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Influence of build layout and orientation on microstructural characteristics of electron beam melted Alloy 718
Univ West, Sweden.
Univ West, Sweden.
Linköping University, Department of Management and Engineering, Engineering Materials. Linköping University, Faculty of Science & Engineering.
Univ Chalmers, Sweden.
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2018 (English)In: The International Journal of Advanced Manufacturing Technology, ISSN 0268-3768, E-ISSN 1433-3015, Vol. 99, no 9-12, p. 2903-2913Article in journal (Refereed) Published
Abstract [en]

Effects of build layout and orientation consisting of (a) height from the build plate (Z-axis), (b) distance between samples, and (c) location in the build plate (X-Y plane) on porosity, NbC fraction, and hardness in electron beam melted (EBM) Alloy 718 were studied. The as-built samples predominantly showed columnar structure with strong amp;lt; 001 amp;gt; crystallographic orientation parallel to the build direction, as well as NbC and delta-phase in inter-dendrites and grain boundaries. These microstructural characteristics were correlated with the thermal history, specifically cooling rate, resulted from the build layout and orientation parameters. The hardness and NbC fraction of the samples increased around 6% and 116%, respectively, as the height increased from 2 to 45 mm. Moreover, by increasing the height, formation of delta-phase was also enhanced associated with lower cooling rate in the samples built with a greater distance from the build plate. However, the porosity fraction was unaffected. Increasing the sample gap from 2 to 10 mm did not change the NbC fraction and hardness; however, the porosity fraction increased by 94%. The sample location in the build chamber influenced the porosity fraction, particularly in interior and exterior areas of the build plate. The hardness and NbC fraction were not dependent on the sample location in the build chamber.

Place, publisher, year, edition, pages
SPRINGER LONDON LTD , 2018. Vol. 99, no 9-12, p. 2903-2913
Keywords [en]
Additive manufacturing; Electron beam melting (EBM); Alloy 718; Hardness; Microstructural characterization
National Category
Manufacturing, Surface and Joining Technology
Identifiers
URN: urn:nbn:se:liu:diva-153508DOI: 10.1007/s00170-018-2621-6ISI: 000452076900065OAI: oai:DiVA.org:liu-153508DiVA, id: diva2:1274636
Note

Funding Agencies|European Regional Development Fund; Simulation and Control of Material affecting Processes (SiCoMap) research group; KK foundation

Available from: 2019-01-02 Created: 2019-01-02 Last updated: 2019-01-02

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CiteExportLink to record
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Citation style
  • apa
  • harvard1
  • ieee
  • modern-language-association-8th-edition
  • vancouver
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  • Other style
More styles
Language
  • de-DE
  • en-GB
  • en-US
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  • nn-NO
  • nn-NB
  • sv-SE
  • Other locale
More languages
Output format
  • html
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  • asciidoc
  • rtf