Microstructural study of keyhole TIG welded nickel-based superalloy G27

被引：5

作者：

Ariaseta, Achmad ^{[1
,4
]}

Khan, Abdul Khaliq ^{[3
]}

Andersson, Joel ^{[1
]}

Ojo, Olanrewaju ^{[2
]}

机构：

[1] Univ West, Dept Engn Sci, SE-46186 Trollhattan, Sweden

[2] Univ Manitoba, Dept Mech Engn, Winnipeg, MB R3T 5V6, Canada

[3] Univ Manitoba, Manitoba Inst Mat, Winnipeg, MB R3T2N2, Canada

[4] Inst Teknol Bandung, Fac Min & Petr Engn, Dept Met Engn, Jl Ganesha 10, Bandung 40132, Indonesia

来源：

MATERIALS CHARACTERIZATION | 2023年 / 204卷

基金：

瑞典研究理事会;

关键词：

K-TIG welding; Weld solidification; Laves phase; Grain growth; G27; Superalloy; NB-BEARING SUPERALLOYS; GRAIN-GROWTH; FUSION ZONE; SOLIDIFICATION; INCONEL-718; BEHAVIOR;

D O I：

10.1016/j.matchar.2023.113178

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

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, & gamma;' and & eta; 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 degrees C-1060 degrees C to eliminate the & gamma;/Laves eutectics. PWSHT up to 1010 degrees C results in only partial removal of Laves eutectics with an excessive formation of & eta; phase surrounding the Laves phase. Complete dissolution of Laves eutectics with no & eta; phase formation is achieved after a PWSHT is performed at 1060 degrees C. Relative to INCONEL & REG; alloy 718, the complete elimination of the & gamma;/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.

引用

页数：17

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