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Published in: Physics of Metals and Metallography 14/2021

18-08-2021 | STRENGTH AND PLASTICITY

Monotonic and Cyclic Stress–Strain Behavior of Uncoated and Coated Superalloy Rene®80 at Elevated Temperature

Authors: M. M. Barjesteh, S. M. Abbasi, K. Zangeneh Madar, K. Shirvani

Published in: Physics of Metals and Metallography | Issue 14/2021

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Abstract

Polycrystalline cast superalloy Rene®80 is extensively used for manufacturing turbine blades of aero-turbojet engines. Therefore it is under cyclic stress–strain loads such as operation and shutdown. Turbine blades are usually coated to increase their high temperature oxidation/corrosion resistance. In this study, influence of a low temperature-high activity (LTHA) platinum–aluminide (Pt–Al) coating with an initial layer of 6µm platinum, on the tensile (monotonic stress–strain) and low cycle fatigue (cyclic stress–strain) properties of Rene®80, at 800°C, has been evaluated. The coating microstructure consisted of an outer bi-phase (PtAl2 in a matrix of (Ni,Pt)–Al) layer, an intermediate (Ni,Pt)–Al layer (single phase) and an inter-diffusion zone (IDZ). The results of hot tensile tests at 800°C showed a decrease in ultimate and yield strength properties of the coated specimens about 5–6% compared to the uncoated ones. Also results of low cycle fatigue tests under strain-controlled condition at 800°C for R = 0 and strain rate of 2 × 10–3 s–1, at a total strain range of 0.8% indicated a declination in fatigue strength of Rene®80 after applying Pt–Al coating at 800°C. Results of fractographic studies on coated and uncoated specimens revealed a combination of ductile and brittle failure mechanisms at both states. Although the fatigue crack was nucleated on the oxidized surface layer in the uncoated specimens, it started from the coating in the coated specimens at 800°C.
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Metadata
Title
Monotonic and Cyclic Stress–Strain Behavior of Uncoated and Coated Superalloy Rene®80 at Elevated Temperature
Authors
M. M. Barjesteh
S. M. Abbasi
K. Zangeneh Madar
K. Shirvani
Publication date
18-08-2021
Publisher
Pleiades Publishing
Published in
Physics of Metals and Metallography / Issue 14/2021
Print ISSN: 0031-918X
Electronic ISSN: 1555-6190
DOI
https://doi.org/10.1134/S0031918X21140040