Cobalt-base alloy having high strength and high toughness, produ

Details Cobalt-base alloy having high strength and high toughness, produ Cobalt-base alloy having high strength and high toughness, produ

1987-03-19

1988-12-06

Dean, R.

Metal treatment

Stock

Age or precipitation hardened or strengthened

148158, 148 3, C22C 1907

Patent

active

047894121

ABSTRACT:
A cobalt-base alloy comprises 0.2-1 wt % C 0.4-2 wt % Si, 0.2-1.5 wt % Mn, 5-15 wt % Ni, 20-35 wt % Cr, 3-15 wt % W, 0.003-0.1 wt % Ni, 20-35 wt % Cr, 3-15 wt % W, 0.003-0.1 wt % B, 0.05-1 wt % Nb, 0.01-1 wt % Ta, 2 wt % or less Fe, 30 ppm or less oxygen, 100 ppm or less nitrogen, and the balance of 45 wt % or more Co, wherein the content of Si is larger than that of Mn. The alloy is in a form of casting and has a structure containing a eutectic carbide and a secondary carbide dispersed therein. The cast alloy is produced through solution treatment at 1,100.degree.-1.200.degree. C., and aging treatment at 950.degree.-1,050.degree. C., and cooling rate after the solution treatment and after the aging treatment is 150.degree. to 300.degree. C./h. A gas turbine nozzle is made of a casting of the above-mentioned alloy.

REFERENCES:
patent: 4080202 (1978-03-01), Fukui et al.
patent: 4437913 (1984-03-01), Fukui et al.

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