Microstructure of Long Time Aging in GH169 Alloys
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摘要: 對GH169合金長期時效的組織結構觀察表明,合金在650℃以下時效甚至長達5×104h,其組織變化并不明顯,保持了良好的組織穩定性。然而超過650℃,合金的組織對溫度極為敏感,發生了復雜的相轉變。通過對運行2.8×104h的渦輪盤榫齒的研究表明,應力加速誘發這種復雜的相變過程。
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關鍵詞:
- 高溫合金 /
- 時效 /
- δ相 /
- 沉淀硬化/GH160 /
- 長期時效
Abstract: Microstructure after long time aging have been observed by means of SEM in GH169 alloys. The results show that the microstructure almost no variation after long time aging up to 5×104h below 650℃, and reveals higher structure stability. However, microstructure is very sensitive to aging temperature beyond 650℃, and there existed complicated phase transformation. The experimental results also show that stress accelerates the complicated phase transformation by observing GH169 gas turbine disk with an engine service life of 2.8×104h-
Key words:
- superalloy /
- aging /
- δ-phase /
- precipitation hardening/GH169 /
- long time aging
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