| 摘要 |
An article and a method for forming the article are disclosed. The article comprising a composition, wherein the composition comprises, by weight percent, about 20.0% to about 22.0% chromium (Cr), about 18.0% to about 20.0% cobalt (Co), about 1.0% to about 2.0% tungsten (W), about 3.0% to about 6.0% niobium (Nb), about 0.5% to about 1.5% titanium (Ti), about 2.0% to about 3.0% aluminum (Al), about 0.5% to about 1.5% molybdenum (Mo), about 0.03% to about 0.18% carbon (C), up to about 0.15% tantalum (Ta), up to about 0.20% hafnium (Hf), up to about 0.20% iron (Fe),balance nickel (Ni) and incidental impurities. The amount of Al is present according to the following formula: Al ‰¤ ˆ’ 0.5 * Ti + 3.75 The composition is weldable, has a microstructure comprising between about 35 vol% and 45 vol% gamma prime (y') and is substantially devoid of Eta and reduced content of TCP phases at elevated working temperatures. A method of making an article and a method of operating a gas turbine are also disclosed. |
