| 摘要 |
A nickel-base superalloy that exhibits oustanding mechanical properties unde r high temperature and high strain conditions when cast in an equiaxed and/or directionally solidified, columnar grain structure, and which exhibits increased grain boundary strenght and ductility while maintaining microstrucural stability includes, in percentages by weight, 5-6 chromium, 9 - 9.5 cobalt, 0.3-0.7 molybdenum, 8-9 tungsten, 5.9-6.3 tantalum, 0.05-0.25 titanium, 5.6-6.0 aluminium, 2.8-3.1 rhenium, 1.1-1.8 hafnium, 0.10-0.12 carbon, 0.010-0.024 boron, 0.011-0.020 zirconium, with the balance being nickel and incidental impurities. The superalloys of this invention are usef ul for casting gas turbine engine components exhibiting significantly improved low cycle fatigue life, improved airfoil high temperature stree rupture life , significantly reduced life cycle cost, and longer useful life.
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