Chromia layer growth on a Ni-based superalloy : sub-parabolic kinetics and the role of titanium

S. Cruchley; Hugh Evans; Mary Taylor; M. C. Hardy; S. Stekovic

doi:10.1016/j.corsci.2013.05.016

Chromia layer growth on a Ni-based superalloy : sub-parabolic kinetics and the role of titanium

S. Cruchley, Hugh Evans, Mary Taylor, M. C. Hardy, S. Stekovic

Metallurgy and Materials

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Abstract

Oxidation of the Ni-based superalloy RR1000 has been undertaken in air over the temperature range 600–900 °C for times up to 5000 h. The surface oxide consisted of a protective Ti-doped chromia layer but with rutile forming on its outer surface. Sub-surface oxidation of Al and Ti also occurred. The thickening kinetics of the chromia layer were sub-parabolic with initial rates around two orders of magnitude higher than expected for Ti-free chromia. This enhancement and the sub-parabolic kinetics are accounted for by Ti-doping of the chromia layer. Over time the enhancement reduced because of Ti-depletion in the alloy.

Original language	English
Pages (from-to)	58-66
Number of pages	9
Journal	Corrosion Science
Volume	75
Early online date	7 Jun 2013
DOIs	https://doi.org/10.1016/j.corsci.2013.05.016
Publication status	Published - Oct 2013

Keywords

A. Superalloys
C. Oxidation
C. Selective Oxidation

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10.1016/j.corsci.2013.05.016

Cruchley_et_al_Chromia_layer_growth_Corrosion_Science_2013
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http://linkinghub.elsevier.com/retrieve/pii/S0010938X13002187

Structural Metallic Systems For Advanced Gas Turbine Applications
Bowen, P., Chiu, Y. & Reed, R.
Engineering & Physical Science Research Council
1/10/09 → 30/09/14
Project: Research Councils

Cite this

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title = "Chromia layer growth on a Ni-based superalloy : sub-parabolic kinetics and the role of titanium",

abstract = "Oxidation of the Ni-based superalloy RR1000 has been undertaken in air over the temperature range 600–900 °C for times up to 5000 h. The surface oxide consisted of a protective Ti-doped chromia layer but with rutile forming on its outer surface. Sub-surface oxidation of Al and Ti also occurred. The thickening kinetics of the chromia layer were sub-parabolic with initial rates around two orders of magnitude higher than expected for Ti-free chromia. This enhancement and the sub-parabolic kinetics are accounted for by Ti-doping of the chromia layer. Over time the enhancement reduced because of Ti-depletion in the alloy.",

keywords = "A. Superalloys, C. Oxidation, C. Selective Oxidation",

author = "S. Cruchley and Hugh Evans and Mary Taylor and Hardy, {M. C.} and S. Stekovic",

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doi = "10.1016/j.corsci.2013.05.016",

language = "English",

volume = "75",

pages = "58--66",

journal = "Corrosion Science",

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T1 - Chromia layer growth on a Ni-based superalloy : sub-parabolic kinetics and the role of titanium

AU - Cruchley, S.

AU - Evans, Hugh

AU - Taylor, Mary

AU - Hardy, M. C.

AU - Stekovic, S.

PY - 2013/10

Y1 - 2013/10

N2 - Oxidation of the Ni-based superalloy RR1000 has been undertaken in air over the temperature range 600–900 °C for times up to 5000 h. The surface oxide consisted of a protective Ti-doped chromia layer but with rutile forming on its outer surface. Sub-surface oxidation of Al and Ti also occurred. The thickening kinetics of the chromia layer were sub-parabolic with initial rates around two orders of magnitude higher than expected for Ti-free chromia. This enhancement and the sub-parabolic kinetics are accounted for by Ti-doping of the chromia layer. Over time the enhancement reduced because of Ti-depletion in the alloy.

AB - Oxidation of the Ni-based superalloy RR1000 has been undertaken in air over the temperature range 600–900 °C for times up to 5000 h. The surface oxide consisted of a protective Ti-doped chromia layer but with rutile forming on its outer surface. Sub-surface oxidation of Al and Ti also occurred. The thickening kinetics of the chromia layer were sub-parabolic with initial rates around two orders of magnitude higher than expected for Ti-free chromia. This enhancement and the sub-parabolic kinetics are accounted for by Ti-doping of the chromia layer. Over time the enhancement reduced because of Ti-depletion in the alloy.

KW - A. Superalloys

KW - C. Oxidation

KW - C. Selective Oxidation

U2 - 10.1016/j.corsci.2013.05.016

DO - 10.1016/j.corsci.2013.05.016

M3 - Article

SN - 0010-938X

VL - 75

SP - 58

EP - 66

JO - Corrosion Science

JF - Corrosion Science

ER -

Chromia layer growth on a Ni-based superalloy : sub-parabolic kinetics and the role of titanium

Abstract

Keywords

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Structural Metallic Systems For Advanced Gas Turbine Applications

Cite this