Papers by Author: Adam Kruk

Abstract: The aim of this study was presentation the results of new tomographic techniques application to characterize structural elements in nickel-based superalloys for disc and blades using in aircraft engines and gas turbines in energy systems. Visualization of phases presented in as-service high chromium creep resistant steel for modern power plant applications was also performed using STEM-EDX and FIB-SEM electron tomography. Electron tomography (STEM-EDX) and FIB-SEM tomography were used for 3D imaging and metrology of the precipitates. Transmission electron microscopy and TEM-EDX spectroscopy were used to reveal details of the superalloys and steel microstructures and phases’ chemical compositions. 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.

Abstract: In the present work a quantitative analysis of γ' and γ" phase nanoparticles in Inconel 718 was performed using two methods of electron tomography, namely EFTEM and FIB tomography. 3D visualisation showed that γ' particles are spherical, while γ" precipitates are disc-shaped. The values of mean size of γ' and γ" phase particles, determined by both electron tomography methods applied, are in good agreement.