Haynes International, Inc.

S Krishna Srivastava

Lee Pike

Ni&#x2014;Cr&#x2014;Co&#x2014;Mo&#x2014;Al based alloys are disclosed which contain 15 to 20 wt. % chromium, 9.5 to 20 wt. % cobalt, 7.25 to 10 wt. % molybdenum, 2.72 to 3.89 wt. % aluminum, certain minor elemental additions, along with typical impurities, a tolerance for up to 10.5 wt. % iron, and a balance of nickel. These alloys are readily fabricable, have high creep strength, good thermal stability, and excellent oxidation resistance up to as high as 2100&#xb0; F. (1149&#xb0; C.). This combination of properties is useful for a variety of gas turbine engine components, including, for example, combustors.

Fabricable, high strength, oxidation resistant Ni&#x2014;Cr&#x2014;Co&#x2014;Mo&#x2014;Al alloys

Ni&#x2014;Cr&#x2014;Co&#x2014;Mo&#x2014;Al based alloys are disclosed which contain 15 to 20 wt. % chromium, 9.5 to 20 wt. % cobalt, 7.25 to 10 wt. % molybdenum, 2.72 to 3.89 wt. % aluminum, certain minor elemental additions, along with typical impurities, a tolerance for up to 10.5 wt. % iron, and a balance of nickel. These alloys are readily fabricable, have high creep strength, and excellent oxidation resistance up to as high as 2100&#xb0; F. (1149&#xb0; C.). This combination of properties is useful for a variety of gas turbine engine components, including, for example, combustors.

Fabricable, high strength, oxidation resistant Ni&#x2014;Cr&#x2014;Co&#x2014;Mo&#x2014;Al Alloys

An alloy designed for use in gas turbine engines which has high strength and a low coefficient of thermal expansion is disclosed. The alloy may contain in weight percent 7% to 9% chromium, 21% to 24% molybdenum, greater than 5% tungsten, up to 3% iron, with a balance being nickel and impurities. The alloy must further satisfy the following compositional relationship: 31.95&#x3c;R&#x3c;33.45, where the R value is defined by the equation:=2.66Al+0.19Co+0.84Cr&#x2212;0.16Cu+0.39Fe+0.60Mn+Mo+0.69Nb+2.16Si+0.47Ta+1.36Ti+1.07V+0.40WThe alloy has better hardness after being age-hardened at 1400&#xb0; F. (760&#xb0; C.) if tungsten is present from greater than 5% up to 10% and a preferred density if the alloy contains greater than 5% up to 7% tungsten.

High temperature low thermal expansion Ni-Mo-Cr alloy

A wroughtable, cobalt alloy capable of through thickness nitridation and strengthening using practical treatments and practical sheet thicknesses contains in weight percent about 23 to about 30% chromium, about 15 to about 25% iron, up to about 27.3% nickel, about 0.75 to about 1.7% titanium, about 0.85 to about 1.9% niobium or zirconium, up to 0.2% carbon, up to 0.015% boron, up to 0.015% rare earth elements, up to 0.5% aluminum, up to 1% manganese, up to 1% silicon, up to 1% tungsten, up to 1% molybdenum, and the balance cobalt plus impurities and the total weight percent of titanium plus niobium or equivalents is from about 1.6 to about 3.6.

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Kokomo, IN, United States of America

S Krishna Srivastava