Ni Base Alloy and Gas Turbine Blade and Gas Turbine Utilizing the Same

Abstract

An Ni base alloy uses GTD-111 as a base to improve high-temperature strength while maintaining the weldability and corrosion resistance and a gas turbine blade utilizes the Ni base alloy. The Ni base alloy contains Al of 2.5 to 3.5%, Co of 1.5 to 5.5%, Cr of 11.8 to 13.8%, Mo of 0.4 to 1.4%, Ta of 3.0 to 5.0%, Ti of 5.1 to 6.1%, W of 3.3 to 4.3%, B of 0.01 to 0.02%, C of 0.08 to 0.12% in mass % and remainder containing Ni and inevitable impurities and does not substantially contain Nb.

Description

BACKGROUND OF THE INVENTION[0001]The present invention relates to an Ni base alloy and a gas turbine blade utilizing the same and more particularly to the Ni base alloy having improved high-temperature strength while maintaining the weldablity and corrosion resistance and the gas turbine blade utilizing the same.[0002]With high efficiency of a gas turbine, a request for material capable of resisting more severe operation conditions is increased. Particularly, it is an important subject that the high-temperature strength is improved and harmful phase precipitation is suppressed while ensuring the weldability and corrosion resistance and material for a turbine having these properties is required.[0003]There is a nickel base alloy known generally as GTD-111 (U.S. Pat. No. 6,416,596). Casting material of GTD-111 includes nominal composition containing Cr of 14 mass %, Co of 10 mass %, Mo of 1.5 mass %, W of 3.8 mass %, Ta of 3 mass %, Al of 3 mass %, C of 0.10 mass %, Ti of 5 mass %, B ...

AI Technical Summary

Benefits of technology

The present invention provides a Ni base alloy usingGTD-111 as a base that has improved high-temperature strength while maintaining weldability and corrosion resistance. Additionally, a gas turbine blade utilizing this alloy is also provided.

Problems solved by technology

This alloy is excellent in the weldability and corrosion resistance, although the strength at higher temperature region is low and it is difficult to apply it to a high-efficient gas turbine.

However, the alloy is highly strengthened by addition of precipitation strengthening elements and solid solution strengthening elements, whereas the solid solution temperature of γ′-phase is high and there is a possibility that the weldability is not sufficient.

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