Abnormal increase of TCP phase during heat treatment in a Ni-based single crystal superalloy

Generally, elevated solution heat treatment temperature decreases the residual dendritic segregation of refractory elements (i.e. Re and W) and suppresses the precipitation of deleterious topologically close-packed (TCP) phases in Ni-based superalloys. However, in the present study, elevated solutio...

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Bibliographic Details
Published in:Scripta materialia 2019-12, Vol.173, p.1-4
Main Authors: Yin, Bin, Xie, Guang, Lou, Langhong, Zhang, Jian
Format: Article
Language:English
Subjects:
Heat treatment
Segregation
Single crystal superalloy
Supersaturation
TCP phases
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Summary:Generally, elevated solution heat treatment temperature decreases the residual dendritic segregation of refractory elements (i.e. Re and W) and suppresses the precipitation of deleterious topologically close-packed (TCP) phases in Ni-based superalloys. However, in the present study, elevated solution temperature resulted in an abnormal increase of TCP phases in a Ni-based single crystal superalloy after long-term thermal exposure at 900 °C. Microstructural analysis suggested that higher supersaturation in γ phase which promoted the formation of TCP phases was induced by the increased γ′ precipitation after heat treated at elevated solution temperature. [Display omitted]
ISSN:1359-6462
1872-8456
DOI:10.1016/j.scriptamat.2019.07.027