| 摘要 |
<p>A nickel-based superalloy composition includes from about 5 to about 7 wt% aluminum, from about 4 to about 8 wt% tantalum, from about 3 to about 8 wt% chromium, from about 3 to about 7 wt% tungsten, from 1 to about 5 wt% molybdenum, from 1.5 to about 5 wt% rhenium, from 5 to about 14 wt% cobalt, from about 0 to about 1 wt% hafnium, from about 0.01 to about 0.03 wt% carbon, from about 0.002 to about 0.006 wt% boron, and balance nickel and incidental impurities. The composition may exhibit a sustained peak low cycle fatigue life at 1800°F/45 ksi of at least about 4000 cycles. The nickel-based superalloy composition may be used in single- crystal or directionally solidified superalloy articles, such as a blade, nozzle, a shroud, a splash plate, and a combustor of a gas turbine engine.</p> |
