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Microstructural study of keyhole TIG welded nickel-based superalloy G27
University West, Department of Engineering Science, Division of Welding Technology. (KAMPT)
Manitoba Institute for Materials, University of Manitoba, Winnipeg, MB R3T2N2 (CAN).
University West, Department of Engineering Science, Division of Welding Technology. (KAMPT)ORCID iD: 0000-0001-9065-0741
Department of Mechanical Engineering, University of Manitoba, Winnipeg, MB R3T 5V6 (CAN).
2023 (English)In: Materials Characterization, Vol. 204, article id 113178Article in journal (Refereed) Epub ahead of print
Abstract [en]

The weld fusion zone (FZ) microstructure obtained after keyhole tungsten inert gas welding and post-weld solution heat treatments (PWSHTs) of a new nickel (Ni)-based superalloy called G27 is studied, and the grain growth behavior in the base material (BM) during PWSHTs is characterized. Microsegregation-induced interdendritic microconstituents in the FZ of as-welded G27 are identified by analytical (scanning) transmission electron microscopy ((S)TEM) as niobium (Nb)-rich MC carbides, Nb-rich Laves eutectic constituents, γ’ and η phases. The Laves eutectics are generally considered brittle and can adversely affect the mechanical properties of the weldment; thus, an hour PWSHTs were performed at 954 °C–1060 °C to eliminate the γ/Laves eutectics. PWSHT up to 1010 °C results in only partial removal of Laves eutectics with an excessive formation of η phase surrounding the Laves phase. Complete dissolution of Laves eutectics with no η phase formation is achieved after a PWSHT is performed at 1060 °C. Relative to INCONEL® alloy 718, the complete elimination of the γ/Laves eutectic constituents in the FZ of G27 through a PWSHT was proven to be achieved without causing excessive grain growth in the BM, which could be due to the pinning effect of the fine molybdenum (Mo)-rich precipitates, that are formed during solution heat treatment and identified as hexagonal close-packed phase particles through extensive (S)TEM analyses.

Place, publisher, year, edition, pages
2023. Vol. 204, article id 113178
Keywords [en]
K-TIG welding, Weld solidification, Laves phase, Grain growth, G27, Superalloy
National Category
Manufacturing, Surface and Joining Technology
Research subject
Production Technology
Identifiers
URN: urn:nbn:se:hv:diva-20698DOI: 10.1016/j.matchar.2023.113178ISI: 001046857400001Scopus ID: 2-s2.0-85165231465OAI: oai:DiVA.org:hv-20698DiVA, id: diva2:1809035
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CC BY 4.0

Available from: 2023-11-01 Created: 2023-11-01 Last updated: 2023-11-01

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Ariaseta, AchmadAndersson, Joel

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