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Tailored grain morphology via a unique melting strategy in electron beam-powder bed fusion
Högskolan Väst, Institutionen för ingenjörsvetenskap, Avdelningen för avverkande och additativa tillverkningsprocesser (AAT). (PTW)ORCID-id: 0000-0001-6610-1486
Högskolan Väst, Institutionen för ingenjörsvetenskap, Avdelningen för avverkande och additativa tillverkningsprocesser (AAT). (PTW)ORCID-id: 0000-0002-7663-9631
Arcam-EBM (a GE Additive), 435 33, Mölnlycke (SWE).
Högskolan Väst, Institutionen för ingenjörsvetenskap, Avdelningen för avverkande och additativa tillverkningsprocesser (AAT). (PTW)ORCID-id: 0000-0003-0462-0912
Vise andre og tillknytning
2021 (engelsk)Inngår i: Materials Science & Engineering: A, ISSN 0921-5093, E-ISSN 1873-4936, Vol. 824, artikkel-id 141820Artikkel i tidsskrift (Fagfellevurdert) 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.

sted, utgiver, år, opplag, sider
ELSEVIER SCIENCE SA , 2021. Vol. 824, artikkel-id 141820
Emneord [en]
Additive manufacturing; Electron beam-powder-bed fusion; Melting strategy; Grain structure; Alloy 718
HSV kategori
Identifikatorer
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
Merknad

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

Tilgjengelig fra: 2021-10-18 Laget: 2021-10-18 Sist oppdatert: 2022-04-04

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

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