INFLUENCE OF Ti/Al RATIOS ON γ′ COARSENING BEHAVIOR AND MECHANICAL PROPERTIES OF GH984G DURING LONG-TERM AGING

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Abstract

In this research, the coarsening behavior of γ′ precipitates and the effects of Ti/Al ratios to tensile properties after long-term aging in GH984G were investigated. It was suggested that the coarsening of sphere γ′ precipitates growed faster with the aging temperature increased from 700℃ to 800℃. The growth kinetics of the γ′ precipitates were explained by Lifshitz-Slyozov-Wagner’s theory of element diffusion controlled growth at 700℃ and 750℃ during long-term aging. However, the coarsening of γ′ precipitates at 800℃ was contrary to Lifshitz-Slyozov-Wagner’s theory. The γ′ precipitates with high Ti/Al growed fast as the aging time less than 3000h, whereas it slowed down as aging time prolonged. Moreover, the coarsening of γ′ precipitates was fast at 800℃, whereas it slowed down as the aging temperature decreased to 700℃. Ti/Al had no effect on the alloy of standard heat treatment and 700 ℃ tensile properties after long time aging. Therefore, the γ′ precipitates of GH984G alloy possessed excellent stability of microstructure at 700℃, and it could control the γ′ precipitates growth further by adjusting Ti/Al ratio.

Received: 24 March 2014

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. INFLUENCE OF Ti/Al RATIOS ON γ′ COARSENING BEHAVIOR AND MECHANICAL PROPERTIES OF GH984G DURING LONG-TERM AGING. Acta Metall Sin, 0, 0(0): 0-0.

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https://www.ams.org.cn/EN/ OR https://www.ams.org.cn/EN/Y0/V0/I0/0

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