John Gayda

Glenn Research Center, Cleveland, Ohio

Creep Resistance of Disk Alloy CH98 With

Tungsten and Niobium Additions

NASA/TM—2003-212373

June 2003

https://ntrs.nasa.gov/search.jsp?R=20030063278 2018-05-15T18:31:52+00:00Z
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John Gayda

Glenn Research Center, Cleveland, Ohio

Creep Resistance of Disk Alloy CH98 With

Tungsten and Niobium Additions

NASA/TM—2003-212373

June 2003

National Aeronautics and

Space Administration

Glenn Research Center
Available from

NASA Center for Aerospace Information

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This research was originally published internally as AST030 in May 2000.

Document History
Creep Resistance of Disk Alloy CH98 With Tungsten and Niobium Additions

John Gayda

National Aeronautics and Space Administration

Glenn Research Center

Cleveland, Ohio 44135

NASA/TM—2003-212373 1
NASA/TM—2003-212373 2
NASA/TM—2003-212373 3
NASA/TM—2003-212373 4
NASA/TM—2003-212373 5
NASA/TM—2003-212373 6
NASA/TM—2003-212373 7
NASA/TM—2003-212373 8
This publication is available from the NASA Center for AeroSpace Information, 301–621–0390.

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14

Creep Resistance of Disk Alloy CH98 With Tungsten and Niobium Additions

John Gayda

Superalloy; Creep

Unclassified -Unlimited

Subject Category: 26 Distribution: Nonstandard

Gas turbine engines for future subsonic transports will likely have higher pressure ratios which will require nickelbase superalloy disks with temperature capability up to 1400 °F, an increase of about 200 °F over current engines.

Several advanced disk alloys are being developed to fill this need. One of these, CH98, is a promising candidate for

gas turbine engines and is being studied in NASA's AST Program. Additions of the refractory elements tungsten and

niobium have been shown to improve tensile and creep properties while maintaining good high temperature fatigue

crack growth resistance. Further improvements in creep and crack growth resistance can be achieved with a coarse

grain microstructure. The purpose of the present study is aimed at providing a detailed assessment of 0.2 percent

creep rates for coarse grain CH98 with tungsten and niobium additions over a range of temperatures and stresses of

interest to disk applications.

This research was originally published internally as AST030 in May 2000. Responsible person, John Gayda, organization

code 5120, 216–433–3273.