| 摘要 |
A Ni-based single crystal superalloy which has the following composition: Co: 0.0 wt % or more to 15.0 wt % or less, Cr: 4.1 to 8.0 wt %, Mo: 2.1 to 6.5 wt %, W: 0.0 to 3.9 wt %, Ta: 4.0 to 10.0 wt %, Al: 4.5 to 6.5 wt %, Ti: 0.0 to 1.0 wt %, Hf: 0.00 to 0.5 wt %, Nb: 0.0 to 3.0 wt %, Re: 3.0 to 8.0 wt % and Ru: 0.5 to 6.5 wt % with the remainder including Ni and unavoidable impurities, wherein P1≰700 is satisfied in which P1 represents a parameter 1, which is obtained by a formula: P1=137×[W (wt %)]+24×[Cr (wt %)]+46×[Mo (wt %)]−18×[Re (wt %)]. The Ni-based single crystal superalloy has excellent specific creep strength.
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