| 摘要 |
PURPOSE: Castable and weldable nickel-base alloys exhibiting desirable properties suitable for gas turbine engine applications are provided. CONSTITUTION: The castable weldable nickel-base alloy consists of, by weight, 10% to 25% cobalt, 20% to 28% chromium, 1% to 3% tungsten, 0.5% to 1.5% aluminum, 1.5% to 2.8% titanium, 0.8% to 1.45% columbium, tantalum having an amount less than the amount of columbium and satisfying the relational expression: Cb+0.508Ta is 1.15% to 1.45%, 0.001% to 0.025% boron, up to 0.4% zirconium, 0.02% to 0.15% carbon, with the balance being essentially nickel and incidental impurities, wherein the columbium content is at least 1.25%, wherein the tantalum content is 0.01% to 0.09%, wherein the alloy is essentially free of tantalum, wherein the cobalt content is 18.5% to 19.5%, the chromium content is 22.2% to 22.8%, the tungsten content is 1.8% to 2.2%, the aluminum content is 1.1% to 1.3%, the titanium content is 2.2% to 2.4%, the boron content is 0.002% to 0.015%, the zirconium content is 0.005% to 0.4%, and the carbon content is 0.08% to 0.12%, wherein the alloy contains at least 18 volume percent of a gamma-prime precipitate phase, wherein the alloy is in the form of a cast nozzle of a gas turbine engine, and wherein the nozzle is installed in a second or third turbine stage of the gas turbine engine.
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