Nickel based monocrystalline superalloy, method of heat treating

Details Nickel based monocrystalline superalloy, method of heat treating Nickel based monocrystalline superalloy, method of heat treating

1989-08-10

1991-09-10

Dean, R.

Metal treatment

Compositions

Heat treating

148 131, 148162, 148404, 148410, C22F 110

Patent

active

050470914

ABSTRACT:
A monocrystalline superalloy with a nickel based matrix and particularly intended for the manufacture of turbine blades, has the following composition, by weight: Al=5.4% to 6.2%; Co=4% to 7%; Cr=6% to 9%; Mo=0% to 2.5%; Ta=5.5% to 8%; Ti=O% to 1%; W=7% to 9%; and Ni=balance to 100%.
The invention also provides a method of improving the alloy's resistance to creep, in which the Ni.sub.3 Al type .gamma.' phase is put completely into solution at a first temperature, and then the .gamma.' phase is precipitated into the .gamma. solid solution at a temperature greater than 1000.degree. C. This treatment considerably increases the alloy's resistance to creep over a wide range of temperatures.

REFERENCES:
patent: 4371404 (1983-02-01), Duhl et al.
patent: 4582548 (1986-04-01), Harris et al.

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