| 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 x [W (wt%)] + 24 x [Cr (wt%)] + 46 x[Mo (wt%)] - 18 x [Re (wt%)]. The Ni-based single crystal superalloy has excellent specific creep strength.
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