Electron Microscopy Characterization of the High Temperature Degradation of the Aluminide Layer on Turbine Blades Made of a Nickel Superalloy

Mariusz Bogdan , Witold Zieliński , Tomasz Płociński , Krzysztof Kurzydłowski

Abstract

The effects of exposure to overheating (temperature above 1000 °C) on the degradation (modification) of layers of coatings (coatings based on aluminum) of uncooled polycrystalline rotor blades of aircraft turbine jet engines were investigated under laboratory conditions. In order to determine the nature of the changes as well as the structural changes in the various zones, a multi-factor analysis of the layers of the coating, including the observation of the surface of the blades, using, among others, electron microscopy, structural tests, surface morphology, and chemical composition testing, was carried out. As a result of the possibility of strengthening the physical foundations of the non-destructive testing of blades, the undertaken research mainly focused on the characteristics of the changes occurring in the outermost layers of the coatings. The obtained results indicate the structural degradation of the coatings, particularly the unfavorable changes, become visible after heating to 1050 °C. The main, strongly interacting, negative phenomena include pore formation, external diffusion of Fe and Cr to the surface, and the formation and subsequent thickening of Fe-Cr particles on the surface of the alumina layer.
Author Mariusz Bogdan - Bialystok University of Technology (PB)
Mariusz Bogdan,,
-
, Witold Zieliński (FMSE / DMD)
Witold Zieliński,,
- Division of Materials Design
, Tomasz Płociński (FMSE / DMD)
Tomasz Płociński,,
- Division of Materials Design
, Krzysztof Kurzydłowski (FMSE / DMD) - [Bialystok University of Technology (PB)]
Krzysztof Kurzydłowski,,
- Division of Materials Design
- Politechnika Białostocka
Journal seriesMaterials, ISSN 1996-1944
Issue year2020
Vol13
No14
Pages32-40
Publication size in sheets162
Keywords in Englishturbine blade; nickel-based superalloys; aluminide layer; high temperature; electron microscopy
ASJC Classification2500 General Materials Science
DOIDOI:10.3390/ma13143240
URL https://www.mdpi.com/1996-1944/13/14/3240
Languageen angielski
LicenseJournal (articles only); author's original; Uznanie Autorstwa (CC-BY); after publication
File
materials-13-03240.pdf 6.91 MB
Score (nominal)140
Score sourcejournalList
ScoreMinisterial score = 140.0, 15-09-2020, ArticleFromJournal
Publication indicators Scopus SNIP (Source Normalised Impact per Paper): 2017 = 1.285; WoS Impact Factor: 2018 = 2.972 (2) - 2018=3.532 (5)
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