Abstract
Microstructural evolution of a nickel-base single crystal superalloy during thermal exposure at 900 and 1000 °C was investigated. In addition to growing and linking of γ′ particles, carbides M 6C and M 23C 6 precipitated in this testing alloy. During exposure at 900 °C, M 6C carbide precipitated in cubic shape, while at 1000 °C, M 6C carbide was separated out in needle-like or cubic shape. M 23C 6 carbide was all precipitated in the γ matrix channel. The TCP phase was not found in this alloy during thermal exposure both at 900 and 1000 °C before 1500 h.
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