Effects of high gravity on the nucleation and precipitation of δ phase of GH4169 alloy

Abstract

Using a cantilever high-temperature ultracentrifuge to simulate working conditions of engine turbine disk, this study systematically investigates the microstructural evolution of GH4169 superalloy under 50,000 g high gravity condition at 720 °C, 800 °C and 850 °C for 24 h, focusing on the nucleation and precipitation of δ phase. The results reveal that the alloy exhibits moderate suppression of nucleation and precipitation of δ phase under high gravity. The changes in the coarsening of γʹʹ phase makes δ phase lose its nucleation site and can't precipitate through the transformation from γʹʹ to δ phase. This research offers new insights and empirical support for superalloy applications and optimization under extreme conditions.