Single crystal (single grain) alloy

Details Single crystal (single grain) alloy Single crystal (single grain) alloy

1982-01-15

1986-04-15

Dean, R.

Metal treatment

Stock

Directionally solidified

148 3, 148162, 148410, C22C 1905

Patent

active

045825483

ABSTRACT:
The alloy is a nickel base, superalloy specifically intended for the making of castings which consist of a single crystal. The castings are intended for use under extreme conditions of high temperature and stress. The alloy, for the first time, achieves the desired characteristics of phase stability, high stress-rupture strength and resistance to oxidation while maintaining a sufficient temperature differential between gamma prime solvus and incipient melting temperatures, that it is practical to solution heat treat without unacceptable percentages of rejects due to failure either to completely solution the primary coarse gamma prime or to initiation of incipient melting. In a modified form the coated oxidation/corrosion resistance of the alloy is increased by the addition of a trace quantity of hafnium.

REFERENCES:
patent: 4116723 (1978-09-01), Gell et al.
patent: 4209348 (1980-06-01), Duhl et al.
patent: 4402772 (1983-09-01), Duhl et al.

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