Gas turbine nozzle

Details Gas turbine nozzle Gas turbine nozzle

1979-12-12

1981-08-11

Dean, R.

Metal treatment

Compositions

Heat treating

75134F, 75171, 148158, 148162, C22C 1905

Patent

active

042832349

ABSTRACT:
A gas turbine nozzle made of a cast material having a chemical composition which contains 0.2 to 1 wt% carbon, 0.1 to 2 wt% silicon, 0.1 to 2 wt% manganese, 20 to 40 wt% chromium, 0.001 to 0.1 wt% boron, 5 to 20 wt% of at least one of tungsten and molybdenum and the remainder nickel. The material can contain at least one of carbide former which forms MC type carbides, e.g. titanium, niobium, hafnium, tantalum, zirconium and vanadium. The content of the carbide formers is between 0.1 and 2 wt%. Further, the material can contain 0.005 to 2 wt% of at least one of yttrium and aluminum. The material has a heat-treated structure in which eutectic carbides and secondary carbides are dispersed. The gas turbine nozzle made of this cast material exhibits a strength against thermal shock greater than that of conventional gas turbine nozzle made of a cobalt base alloy. Also, corrosion resistance, creep rupture strength, rupture strength and reduction of area are equivalent to or greater than those of the conventional gas turbine nozzle.

REFERENCES:
patent: 3865581 (1975-02-01), Sekino et al.

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