Influence of initial microstructure on the γ′-coarsening behavior in a corrosion-resistant Ni-based superalloy

To clarify the initial microstructure dependent γ′-coarsening behavior, a corrosion-resistant Ni-based superalloy with the varied γ′-size were prepared by changing the primary aging heat treatment temperature. The microstructural evolution was investigated during long term thermal exposure (up to 30...

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Bibliographic Details
Published in:Intermetallics 2024-09, Vol.172, p.108396, Article 108396
Main Authors: Gong, Xiufang, Liu, Gang, Gao, Zhenhuan, Li, Shikun, Nie, Liping, Luo, Chao, Sun, Liyang, Zou, Juntao
Format: Article
Language:English
Subjects:
Coarsening kinetics
Heat treatment
Ni-based superalloy
γ′-precipitates
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Summary:To clarify the initial microstructure dependent γ′-coarsening behavior, a corrosion-resistant Ni-based superalloy with the varied γ′-size were prepared by changing the primary aging heat treatment temperature. The microstructural evolution was investigated during long term thermal exposure (up to 3000 h) at 900 °C and 1000 °C, respectively. It was found that Cr, Co, and Mo preferentially partition to γ-matrix, while Ta, Ti, Al, Ni, and W partition to the γ′-phase. The abnormal partition of W to the γ′-phase can be attributed to the low content of Ta in CM247 LC alloy. Furthermore, the γ′-coarsening behavior can be divided into two stages. During the early stage of coarsening (
ISSN:0966-9795
1879-0216
DOI:10.1016/j.intermet.2024.108396