-2648, Vol. n/a, no n/a, article id 1900946Article in journal (Refereed) Published
Abstract [en]

Herein, the influence of carbon nanoparticle addition on the selective laser melting (SLM) behavior and the resultant properties of gas-atomized CuCr0.3 powder are investigated. The carbon addition neither affects the powder flowability, nor its packing density, but it significantly enhances the optical absorption for infrared radiation. Despite the improved optical absorption of the powder bed after carbon addition, a comparable SLM behavior is observed for both virgin and carbon-mixed CuCr0.3 powders. Furthermore, the addition of carbon nanoparticles facilitates in situ deoxidation of copper and chromium oxides present in the CuCr0.3 powder. Accordingly, a larger fraction of chromium is obtained in its metallic form in the as-built carbon-mixed CuCr0.3 part. The presence of metallic chromium allows tailoring of the mechanical and electrical properties by postheat treatments (HTs). The best combination of mechanical (tensile strength of 298?±?19?MPa, yield strength of 208?±?18?MPa, ductility of 21?±?4%) and electrical (87?±?1% international annealed copper standards [% IACS]) properties is realized for the carbon-mixed CuCr0.3 alloy after a direct age hardening HT. The improvement in mechanical properties is attributed to the precipitation of nanometer-sized, coherent, and metallic chromium precipitates in the copper matrix.

Place, publisher, year, edition, pages
John Wiley & Sons, 2019. Vol. n/a, no n/a, article id 1900946
Keywords [en]
additive manufacturing, carbon-mixed CuCr0.3, copper reflectivities, optical absorption, precipitation strengthening
National Category
Materials Engineering
Identifiers
URN: urn:nbn:se:kth:diva-264579DOI: 10.1002/adem.201900946Scopus ID: 2-s2.0-85075752786OAI: oai:DiVA.org:kth-264579DiVA, id: diva2:1374370
Conference
2019/11/29
Note

QC 20191204

Available from: 2019-11-29 Created: 2019-11-29 Last updated: 2020-03-09Bibliographically approved

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