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Nickel-base superalloy, unidirectional-solidification process therefor, and castings formed therefrom
Nickel-base superalloy, unidirectional-solidification process therefor, and castings formed therefrom
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机译:镍基高温合金,其单向凝固工艺以及由此形成的铸件
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摘要
An alloy composition and method by which the incidence of freckling can be reduced in castings (10,32) produced with properties similar to the René N5 nickel-base superalloy. The casting (10,32) has a unidirectional crystal structure and a composition consisting of, by weight, 6% to 8% chromium, 6% to 9% cobalt, 0% to 2% molybdenum, 4% to 6% tungsten, 6.4% to 6.9% tantalum, 0% to 2% titanium, 5% to 7% aluminum, 2.7% to 3.0% rhenium, 0.3% to 0.7% hafnium, 0.04% to 0.08% carbon, 0.002% to 0.006% boron, 0% to 0.075% yttrium, 0.002% to 0.004% zirconium, the balance being nickel and incidental impurities.
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