Abstract
The microstructure evolution and stress rupture properties at 1100°C/140MPa of a Ru-containing single crystal superalloy after long term aging at 1100°C for 200h-1000h were investigated. The results showed that the γ′ phase rafting and the γ matrix channel broadening appeared after long term aging. The rafting degree enhanced with increasing of aging time. A small amount of TCP phase began to appear after aging for 200h. The volume fraction of TCP phase after aging for 1000h was only 0.1%, which indicated the alloy had excellent microstructure stability. The stress rupture life of the alloy at 1100°C/140MPa represented the decrease tendency with increasing of aging time. The γ′ rafting and TCP phase precipitation were the main factor for this degradation.
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