Laura Giovanna Carroll

US Patent:

20110076179, Mar 31, 2011

Filed:

Mar 24, 2009

Appl. No.:

12/409929

Inventors:

Kevin Swayne O'Hara - Boxford MA, US
Laura Jill Carroll - Ammon ID, US

International Classification:

C22C 19/05

US Classification:

420443, 420445, 420447, 420448

Abstract:

A nickel-base superalloy composition including (measured in % by weight) from about 6.8 to about 7.5% aluminum, from about 4 to about 8% tantalum, from about 4 to about 10% chromium, from about 2 to about 7% tungsten, from 0 to about 6% rhenium, from 0 to about 5% cobalt, from 0 to about 0.2% silicon, optionally, from about 0.15 to about 0.7% hafnium, from 0 to about 0.5% titanium, from 0 to about 4% molybdenum, from 0 to about 0.005% boron, from 0 to about 0.06% carbon, from 0 to about 0.03% of a rare earth addition selected from the group consisting of yttrium, lanthanum, cesium, and combinations thereof, balance nickel and incidental impurities. The nickel-base superalloy composition may be used in single-crystal or directionally solidified superalloy articles such as high pressure turbine blades for a gas turbine engine.

US Patent:

20110120597, May 26, 2011

Filed:

Dec 26, 2007

Appl. No.:

11/964664

Inventors:

Kevin Swayne O'Hara - Boxford MA, US
Laura Jill Carroll - West Chester OH, US

International Classification:

C22C 19/05

US Classification:

148428, 420445, 420448

Abstract:

Low rhenium nickel base superalloy compositions and articles formed from the superalloy composition are provided. The nickel base superalloy composition includes in percentages by weight: about 5-8 Cr; about 6.5-9 Co; about 1.3-2.5 Mo; about 4.8-6.8 W; about 6.0-7.0 Ta; if present, up to about 0.5 Ti; about 6.0-6.4 Al; about 1-2.3 Re; if present, up to about 0.6 Hf; if present, up to about 0-1.5 C; if present, up to about 0.015 B; the balance being nickel and incidental impurities. Exemplary compositions are characterized by an Re ratio defined as the weight % of Re relative to the total of the weight % of W and the wt % of Mo, of less than about 0.3. Exemplary articles include airfoils for gas turbine engine blades or vanes, nozzles, shrouds, and splash plates.

US Patent:

20130230405, Sep 5, 2013

Filed:

Dec 26, 2007

Appl. No.:

11/964668

Inventors:

Kevin Swayne O'Hara - Boxford MA, US
Laura Jill Carroll - West Chester OH, US

International Classification:

F01D 5/14
C22C 19/05

US Classification:

416241 R, 420445

Abstract:

A nickel base superalloy composition substantially free of rhenium includes, in percentages by weight: about 5-8 Cr; about 7-8 Co; about 1.3-2.2 Mo; about 4.75-6.75 W; about 6.0-7.0 Ta; if present, up to about 0.5 Ti; about 6.0-6.4 Al; about 0.15-0.6 Hf; if present, from about 0.03-0.06 C; if present, up to about 0.004 B; if present, one or more rare earths selected from Y, La, and Ce up to about 0.03 total, the balance including nickel and incidental impurities. The superalloy composition is able to provide sustained-peak low cycle fatigue and/or oxidation resistance properties comparable to second generation superalloy compositions including at least about 3 wt % rhenium. Superalloy articles incorporating the compositions include nozzles, shrouds, and splash plates for gas turbine engines.