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Microstructural study of keyhole TIG welded nickel-based superalloy G27
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- Ariaseta, Achmad (author)
- Högskolan Väst,Avdelningen för svetsteknologi (SV),Department of Metallurgical Engineering, Faculty of Mining and Petroleum Engineering, Institut Teknologi Bandung, Jl. Ganesha 10, Bandung 40132 (IDN),KAMPT
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- Khan, Abdul Khaliq (author)
- Manitoba Institute for Materials, University of Manitoba, Winnipeg (CAN)
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- Andersson, Joel, 1981- (author)
- Högskolan Väst,Avdelningen för svetsteknologi (SV),KAMPT
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- Elsevier, 2023
- 2023
- English.
- In: Materials Characterization. - : Elsevier. - 1044-5803 .- 1873-4189. ; 204
- Journal article (peer-reviewed)
Abstract
Subject headings
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- 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.
Subject headings
- TEKNIK OCH TEKNOLOGIER -- Materialteknik -- Bearbetnings-, yt- och fogningsteknik (hsv//swe)
- ENGINEERING AND TECHNOLOGY -- Materials Engineering -- Manufacturing, Surface and Joining Technology (hsv//eng)
Keyword
- K-TIG welding
- Weld solidification
- Laves phase
- Grain growth
- G27
- Superalloy
- Production Technology
- Produktionsteknik
Publication and Content Type
- ref (subject category)
- art (subject category)
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