Nickel-based superalloy and articles

摘要

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.

主权项

1. A composition of matter comprising:
about 6.0 wt % aluminum; about 6.5 wt % tantalum; about 4.5 wt % chromium; about 5.0 wt % tungsten; about 2.5 wt % molybdenum; about 4 wt % rhenium; about 12 wt % cobalt; from about 0.2 to about 0.6 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, wherein the composition exhibits a sustained peak low cycle fatigue life at 1800° F./45 ksi of at least 4000 cycles.