High strength single crystal superalloy

A nickel-base superalloy for single crystal casting, comprising:

• 5.60% to 5.80% by weight of aluminum;
• 9.4% to 9.8% by weight of cobalt;
• 3.2% to 3.9% by weight of chromium;
• 7.8% to 8.5% by weight of tantalum;
• 5.3% to 5.7% by weight of tungsten;
• 0.50% to 0.70% by weight of molybdenum;
• 4.3% to 4.9% by weight of rhenium;
• 0.75% to 0.90% by weight of titanium;
• 0.08% to 0.15% by weight of hafnium;
• a maximum of 5 ppm nitrogen by weight;
• less than 1.1% by weight of elements other than aluminum, cobalt, chromium, tantalum, tungsten, molybdenum, rhenium, titanium and nickel;
• and
• the balance nickel;
• wherein the casting exhibits a time to 2.0% creep under a stress of 248 MPa (36.0 ksi) and at a temperature of 982° C. (1800° F.) of about 320 hours or greater;
• provided that the total amount of tantalum, molybdenum, tungsten and rhenium is from 18.2% to 19.5% by weight;
• and
• provided that the total amount of aluminum, titanium, and tantalum is from 14.25% to 15.0% by weight.

A nickel-base superalloy for single crystal casting, comprising:

• a maximum of 100 ppm by weight of carbon;
• a maximum of 0.04% by weight of silicon;
• a maximum of 0.01% by weight of manganese;
• a maximum of 3 ppm by weight of sulfur;
• a maximum of 30 ppm by weight of phosphorus;
• a maximum of 30 ppm by weight of boron;
• a maximum of 0.15% by weight of niobium;
• a maximum of 150 ppm by weight of zirconium;
• a maximum of 0.01% by weight of copper;
• a maximum of 0.15% by weight of iron;
• a maximum of 0.10% by weight of vanadium;
• a maximum of 0.15% by weight of ruthenium;
• a maximum of 0.25% by weight of platinum;
• a maximum of 0.20% by weight of palladium;
• a maximum of 0.02% by weight of magnesium;
• a maximum of 5 ppm by weight of nitrogen;
• a maximum of 5 ppm by weight of oxygen;
• a maximum of 2 ppm by weight of silver;
• a maximum of 0.2 ppm by weight of bismuth;
• a maximum of 10 ppm by weight of gallium;
• a maximum of 25 ppm by weight of calcium;
• a maximum of 1 ppm by weight of lead;
• a maximum of 0.5 ppm by weight of selenium;
• a maximum of 0.2 ppm by weight of tellurium;
• a maximum of 0.2 ppm by weight of thallium;
• a maximum of 10 ppm by weight of tin;
• a maximum of 2 ppm by weight of antimony;
• a maximum of 2 ppm by weight of arsenic;
• a maximum of 5 ppm by weight of zinc;
• a maximum of 2 ppm by weight of mercury;
• a maximum of 0.2 ppm by weight of cadmium;
• a maximum of 02 ppm by weight of indium;
• a maximum of 2 ppm by weight of germanium;
• a maximum of 2 ppm by weight of gold;
• a maximum of 20 ppm by weight of sodium;
• a maximum of 10 ppm by weight of potassium;
• a maximum of 10 ppm by weight of barium;
• a maximum of 2 ppm by weight of thorium;
• a maximum of 2 ppm by weight of uranium;
• 5.60% to 5.80% by weight of aluminum;
• 9.4% to 9.8% by weight of cobalt;
• 3.2% to 3.9% by weight of chromium;
• 7.8% to 8.5% by weight of tantalum;
• 5.3% to 5.7% by weight of tungsten;
• 0.50% to 0.70% by weight of molybdenum;
• 4.3% to 4.9% by weight of rhenium;
• 0.75% to 0.90% by weight of titanium;
• 0.08% to 0.15% by weight of hafnium;
• and
• the balance nickel;
• wherein the casting exhibits a time to 2.0% creep under a stress of 248 MPa (36.0 ksi) and at a temperature of 982° C. (1800° F.) of about 320 hours or greater;
• provided that the total amount of tantalum, molybdenum, tungsten and rhenium is from 18.2% to 19.5% by weight;
• and
• provided that the total amount of aluminum, titanium, and tantalum is from 14.25% to 15.0% by weight.