| 摘要 |
An alloy composition intended for use in the form of a single crystal casting comprises a modified nickel-based superalloy. The alloy consists essentially of, by weight percent, 7-13% Chromium, 0-15% Cobalt, 1.25-3% Titanium+1/2 Niobium, 4.5-6.7% Aluminium, 3-12% Tungsten, 0-3.5% Molybdenum, 0-5% Tantalum, 0-2% Hafnium, 0-1.5% Vanadium, 0.015-0.05% Carbon, 0-0.01% Boron, 0-0.05% Zirconium, Balance essentially Nickel plus incidental impurities. The invention also contemplates a heat treatment for the alloy comprising initially heating to 1300 DEG -1320 DEG C. followed by cooling to room temperature and ageing the alloy at a temperature of about 870 DEG C. for 16 hours.
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