Quantitative microstructural characterisation of Ni-base superalloys

The Ni-base superalloy Waspaloy was investigated as candidate material for rotor and disc applications in steam turbines of the next generation. Quantitative metallography has been performed using various microscopic techniques. Transmission electron microscopy (TEM) and atomic force microscopy (AFM...

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Bibliographic Details
Published in:Materials chemistry and physics 2003-08, Vol.81 (2-3), p.417-423
Main Authors: Penkalla, H.J, Wosik, J, Czyrska-Filemonowicz, A
Format: Article
Language:English
Subjects:
AFM
Condensed matter: structure, mechanical and thermal properties
Electron, ion, and scanning probe microscopy
Exact sciences and technology
HRTEM
Physics
Stereological evaluation
Structure of solids and liquids
crystallography
TEM
Waspaloy
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Summary:The Ni-base superalloy Waspaloy was investigated as candidate material for rotor and disc applications in steam turbines of the next generation. Quantitative metallography has been performed using various microscopic techniques. Transmission electron microscopy (TEM) and atomic force microscopy (AFM) have been applied for a stereological evaluation of the particle size distribution, particle number density and volume fraction of the γ′ precipitates. Waspaloy was investigated after heat treatment and after ageing at relevant application temperature of 700°C. In cooling experiments, the influence of the cooling rate on the γ′ formation and growth was studied. The existence of γ′ nano-stals with a volume fraction
ISSN:0254-0584
1879-3312
DOI:10.1016/S0254-0584(03)00037-3