Microstructural evolution of the heat affected zone of a Co-Ti-W alloy upon laser cladding with a CoNiCrAlY coating

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We report on the microstructural evolution of the heat affected zone of a γ/γ′-strengthened Co–Ti–W alloy upon laser cladding with a CoNiCrAlY coating. Using electron microscopy and atom probe tomography we observed two distinct heat affect zones, namely γ islands containing γ′ precipitate (∼ 45 nm in size) colonies and heat affected γ/γ′ regions outside the γ islands comprising fine γ′ precipitates (∼ 25 nm in size). Based on the experimental data and thermodynamic calculations, we propose a model for the formation of these two heat affected zones and discuss the differences in the observed precipitate sizes.
Publisher
ELSEVIER SCIENCE INC
Issue Date
2019-12
Language
English
Article Type
Article
Citation

MATERIALS CHARACTERIZATION, v.158

ISSN
1044-5803
DOI
10.1016/j.matchar.2019.109998
URI
http://hdl.handle.net/10203/268763
Appears in Collection
MS-Journal Papers(저널논문)
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