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Analytical STEM Investigations of Nozzle Vane Surfaces after Turbine Engine Operation

Published online by Cambridge University Press:  30 July 2021

Radosław Swadźba Open the ORCID record for Radosław Swadźba [Opens in a new window] ,
Bogusław Mendala  and
Ondřej Dvořáček
Radosław Swadźba*
Affiliation:
Łukasiewicz Research Network, Institute for Ferrous Metallurgy, 44-100 Gliwice, Poland
Bogusław Mendala
Affiliation:
Materials Science Department, Silesian University of Technology, 40-019 Katowice, Poland
Ondřej Dvořáček
Affiliation:
PBS Velká Bíteš, a.s., Velká Bíteš, Czech Republic
*
*Corresponding author: Radosław Swadźba, E-mail: rswadzba@imz.pl
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Abstract

The scope of this work includes detailed microstructural investigations using high-resolution scanning transmission electron microscopy of the oxide scales and deposits formed on nozzle ring vanes made of IN713LC alloy during the operation of an auxiliary power unit under real conditions. The paper presents the differences of oxidation processes between the suction and the pressure sides of the vanes. It has been shown that in the pressure side of the vane, where a greater flow of exhaust gases from the combustion chamber is present, the oxidation process is accompanied by a deposition of among others (i.a.) Fe, Mg, Ca, Na, and P, while on the suction side of the vane, the thermal stresses and the mechanical loading most likely lead to a cracking of the oxide scale. A segregation of Cr, Ni, Ta, and Ti to the boundaries of α-Al2O3 grains is observed, which may indicate their diffusion from a metal to a gas atmosphere.

Keywords

aluminahigh-temperature oxidationscanning transmission electron microscopysuperalloysturbines
Type
The XVIIth International Conference on Electron Microscopy (EM2020)
Information
Microscopy and Microanalysis , Volume 28 , Issue 3 , June 2022 , pp. 929 - 938
Copyright
Copyright © The Author(s), 2021. Published by Cambridge University Press on behalf of the Microscopy Society of America

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