EFFECTS OF AL ON MICROSTRUCTURE AND STABILITY OF GH4169 ALLOY

Acta Metall Sin

2008, Vol. 44

Issue (7): 791-798 DOI:

Research Articles

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EFFECTS OF AL ON MICROSTRUCTURE AND STABILITY OF GH4169 ALLOY

金属研究所

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. EFFECTS OF AL ON MICROSTRUCTURE AND STABILITY OF GH4169 ALLOY. Acta Metall Sin, 2008, 44(7): 791-798 .

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Abstract ABSTRACT The effects of Al on the microstructure and stability of GH4169 alloy were studied in this article. When the Al contents were in the standard range required by GH4169 alloy, γ″ and γ′ phase were precipitated separately in the grain, and δ phase was precipitated as the principle precipitate in the grain boundaries. γ″/γ′ “compact morphology” was formed in the grain, δ phase was decreased greatly in the grain boundaries accompanying with a large amount of Laves phase, a small amount of M7C3 carbide and σ phase precipitating there with the increment of Al content, specially above 1.24% (mass.). After long- term aging at 680℃ up to 1000h, γ″/γ′ “compact morphology” grew slowly in the alloys with high Al contents, whereas the amount of the phases precipitating in the grain boundaries was increased, whose sizes were coarsened, and α-Cr phase was formed in this condition. This trend was more obvious with increasing Al contents.

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Received: 06 December 2007

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