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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
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
0267-0836
1-14
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.
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), 1-14. (doi:10.1080/02670836.2018.1471436).

Record type: Article

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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More information

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
ORCID for N. Gao: ORCID iD orcid.org/0000-0002-7430-0319
ORCID for P.A.S. Reed: ORCID iD orcid.org/0000-0002-2258-0347

Catalogue record

Date deposited: 05 Oct 2018 11:50
Last modified: 16 Mar 2024 03:21

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Contributors

Author: A. Evangelou
Author: K.A. Soady
Author: S. Lockyer
Author: N. Gao ORCID iD
Author: P.A.S. Reed ORCID iD

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