Nickel-base superalloys and components formed thereof

Abstract

The invention relates to a gamma' prime nickel-base superalloy and components formed therefrom. The alloy contains, by weight, 11.3 to 13.3% cobalt, 12.4 to 15.2% chromium, 2.1 to 2.7% aluminum, 3.6 to 5.8% titanium, 3.5 to 4.5% tungsten, 3.1 to 3.8% molybdenum, 0.0 to 1.2% niobium, 0.0 to 2.3% tantalum, 0.0 to 0.5% hafnium, 0.040 to 0.100% carbon, 0.010 to 0.046% boron, 0.030 to 0.080% zirconium, the balance nickel and impurities, wherein the Nb+Ta content is 0.0-3.5%.

Description

technical field [0001] In general, the present invention relates to nickel-based alloy compositions, and more particularly, to nickel-based superalloys suitable for use in components requiring polycrystalline microstructures and high temperature load holding capabilities, such as turbine disks for gas turbines. Background technique [0002] The turbine section of a gas turbine is located downstream of the combustor section and contains a rotor shaft and one or more turbine stages, each turbine stage having a turbine disk (rotor) mounted on or otherwise driven by the shaft and a rotor mounted to the disk. Turbine blades at the periphery and extending radially from the periphery of the disk. To achieve acceptable mechanical properties at the high temperatures generated by the hot combustion gases, components within the combustor and turbine sections are often formed from superalloy materials. Higher compressor outlet temperatures in modern high pressure ratio gas turbines als...

AI Technical Summary

Problems solved by technology

However, complicating this challenge is the fact that creep and crack growth properties are difficult to improve simultaneously and can be significantly influenced by relatively small changes in the presence or absence of certain alloying constituents and the amount of alloying constituents present in superalloys influences

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