NI-BASE SINGLE CRYSTAL SUPERALLOY

摘要

Disclosed is an Ni-base single crystal superalloy having a composition composed of, in percentage by weight, not less than 5.0% by weight and not more than 7.0% by weight of Al, not less than 4.0% by weight and not more than 10.0% by weight of Ta, not less than 1.1% by weight and not more than 4.5% by weight of Mo, not less than 4.0% by weight and not more than 10.0% by weight of W, not less than 3.1% by weight and not more than 8.0% by weight of Re, not less than 0.0% by weight and not more than 2.0% by weight of Hf, not less than 2.5% by weight and not more than 8.5% by weight of Cr, not less than 0.0% by weight and not more than 9.9% by weight of Co, not less than 0.0% by weight and not more than 4.0% by weight of Nb, not less than 1.0% by weight and not more than 14.0% by weight of Ru, and the balance of Ni and unavoidable impurities. It is preferable that the composition ratio among Cr, Hf and Al is set so that the OP value is not less than 108. This Ni-base single crystal superalloy is improved in oxidation resistance, while maintaining high creep strength.