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Fourth-generation single crystal nickel base superalloy for jet engine turbine blades application. 3D imaging and metrology of microstructure elements

Ziętara Maciej, Kruk Adam, Cempura Grzegorz, Gruszczyński Adam, Czyrska-Filemonowicz Aleksandra

Inżynieria Materiałowa

2020

Vol. 41, nr 3

12--17

Fourth-generation single crystal nickel base superalloy (PWA 1497) used for turbine blades application were subjected to three-dimensional micro- structural analysis. The FIB-SEM tomography was performed on the as received and creep deformed samples in order to visualize and quantify the microstructure elements of γ and γ’ phases. The results of 3D microstructural quantitative analysis were compared with the complementary results obtained by means of 2D TEM analysis. It was demonstrated that for modern single crystal nickel base superalloys, the measurements of the relative area fraction (A A) of γ’ phase in 2D images are adequate for measurements of the volume fraction (V V ) of this phase (A A ≅ V V ). Microstructural changes of the investigated superalloy revealed in 3D space were found to be much more complex than images of this microstructure obtained by electron microscopy techniques in two-dimensional space (2D).