Haynes International, Inc.

Other

Lee Pike

S Krishna Srivastava

Dwaine L Klarstrom

Michael F Rothman

In a method for heat treating alloy compositions within UNS N07028 the alloy composition is heated at a temperature between 1550&#xb0; F. and 1750&#xb0; F. for at least two hours, and then heated at a lower temperature between 1300&#xb0; F. and 1550&#xb0; F. for at least two hours. The alloy composition may be heated at a temperature between 1850&#xb0; F. and 1950&#xb0; F. for at least one hour before heating the alloy composition at a temperature between 1550&#xb0; F. and 1750&#xb0; F.

Heat treatments for improved ductility of Ni&#x2014;Cr&#x2014;Co&#x2014;Mo&#x2014;Ti&#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, 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 two step heat treatment for Ni&mdash;Cr&mdash;Mo alloys containing from 12% to 23.5% chromium provides higher yield strength, high tensile strength and other mechanical properties comparable to those observed in similar alloys age-hardened according to current practices. This treatment is done over a total time of not more than 50 hours. However, the treatment works for only those alloys having alloying elements present in amounts according to an equation here disclosed.

Two step aging treatment for Ni-Cr-Mo alloys

A single step heat treatment for Ni&mdash;Cr&mdash;Mo alloys containing from 12% to 19% chromium and from 18% to 23% molybdenum provides higher yield strength, high tensile strength and other mechanical properties comparable to those observed in similar alloys age-hardened according to current practices. This treatment is done over a total time of at least 4 hours and preferably less than 50 hours. However, the treatment works for only those alloys having alloying elements present in amounts according to an equation here disclosed.

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Kokomo, IN, United States of America

Lee Pike