Oxidation behaviour of single crystal nickel-based superalloys: intermediate temperature effects at 450–550°C
Oxidation behaviour of single crystal nickel-based superalloys: intermediate temperature effects at 450–550°C
The oxidation behaviour of two single crystal Ni-based superalloys has been investigated at 450°C and 550°C. Isothermal oxidation was carried out for varying times and it was found that exposure resulted in a sub-micrometre thick oxide. The external and internal oxide kinetics were studied via high-resolution image analysis and both showed sub-parabolic growth rates. Thermogravimetric tests indicated that the overall oxidation growth obeys a near quartic power law while parabolic kinetics can describe the transient oxidation period. Characterisation of the resulting oxides was carried out using electron microscopy, energy dispersive spectroscopy and X-ray diffraction. Results from thermodynamic modelling of the oxide formation are also presented to further assess the postulated mechanism of low-temperature oxidation in these Ni-based superalloys.
low temperature, Ni superalloy, Oxidation, single crystal, sub-parabolic kinetics
1-14
Evangelou, A.
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Soady, K.A.
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Lockyer, S.
bb75c766-1b6a-4115-b53c-39fbca4e1a07
Gao, N.
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Reed, P.A.S.
8b79d87f-3288-4167-bcfc-c1de4b93ce17
Evangelou, A.
840a9ab3-d2f9-4dee-9d5a-9f9c18c43be8
Soady, K.A.
2346cebf-29cb-45bf-943d-c65e3cf2986b
Lockyer, S.
bb75c766-1b6a-4115-b53c-39fbca4e1a07
Gao, N.
9c1370f7-f4a9-4109-8a3a-4089b3baec21
Reed, P.A.S.
8b79d87f-3288-4167-bcfc-c1de4b93ce17
Evangelou, A., Soady, K.A., Lockyer, S., Gao, N. and Reed, P.A.S.
(2018)
Oxidation behaviour of single crystal nickel-based superalloys: intermediate temperature effects at 450–550°C.
Materials Science and Technology (United Kingdom), .
(doi:10.1080/02670836.2018.1471436).
Abstract
The oxidation behaviour of two single crystal Ni-based superalloys has been investigated at 450°C and 550°C. Isothermal oxidation was carried out for varying times and it was found that exposure resulted in a sub-micrometre thick oxide. The external and internal oxide kinetics were studied via high-resolution image analysis and both showed sub-parabolic growth rates. Thermogravimetric tests indicated that the overall oxidation growth obeys a near quartic power law while parabolic kinetics can describe the transient oxidation period. Characterisation of the resulting oxides was carried out using electron microscopy, energy dispersive spectroscopy and X-ray diffraction. Results from thermodynamic modelling of the oxide formation are also presented to further assess the postulated mechanism of low-temperature oxidation in these Ni-based superalloys.
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Accepted/In Press date: 27 April 2018
e-pub ahead of print date: 16 May 2018
Keywords:
low temperature, Ni superalloy, Oxidation, single crystal, sub-parabolic kinetics
Identifiers
Local EPrints ID: 424857
URI: http://eprints.soton.ac.uk/id/eprint/424857
ISSN: 0267-0836
PURE UUID: 5a836e15-49b4-4ccc-85c6-27736ffa92fc
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Date deposited: 05 Oct 2018 11:50
Last modified: 06 Jun 2024 01:39
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Author:
A. Evangelou
Author:
K.A. Soady
Author:
S. Lockyer
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