Effect of long-term service exposure on microstructure and mechanical properties of Alloy 617

► The major microstructural degradation is grain boundary M 23C 6 carbides formation. ► The major mechanical properties degradation is decreasing in ductility of the alloy. ► Formation of continuous carbides along GBs reduced the rupture life of the alloy. The present work was carried out to investi...

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Bibliographic Details
Published in:Materials in engineering 2011-05, Vol.32 (5), p.2695-2700
Main Authors: Akbari-Garakani, Mohammad, Mehdizadeh, Mohsen
Format: Article
Language:English
Subjects:
Carbides
Degradation
Ductility
E. Mechanical
Exposure
F. Microstructure
G. Metallography
Grain boundaries
Mechanical properties
Microstructure
Nickel base alloys
Superalloys
Yield strength
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Summary:► The major microstructural degradation is grain boundary M 23C 6 carbides formation. ► The major mechanical properties degradation is decreasing in ductility of the alloy. ► Formation of continuous carbides along GBs reduced the rupture life of the alloy. The present work was carried out to investigate the effect of long-term service exposure on microstructure and mechanical properties of a gas turbine hot gas path component, made of Alloy 617. The results showed significant service-induced microstructural changes, such as excessive grain boundary Cr-rich M 23C 6 carbides formation and some oxidation features in the exposed material in compare with the solution-annealed material. Also it was found that the yield strength and hardness of the alloy have increased while the ductility of the alloy has decreased. In the similar test conditions, the stress-rupture life of the exposed alloy decreased considerably compared to the solution-annealed sample, which could be attributed to the microstructural degradation, especially formation of continuous M 23C 6 carbides on grain boundaries.
ISSN:0261-3069
DOI:10.1016/j.matdes.2011.01.017