Ni-Base Single Crystal Superalloy with Enhanced Creep Property

Abstract

The present invention provides Ni-base single crystal superalloy with good high-temperature property, particularly long creep life and excellent resistance to creep deformation, by adjusting content of Al and Ti that form a gamma prime (γ′), a major hardening phase of the Ni-base single crystal superalloy. The Ni-base single crystal superalloy comprise Co: 11.5˜13.5%, Cr: 3.0˜5.0%, Mo: 0.7˜2.0%, W: 8.5˜10.5%, Al: 3.5˜5.5%, Ti: 2.5˜4.5%, Ta: 6.0˜8.0%, Re: 2.0˜4.0%, Ru: 0.1˜2.0% in Weight %, and the rest is Ni and other inevitable impurities. And composition ratio of Al/Ti is 0.7˜2.2. In addition, the superalloy has a mixed structure of the γ matrix and γ′ particles.

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