Effect of alloying on the oxidation behaviour of Co-Al-W superalloys

H. Y. Yan; V. A. Vorontsov; D. Dye

doi:10.1016/j.corsci.2014.03.002

Effect of alloying on the oxidation behaviour of Co-Al-W superalloys

H. Y. Yan, V. A. Vorontsov, D. Dye

Design, Manufacturing And Engineering Management

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108 Citations (Scopus)

Abstract

The 800°C isothermal and cyclic oxidation of alloys based on Co-7Al-7W (at.%) was examined. Cr, Fe and Si additions were beneficial. Repeated oxide bilayers formed during cycling of non-Cr alloys, which were not protective (>100μm thick). In these layers, the outer was Co₃O₄ and the inner, a porous Co₃O₄ and Al₂O₃ mixture. 10at.% Cr substitution for Co was sufficient to produce a protective, ~1μm thick scale which contained an outer layer of Al₂CoO₄, a very thin (100nm) middle layer of Cr₂O₃ and an inner layer of Al₂O₃. Therefore protective oxide scales are possible in γ/γ^', Co-Co₃(Al,W) superalloys.

Original language	English
Pages (from-to)	382-395
Number of pages	14
Journal	Corrosion Science
Volume	83
DOIs	https://doi.org/10.1016/j.corsci.2014.03.002
Publication status	Published - 1 Jan 2014

Keywords

superalloys
STEM
thermal cycling
oxidation
oxidation behaviour
Co–Al–W superalloys

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10.1016/j.corsci.2014.03.002

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title = "Effect of alloying on the oxidation behaviour of Co-Al-W superalloys",

abstract = "The 800°C isothermal and cyclic oxidation of alloys based on Co-7Al-7W (at.%) was examined. Cr, Fe and Si additions were beneficial. Repeated oxide bilayers formed during cycling of non-Cr alloys, which were not protective (>100μm thick). In these layers, the outer was Co3O4 and the inner, a porous Co3O4 and Al2O3 mixture. 10at.% Cr substitution for Co was sufficient to produce a protective, ~1μm thick scale which contained an outer layer of Al2CoO4, a very thin (100nm) middle layer of Cr2O3 and an inner layer of Al2O3. Therefore protective oxide scales are possible in γ/γ', Co-Co3(Al,W) superalloys.",

keywords = "superalloys, STEM, thermal cycling, oxidation, oxidation behaviour, Co–Al–W superalloys",

author = "Yan, {H. Y.} and Vorontsov, {V. A.} and D. Dye",

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doi = "10.1016/j.corsci.2014.03.002",

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TY - JOUR

T1 - Effect of alloying on the oxidation behaviour of Co-Al-W superalloys

AU - Yan, H. Y.

AU - Vorontsov, V. A.

AU - Dye, D.

PY - 2014/1/1

Y1 - 2014/1/1

N2 - The 800°C isothermal and cyclic oxidation of alloys based on Co-7Al-7W (at.%) was examined. Cr, Fe and Si additions were beneficial. Repeated oxide bilayers formed during cycling of non-Cr alloys, which were not protective (>100μm thick). In these layers, the outer was Co3O4 and the inner, a porous Co3O4 and Al2O3 mixture. 10at.% Cr substitution for Co was sufficient to produce a protective, ~1μm thick scale which contained an outer layer of Al2CoO4, a very thin (100nm) middle layer of Cr2O3 and an inner layer of Al2O3. Therefore protective oxide scales are possible in γ/γ', Co-Co3(Al,W) superalloys.

AB - The 800°C isothermal and cyclic oxidation of alloys based on Co-7Al-7W (at.%) was examined. Cr, Fe and Si additions were beneficial. Repeated oxide bilayers formed during cycling of non-Cr alloys, which were not protective (>100μm thick). In these layers, the outer was Co3O4 and the inner, a porous Co3O4 and Al2O3 mixture. 10at.% Cr substitution for Co was sufficient to produce a protective, ~1μm thick scale which contained an outer layer of Al2CoO4, a very thin (100nm) middle layer of Cr2O3 and an inner layer of Al2O3. Therefore protective oxide scales are possible in γ/γ', Co-Co3(Al,W) superalloys.

KW - superalloys

KW - STEM

KW - thermal cycling

KW - oxidation

KW - oxidation behaviour

KW - Co–Al–W superalloys

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U2 - 10.1016/j.corsci.2014.03.002

DO - 10.1016/j.corsci.2014.03.002

M3 - Article

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SN - 0010-938X

VL - 83

SP - 382

EP - 395

JO - Corrosion Science

JF - Corrosion Science

ER -

Effect of alloying on the oxidation behaviour of Co-Al-W superalloys

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Vassili Vorontsov

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Effect of alloying on the oxidation behaviour of Co-Al-W superalloys

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Vassili Vorontsov

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