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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).

STEM-EDX and FIB-SEM Tomography of ALLVAC 718Plus Superalloy

Kruk A., Cempura G., Lech S., Czyrska-Filemonowicz A.

Archives of Metallurgy and Materials

2016

Vol. 61, iss. 2A

535--542

Allvac 718Plus (718Plus) is a high strength, corrosion resistant nickel- based superalloy used for application in power generation, aeronautics and aerospace industry. The 718Plus microstructure consists of a γ matrix with γ’-Ni3(Al,Ti) and some δ- Ni3Nb phases as well as lamellar particles (η-Ni3Ti, η*-Ni6AlNb or Ni6(Al,Ti)Nb) precipitated at the grain boundaries. The primary strengthening mechanism for this alloy is a precipitation hardening, therefore size and distribution of precipitates are critical for the performance of the alloy. The aim of this study was to characterize precipitates in the 718Plus superalloy using Scanning Transmission Electron Microscope combined with Energy Dispersive X-ray Spectroscopy (STEM-EDX) and Focused Ion Beam Scanning Electron Microscope (FIB-SEM). The STEM-EDX and FIB-SEM tomography techniques were used for 3D imaging and metrology of the precipitates. Transmission electron microscopy and EDX spectroscopy were used to reveal details of the 718Plus microstructure and allow determine chemical composition of the phases. The study showed that electron tomography techniques permit to obtain complementary information about microstructural features (precipitates size, shape and their 3D distribution) in the reconstructed volume with comparison to conventional particle analysis methods, e.g. quantitative TEM and SEM metallography.