Microstructure and creep resistance of a diffusionally aluminized Ni-base superalloy

An aluminide layer was formed on a wrought Ni-base superalloy by the diffusional aluminizing method, which involves a physical vapor deposition of Al followed by two-step heat treatment in vacuum. Microstructural analysis revealed the presence of an aluminide layer, inter-diffusion zone (IDZ), and affected substrate, all of which developed due to the inter-diffusion of deposited Al and elements in the matrix. In addition, a wide carbide free zone, in which grain boundaries were mostly denuded of carbides, was found below the IDZ. Depth profiling analysis using a glow discharge spectrometer confirmed the reduced carbon content in the carbide free zone. At 900 A degrees C, the diffusionally aluminized specimens showed a decrease in creep-rupture life caused by the presence of the carbide free zone. Fracture surface and cross-section microstructure observation confirmed the detrimental effect of the carbide free zone on the creep resistance of the diffusionally aluminized Alloy 617
Publisher
KOREAN INST METALS MATERIALS
Issue Date
2016-11
Language
ENG
Keywords

SINGLE-CRYSTAL SUPERALLOY; HIGH-TEMPERATURE AIR; ALLOY 617; HELIUM ENVIRONMENTS; RUPTURE PROPERTIES; HEAT-TREATMENT; OXIDATION; COATINGS; BEHAVIOR; KINETICS

Citation

METALS AND MATERIALS INTERNATIONAL, v.22, no.6, pp.1033 - 1040

ISSN
1598-9623
DOI
10.1007/s12540-016-6218-z
URI
http://hdl.handle.net/10203/214824
Appears in Collection
NE-Journal Papers(저널논문)
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