Microstructural evolution and castability prediction in newly designed modern third-generation nickel-based superalloys

被引：0

作者：

Homam Naffakh-Moosavy ^{[1
]}

机构：

[1] Department of Materials Engineering, Faculty of Engineering, Tarbiat Modares University

来源：

International Journal of Minerals Metallurgy and Materials | 2016年 / 23卷 / 05期

关键词：

nickel-based superalloys; intermetallics; castability; microstructural evolution; chemical composition;

D O I：

暂无

中图分类号：

TG132.3 [特种热性质合金];

学科分类号：

080502 ;

摘要：

The present research aims to establish a quantitative relation between microstructure and chemical composition(i.e., Ti, Al, and Nb) of newly designed nickel-based superalloys. This research attempts to identify an optimum microstructure at which the minimum quantities of γ/γ′ and γ/γ″ compounds are achieved and the best castability is predicted. The results demonstrate that the highest quantity of intermetallic eutectics(i.e., 41.5wt%) is formed at 9.8wt%(Ti + Al). A significant quantity of intermetallics formed in superalloy 1(with a composition of γ- 9.8wt%(Ti + Al)), which can deteriorate its castability. The type and morphology of the eutectics changed and the amount considerably decreased with decreasing Ti + Al content in superalloy 2(with a composition of γ- 7.6wt%(Ti + Al), 1.5wt% Nb). Thus, it is predicted that the castability would improve for superalloy 2. The same trend was observed for superalloy 4(with a composition of γ- 3.7wt%(Ti + Al), 4.4wt% Nb). This means that the amount of Laves increases with increasing Nb(to 4.4wt%) and decreasing Ti + Al(to 3.7wt%) in superalloy 4. The best castability was predicted for superalloy 3(with a composition of γ- 5.7wt%(Ti + Al), 2.8wt% Nb).

引用

页码：548 / 562

页数：15

共 28 条

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