The Effect of Elevated Air Pressure on the Oxidation Properties of the Nickel-based Superalloy, RR1000, at 650°C with Different Surface Modifications

Mary Taylor; Hugh Evans; Thomas Reynolds; Dan Child

doi:10.1080/09603409.2017.1389132

The Effect of Elevated Air Pressure on the Oxidation Properties of the Nickel-based Superalloy, RR1000, at 650°C with Different Surface Modifications

Mary Taylor, Hugh Evans, Thomas Reynolds, Dan Child

Metallurgy and Materials

Research output: Contribution to journal › Article › peer-review

3 Citations (Scopus)

206 Downloads (Pure)

Abstract

Samples of RR1000 with differing grain size and surface finish have been exposed to air at different pressures. Specimens were exposed for 4000 hours at 650°C with some exposed to atmospheric pressure air and some exposed to air at 40 bar pressure. Samples exposed to elevated pressure formed a surface layer of NiCr2O4 whereas that formed on samples tested at 1 bar pressure was chromia. The surface layer formed at 40 bar pressure was thinner than that a 1 bar pressure. At 1 bar pressure, some samples exhibited regions of convoluted buckled oxides but no spallation. In adjacent regions of planar oxides, spallation did occur. For the latter case, an estimate of 6 Jm-2 for the interfacial fracture energy has been made. None of the specimens tested at 40 bar pressure exhibited oxide spallation.

Original language	English
Pages (from-to)	130-140
Journal	Materials at High Temperatures
Volume	35
Issue number	1-3
Early online date	17 Oct 2017
DOIs	https://doi.org/10.1080/09603409.2017.1389132
Publication status	Published - 1 Mar 2018

Keywords

Oxidation
Pressure
Chromia former
Superalloy
Spinel
XRD

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10.1080/09603409.2017.1389132Licence: None: All rights reserved

The Effect of Elevated Air Pressure on the Oxidation Properties of the Nickel-based Superalloy, RR1000, at 650°C with Different Surface Modifications.
This is an Accepted Manuscript of an article published by Taylor & Francis in Materials at High Temperatures on 17/10/2017, available online: http://www.tandfonline.com/10.1080/09603409.2017.1389132.
Accepted author manuscript, 9.64 MBLicence: Other (please specify with Rights Statement)

Cite this

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title = "The Effect of Elevated Air Pressure on the Oxidation Properties of the Nickel-based Superalloy, RR1000, at 650°C with Different Surface Modifications",

abstract = "Samples of RR1000 with differing grain size and surface finish have been exposed to air at different pressures. Specimens were exposed for 4000 hours at 650°C with some exposed to atmospheric pressure air and some exposed to air at 40 bar pressure. Samples exposed to elevated pressure formed a surface layer of NiCr2O4 whereas that formed on samples tested at 1 bar pressure was chromia. The surface layer formed at 40 bar pressure was thinner than that a 1 bar pressure. At 1 bar pressure, some samples exhibited regions of convoluted buckled oxides but no spallation. In adjacent regions of planar oxides, spallation did occur. For the latter case, an estimate of 6 Jm-2 for the interfacial fracture energy has been made. None of the specimens tested at 40 bar pressure exhibited oxide spallation.",

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author = "Mary Taylor and Hugh Evans and Thomas Reynolds and Dan Child",

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AU - Reynolds, Thomas

AU - Child, Dan

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N2 - Samples of RR1000 with differing grain size and surface finish have been exposed to air at different pressures. Specimens were exposed for 4000 hours at 650°C with some exposed to atmospheric pressure air and some exposed to air at 40 bar pressure. Samples exposed to elevated pressure formed a surface layer of NiCr2O4 whereas that formed on samples tested at 1 bar pressure was chromia. The surface layer formed at 40 bar pressure was thinner than that a 1 bar pressure. At 1 bar pressure, some samples exhibited regions of convoluted buckled oxides but no spallation. In adjacent regions of planar oxides, spallation did occur. For the latter case, an estimate of 6 Jm-2 for the interfacial fracture energy has been made. None of the specimens tested at 40 bar pressure exhibited oxide spallation.

AB - Samples of RR1000 with differing grain size and surface finish have been exposed to air at different pressures. Specimens were exposed for 4000 hours at 650°C with some exposed to atmospheric pressure air and some exposed to air at 40 bar pressure. Samples exposed to elevated pressure formed a surface layer of NiCr2O4 whereas that formed on samples tested at 1 bar pressure was chromia. The surface layer formed at 40 bar pressure was thinner than that a 1 bar pressure. At 1 bar pressure, some samples exhibited regions of convoluted buckled oxides but no spallation. In adjacent regions of planar oxides, spallation did occur. For the latter case, an estimate of 6 Jm-2 for the interfacial fracture energy has been made. None of the specimens tested at 40 bar pressure exhibited oxide spallation.

KW - Oxidation

KW - Pressure

KW - Chromia former

KW - Superalloy

KW - Spinel

KW - XRD

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DO - 10.1080/09603409.2017.1389132

M3 - Article

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VL - 35

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ER -

The Effect of Elevated Air Pressure on the Oxidation Properties of the Nickel-based Superalloy, RR1000, at 650°C with Different Surface Modifications

Abstract

Keywords

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