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Precipitation behavior of gamma′ precipitates in the fusion zone of TIG welded ATI 718Plus®
University of Manitoba, Winnipeg, R3T 5V6, Canada .
University West, Department of Engineering Science, Division of Mechanical Engineering. (PTW)ORCID iD: 0000-0001-9065-0741
University of Manitoba, Winnipeg, R3T 5V6, Canada .
2016 (English)In: The International Journal of Advanced Manufacturing Technology, ISSN 0268-3768, E-ISSN 1433-3015, Vol. 87, no 9-12, p. 2721-2729Article in journal (Refereed) Published
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Abstract [en]

The precipitation behavior of the main strengthening phase, γ′ precipitates, in ATI 718Plus® superalloy after Tungsten Inert Gas (TIG) welding and postweld heat treatments has been studied. In contrast to electron beam welding, where no γ′ precipitates are reported to form in the as-welded condition, analytical transmission electron microscopy study in this work revealed the formation of γ′ precipitates after the TIG welding, albeit in a non-uniform distribution manner. This is attributable to a more extensive elemental microsegregation that occurred into the interdendritic liquid and slower cooling rate during the TIG welding, which also induced the formation of interdendritic Nb-rich Laves phase particles and MC-type carbides. Theoretical calculations were performed to study the influence of Nb microsegregation, on both the kinetics and extent of γ′ precipitation, and the results agree with experimental observations. It is found that the precipitation kinetics, and not the extent of γ′ precipitate formation in the fusion zone, during postweld heat treatments is affected by the micro-segregation of Nb that produced Laves phase particles during the weld solidification.

Place, publisher, year, edition, pages
2016. Vol. 87, no 9-12, p. 2721-2729
Keywords [en]
Superalloy, Welding ATI, 718+
National Category
Manufacturing, Surface and Joining Technology
Research subject
ENGINEERING, Manufacturing and materials engineering
Identifiers
URN: urn:nbn:se:hv:diva-9308DOI: 10.1007/s00170-016-8642-0ISI: 000388988300023Scopus ID: 2-s2.0-84962018767OAI: oai:DiVA.org:hv-9308DiVA, id: diva2:919093
Note

First online: 02 April 2016

Funders: Natural Sciences and Engineering Research Council, NSERC, Canada.

Available from: 2016-04-13 Created: 2016-04-11 Last updated: 2019-02-15Bibliographically approved

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Andersson, Joel

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