Uncovering the high-temperature microstructural evolution and creep-fatigue damage mechanism of CMSX-4 brazed joints

Chuanyang Lu,Zhulai Qin,Shiyang Wang,Yanming He,Yuan Sun,Zengliang Gao,Shan-Tung Tu

International Journal of Fatigue（2023）

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摘要

•Zone I of CMSX-4 brazed joint without aging consists of γ + γ′, borides and silicides.•Boride and silicide in Zone I show opposite microstructural trends with aging time.•Second hardening peak occurs prior to the creep-fatigue fracture of brazed joint.•Creep void and fatigue crack are apt to initiate from matrix/precipitate interfaces.

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关键词

Nickel-based single-crystal superalloy,Brazing,Creep-fatigue,Microstructural evolution,Damage mechanism

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