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he fu he xi chu qiang hua xin xing nie ji gao wen he jin de yan jiu
Pages: 39-48
Year: Issue:  3
Journal: Transactions of Materials and Heat Treatment

Keyword:  superalloystructure stabilityγ″γ′ precipitate strengthening;
Abstract: A peculiar form of combined precipitates of γ″ and γ′ is developed by modifying the main strengthening elements of Nb,Ti and Al in order to increase high thermal structure stability to be used beyond the ceiling temperature of 650℃. Detail TEM and mechanical property studies have shown that not only thermal structure stability was improved since the coarsening rate of γ″ in modified alloy 718 was decreased and the phase transformation of γ″→δ was delayed, but also the mechanical properites, such as tensile properties,stress rupture life and creep properties were superior than conventional IN 718. The modification of main strengthening elements has been suggested as follows:Nb:50%~53%(mass fraction); Nb+Ti+Al:65%~75%(atom fraction); (Al+Ti)/Nb:11~14 in atomic ratio.
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