Change search
CiteExportLink to record
Permanent link

Direct link
Cite
Citation style
  • apa
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Other style
More styles
Language
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Other locale
More languages
Output format
  • html
  • text
  • asciidoc
  • rtf
Columnar-to-equiaxed grain transition in powder bed fusion via mimicking casting solidification and promoting in situ recrystallization
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
University West, Department of Engineering Science, Division of Subtractive and Additive Manufacturing. GE Additive | Arcam EBM, Mölnlycke (SWE). (PTW)
Multi‑Scale Additive Manufacturing Lab, Department of Mechanical and Mechatronics Engineering, University of Waterloo, Waterloo (CAN).
Show others and affiliations
2021 (English)In: Additive Manufacturing, ISSN 2214-8604, E-ISSN 2214-7810, Vol. 46, article id 102086Article in journal (Refereed) Published
Abstract [en]

Columnar grain structure typically formed along the build direction in the electron beam-powder bed fusion (EBPBF) technique leads to anisotropic physical and mechanical properties. In this study, casting solidification condition was mimicked, and in situ recrystallization was promoted in EB-PBF to facilitate columnar-to-equiaxed grain structure transition in Alloy 718. This is achieved via a unique linear melting strategy coupled with a specific selection of process parameters in EB-PBF. It was found that site-specific melting using line order number (LON) function affected the cooling rate and temperature gradient, which controlled grain morphology and texture. A high LON resulted in a large equiaxed grain zone with a random texture, whereas a fixed LON with a high areal energy density led to a strong texture. The main driving force in the formation of cracks and shrinkage defects during the transition was investigated. A high LON at a fixed areal energy density reduced the average total shrinkage defects and crack length. The hardness was decreased through the transition, which was linked to the reduction in the size of the gamma ‘’ precipitates.

Place, publisher, year, edition, pages
ELSEVIER , 2021. Vol. 46, article id 102086
Keywords [en]
Additive manufacturing; Electron beam-powder bed fusion; Alloy 718; In situ recrystallization; Grain structure
National Category
Manufacturing, Surface and Joining Technology Metallurgy and Metallic Materials
Research subject
Production Technology
Identifiers
URN: urn:nbn:se:hv:diva-17560DOI: 10.1016/j.addma.2021.102086ISI: 000697020200002Scopus ID: 2-s2.0-85110462749OAI: oai:DiVA.org:hv-17560DiVA, id: diva2:1609515
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: 2021-11-08 Created: 2021-11-08 Last updated: 2022-03-31

Open Access in DiVA

Additive Manufacturing(26537 kB)587 downloads
File information
File name FULLTEXT01.pdfFile size 26537 kBChecksum SHA-512
e9e1a28da628997e9568d506d456681deca8420f297d28eb3a4dc2e6f78442bce2c5a7ad726d0ae3db20fab711fe8eeedab5e63fe6100569dbca48852e3d5b54
Type fulltextMimetype application/pdf

Other links

Publisher's full textScopus

Authority records

Karimi Neghlani, PariaSadeghi, EsmaeilÅlgårdh, JoakimAndersson, Joel

Search in DiVA

By author/editor
Karimi Neghlani, PariaSadeghi, EsmaeilÅlgårdh, JoakimAndersson, Joel
By organisation
Division of Subtractive and Additive ManufacturingDivision of Welding Technology
In the same journal
Additive Manufacturing
Manufacturing, Surface and Joining TechnologyMetallurgy and Metallic Materials

Search outside of DiVA

GoogleGoogle Scholar
Total: 587 downloads
The number of downloads is the sum of all downloads of full texts. It may include eg previous versions that are now no longer available

doi
urn-nbn

Altmetric score

doi
urn-nbn
Total: 90 hits
CiteExportLink to record
Permanent link

Direct link
Cite
Citation style
  • apa
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Other style
More styles
Language
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Other locale
More languages
Output format
  • html
  • text
  • asciidoc
  • rtf