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Tailored grain morphology via a unique melting strategy in electron beam-powder bed fusion
University West, Department of Engineering Science, Division of Subtractive and Additive Manufacturing. (PTW)ORCID iD: 0000-0001-6610-1486
University West, Department of Engineering Science, Division of Subtractive and Additive Manufacturing. (PTW)ORCID iD: 0000-0002-7663-9631
Arcam-EBM (a GE Additive), 435 33, Mölnlycke (SWE).
University West, Department of Engineering Science, Division of Subtractive and Additive Manufacturing. (PTW)ORCID iD: 0000-0003-0462-0912
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2021 (English)In: Materials Science & Engineering: A, ISSN 0921-5093, E-ISSN 1873-4936, Vol. 824, article id 141820Article in journal (Refereed) Published
Abstract [en]

This study presents a unique melting strategy in electron beam-powder bed fusion of Alloy 718 to tailor the grain morphology from the typical columnar to equiaxed morphology. For this transition, a specific combination of certain process parameters, including low scanning speeds (400-800 mm/s), wide line offsets (300-500 mu m) and a high number of line order (#10) was selected to control local solidification conditions in each melt pool during the process. In addition, secondary melting of each layer with a 90. rotation with respect to primary melting induced more vigorous motions within the melt pools and extensive changes in thermal gradient direction, facilitating grain morphology tailoring. Four different types of microstructures were classified according to the produced grain morphology depending on the overlap zone between two adjacent melt pools, i.e., fully-columnar (overlap above 40 %), fully-equiaxed (overlap below 15 %), mixed columnar-equiaxed grains, and hemispherical melt pools containing mixed columnar-equiaxed grains (overlap similar to 20-25 %). The typical texture was <001>; however, the texture was reduced significantly through the transition from the columnar to equiaxed grain morphology. Along with all four different microstructures, shrinkage defects and cracks were also identified which amount of them reduced by a reduction in areal energy input. The hardness was increased through the transition, which was linked to the growth of the.” precipitates and high grain boundary density in the fully-equiaxed grain morphology.

Place, publisher, year, edition, pages
ELSEVIER SCIENCE SA , 2021. Vol. 824, article id 141820
Keywords [en]
Additive manufacturing; Electron beam-powder-bed fusion; Melting strategy; Grain structure; Alloy 718
National Category
Manufacturing, Surface and Joining Technology Metallurgy and Metallic Materials
Identifiers
URN: urn:nbn:se:hv:diva-17450DOI: 10.1016/j.msea.2021.141820ISI: 000689220800002Scopus ID: 2-s2.0-85111856337OAI: oai:DiVA.org:hv-17450DiVA, id: diva2:1604000
Note

Funding from the “European Regional Development Fund,” the “Simulation and Control of Material affecting Processes” (SiCoMap), and the “Sustainable Manufacturing Through Next-Generation Additive Process” (SUMAN-Next) projects, with funding from the KK foundation, are highly acknowledged

Available from: 2021-10-18 Created: 2021-10-18 Last updated: 2022-04-04

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Materials Science & Engineering A(16691 kB)310 downloads
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Karimi Neghlani, PariaSadeghi, EsmaeilOlsson, JonasAndersson, Joel

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Manufacturing, Surface and Joining TechnologyMetallurgy and Metallic Materials

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