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Influence of laser exposure time and point distance on 75-μm-thick layer of selective laser melted Alloy 718
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 Welding Technology. (PTW)
University West, Department of Engineering Science, Division of Welding Technology. (PTW)ORCID iD: 0000-0001-9065-0741
University West, Department of Engineering Science, Division of Welding Technology. (PTW)ORCID iD: 0000-0003-2560-0531
2018 (English)In: The International Journal of Advanced Manufacturing Technology, ISSN 0268-3768, E-ISSN 1433-3015, Vol. 94, no 5-8, p. 2199-2207Article in journal (Refereed) Published
Abstract [en]

A systematic matrix with 25 samples, using five different point distances and five laser exposure times, depositing 75-μm-thick layers of Alloy 718 has been studied. The work has concentrated on defects formed, hardness of the deposits, and the microstructure. Relatively large amount of defects, both lack of fusion and porosity, was found in several of the specimens in the deposits. The defects were never possible to fully eliminate, but a significant decrease, mainly in the lack of fusion, was seen with increasing laser exposure time. The gas porosity on the other hand was not affected to any larger degree, except for the lowest laser energy input, where a slight increase in porosity was seen. A small increase in hardness was noted with increasing laser energy input. The width of the deposited beads increased with increasing laser energy, while the depth of deposits was more or less constant. However, for the lowest combination of point distance and laser exposure time, quite deep and narrow beads were formed. A comparison was made with deposition of 50-μm-thick layers, with quite similar laser energy input, but with some variation in detailed deposition parameters. It was found that the 75-μm-thick layers contained less lack of fusion, particularly for small point distances. The amount of porosity was also less, but that did not vary with deposition parameters.© 2017 The Author(s)

Place, publisher, year, edition, pages
Springer London , 2018. Vol. 94, no 5-8, p. 2199-2207
Keywords [en]
3D printers; Defects; Deposition; Deposits; Hardness; Microstructure, Alloy 718; Deposition Parameters; Large amounts; Laser energies; Laser exposure; Point distances; Selective laser melting; Small points, Porosity
National Category
Manufacturing, Surface and Joining Technology
Research subject
Production Technology; ENGINEERING, Manufacturing and materials engineering
Identifiers
URN: urn:nbn:se:hv:diva-11886DOI: 10.1007/s00170-017-1019-1Scopus ID: 2-s2.0-85028818109OAI: oai:DiVA.org:hv-11886DiVA, id: diva2:1163015
Note

First Online: 06 September 2017

Available from: 2017-12-05 Created: 2017-12-05 Last updated: 2018-02-20Bibliographically approved

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Karimi Neghlani, PariaRaza, TahiraAndersson, JoelSvensson, Lars-Erik

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Karimi Neghlani, PariaRaza, TahiraAndersson, JoelSvensson, Lars-Erik
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Division of Subtractive and Additive ManufacturingDivision of Welding Technology
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Manufacturing, Surface and Joining Technology

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