Effect of Al content on the high-temperature oxidation of Co-20Cr-(5, 10)Al oxide dispersion strengthened superalloys

Hao Yu; Shigeharu Ukai; Shigenari Hayashi; Naoko Oono

doi:10.1016/j.corsci.2017.01.015

Effect of Al content on the high-temperature oxidation of Co-20Cr-(5, 10)Al oxide dispersion strengthened superalloys

Hao Yu, Shigeharu Ukai, Shigenari Hayashi, Naoko Oono

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

13 Citations (Scopus)

Abstract

The high-temperature oxidation of Co-based oxide dispersion strengthened (ODS) Co-20Cr-(5, 10) Al-2.4Hf-1.5Y₂O₃ (wt%) superalloys was investigated at 900 °C and 1000 °C. The 10Al (wt%) superalloys possess better oxidation resistance with the formation of alumina scale than the 5Al (wt%) with a duplex scale of CoCr₂O₄/Cr₂O₃ and internal Al₂O₃. The alumina on the 10Al superalloy is composed of θ- and α-alumina at 900 °C but dominated by α-alumina at 1000 °C. The lower weight gain of 10Al superalloys at 1000 °C than at 900 °C was associated with different growth mechanisms of the Al₂O₃ scales.

Original language	English
Pages (from-to)	49-59
Number of pages	11
Journal	Corrosion Science
Volume	118
DOIs	https://doi.org/10.1016/j.corsci.2017.01.015
Publication status	Published - 2017 Apr 1
Externally published	Yes

Keywords

A. Alumina
A. Cobalt
B. SEM
C. Oxidation

ASJC Scopus subject areas

Chemistry(all)
Chemical Engineering(all)
Materials Science(all)

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10.1016/j.corsci.2017.01.015

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@article{48ba870978bd45739a03d8e67ee1380d,

title = "Effect of Al content on the high-temperature oxidation of Co-20Cr-(5, 10)Al oxide dispersion strengthened superalloys",

abstract = "The high-temperature oxidation of Co-based oxide dispersion strengthened (ODS) Co-20Cr-(5, 10) Al-2.4Hf-1.5Y2O3 (wt%) superalloys was investigated at 900 °C and 1000 °C. The 10Al (wt%) superalloys possess better oxidation resistance with the formation of alumina scale than the 5Al (wt%) with a duplex scale of CoCr2O4/Cr2O3 and internal Al2O3. The alumina on the 10Al superalloy is composed of θ- and α-alumina at 900 °C but dominated by α-alumina at 1000 °C. The lower weight gain of 10Al superalloys at 1000 °C than at 900 °C was associated with different growth mechanisms of the Al2O3 scales.",

keywords = "A. Alumina, A. Cobalt, B. SEM, C. Oxidation",

author = "Hao Yu and Shigeharu Ukai and Shigenari Hayashi and Naoko Oono",

note = "Funding Information: This work is supported by Grant-in-Aid for Scientific Research (B), 24360282, Japan Society for the Promotion of Science (JSPS). H. Yu is grateful to the China Scholarship Council (CSC) for the provision of a scholarship. The analysis of EPMA was carried out with ?JEOL JXA-8530F? at the ?Joint-use Facilities: Laboratory of Nano-Micro Material Analysis?, Hokkaido University. Publisher Copyright: {\textcopyright} 2017 Elsevier Ltd",

year = "2017",

month = apr,

day = "1",

doi = "10.1016/j.corsci.2017.01.015",

language = "English",

volume = "118",

pages = "49--59",

journal = "Corrosion Science",

issn = "0010-938X",

publisher = "Elsevier Limited",

}

TY - JOUR

T1 - Effect of Al content on the high-temperature oxidation of Co-20Cr-(5, 10)Al oxide dispersion strengthened superalloys

AU - Yu, Hao

AU - Ukai, Shigeharu

AU - Hayashi, Shigenari

AU - Oono, Naoko

N1 - Funding Information: This work is supported by Grant-in-Aid for Scientific Research (B), 24360282, Japan Society for the Promotion of Science (JSPS). H. Yu is grateful to the China Scholarship Council (CSC) for the provision of a scholarship. The analysis of EPMA was carried out with ?JEOL JXA-8530F? at the ?Joint-use Facilities: Laboratory of Nano-Micro Material Analysis?, Hokkaido University. Publisher Copyright: © 2017 Elsevier Ltd

PY - 2017/4/1

Y1 - 2017/4/1

N2 - The high-temperature oxidation of Co-based oxide dispersion strengthened (ODS) Co-20Cr-(5, 10) Al-2.4Hf-1.5Y2O3 (wt%) superalloys was investigated at 900 °C and 1000 °C. The 10Al (wt%) superalloys possess better oxidation resistance with the formation of alumina scale than the 5Al (wt%) with a duplex scale of CoCr2O4/Cr2O3 and internal Al2O3. The alumina on the 10Al superalloy is composed of θ- and α-alumina at 900 °C but dominated by α-alumina at 1000 °C. The lower weight gain of 10Al superalloys at 1000 °C than at 900 °C was associated with different growth mechanisms of the Al2O3 scales.

AB - The high-temperature oxidation of Co-based oxide dispersion strengthened (ODS) Co-20Cr-(5, 10) Al-2.4Hf-1.5Y2O3 (wt%) superalloys was investigated at 900 °C and 1000 °C. The 10Al (wt%) superalloys possess better oxidation resistance with the formation of alumina scale than the 5Al (wt%) with a duplex scale of CoCr2O4/Cr2O3 and internal Al2O3. The alumina on the 10Al superalloy is composed of θ- and α-alumina at 900 °C but dominated by α-alumina at 1000 °C. The lower weight gain of 10Al superalloys at 1000 °C than at 900 °C was associated with different growth mechanisms of the Al2O3 scales.

KW - A. Alumina

KW - A. Cobalt

KW - B. SEM

KW - C. Oxidation

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U2 - 10.1016/j.corsci.2017.01.015

DO - 10.1016/j.corsci.2017.01.015

M3 - Article

AN - SCOPUS:85011397669

VL - 118

SP - 49

EP - 59

JO - Corrosion Science

JF - Corrosion Science

SN - 0010-938X

ER -

Effect of Al content on the high-temperature oxidation of Co-20Cr-(5, 10)Al oxide dispersion strengthened superalloys

Abstract

Keywords

ASJC Scopus subject areas

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