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Investigations on servicing damage mechanisms of Cr35Ni45Nb alloy under complex conditions

Published online by Cambridge University Press:  10 May 2016

Jiangchu Xiao  and
Maicang Zhang
Jiangchu Xiao*
Affiliation:
School of Material science and engineering, University of Science & Technology Beijing, Beijing 100083, China
Maicang Zhang*
Affiliation:
School of Material science and engineering, University of Science & Technology Beijing, Beijing 100083, China
*
b) e-mail: [email protected]
a) Address all correspondence to these authors. e-mail: [email protected]
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Abstract

The damage induced by oxidation and stress during the service process of Cr35Ni45Nb alloy and their influences on the microstructure evolution and creep rupture life of this alloy were studied. Continuity, compactness, and high temperature stability of the oxide layers are conductive to the performance of the alloy. A slight but complete layer of oxidation on surface improves the creep rupture life of the specimens. However, being exposed to long-term oxidation is observed to be counter-productive. Temperature stress generated during the air-cooling process creates large carbides near the surface of the specimen's cracks. Moreover, tiny carbides are precipitated from γ matrix and interfacial defects due to creep stress, but strip carbides are dissolved due to creep stress and the Gibbs–Thomson effect.

Keywords

heat-resisting alloyerosionservice damage
Type
Articles
Information
Journal of Materials Research , Volume 31 , Issue 14 , 28 July 2016 , pp. 2156 - 2163
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Copyright
Copyright © Materials Research Society 2016 

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Footnotes

Contributing Editor: Jürgen Eckert

References

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