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Research on the oxidation behavior of novel γ/γ′-strengthened Co–9Al–10W alloys combined with chromium and rare earth elements

Published online by Cambridge University Press:  11 October 2016

Qiong Wang ,
Qiang Yao ,
Yan Wang ,
Yu-Hong Zhu  and
Tong Lu
Qiong Wang
Affiliation:
National Supervising & Testing Center for Engineering Composite Materials' Quality, Jiangsu Provincial Supervising & Testing Research Institute for Products' Quality, Nanjing 210007, People's Republic of China
Qiang Yao*
Affiliation:
National Supervising & Testing Center for Engineering Composite Materials' Quality, Jiangsu Provincial Supervising & Testing Research Institute for Products' Quality, Nanjing 210007, People's Republic of China
Yan Wang
Affiliation:
National Supervising & Testing Center for Engineering Composite Materials' Quality, Jiangsu Provincial Supervising & Testing Research Institute for Products' Quality, Nanjing 210007, People's Republic of China
Yu-Hong Zhu
Affiliation:
National Supervising & Testing Center for Engineering Composite Materials' Quality, Jiangsu Provincial Supervising & Testing Research Institute for Products' Quality, Nanjing 210007, People's Republic of China
Tong Lu
Affiliation:
National Supervising & Testing Center for Engineering Composite Materials' Quality, Jiangsu Provincial Supervising & Testing Research Institute for Products' Quality, Nanjing 210007, People's Republic of China
*
a) Address all correspondence to this author. e-mail: [email protected]
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Abstract

The isothermal oxidation experiments were carried out on several new γ/γ′-strengthened cobalt-base alloys Co–Al–W–4Cr–0.02X (X = La, Ce, Dy, Y) at 900 and 800 °C. Due to an appropriate content of additional elements, the change in the morphology occurred and it significantly improved the oxidation resistance compared with those without Cr, among which the one with La elements shows the best oxidation resistance. Multiple oxide layers are also formed during the oxidation process, with CoWO4 and CoAl2O4 phases in the outer layer, and Cr, Al, W, and Co (e.g., Cr2O3) in the middle layer. The inner layer consists of some Al2O3 oxides, while more protective Al2O3 oxide was formed, esp. at the temperature of 800 °C. Both Cr2O3 and Al2O3 oxides were effectively protective oxides, which can prevent the intrusion of oxygen into the alloy substrate. Moreover, a phase transformation (γ/γ′ to γ/Co3W) was observed at the interface between oxide layer and substrate.

Keywords

cobalt-base alloychromiumrare earth elementoxidation
Type
Articles
Information
Journal of Materials Research , Volume 31 , Issue 21 , 14 November 2016 , pp. 3332 - 3344
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Copyright
Copyright © Materials Research Society 2016 

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Footnotes

Contributing Editor: Jürgen Eckert

References

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