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TECHNICAL PAPERS: Gas Turbines: Manufacturing, Materials & Metallurgy

Strain-Life Assessment of Grainex Mar-M 247 for NASA’s Turbine Seal Test Facility

[+] Author and Article Information
Irebert R. Delgado

Vehicle Technology Directorate, U.S. Army Research Laboratory, NASA Glenn Research Center, Cleveland, OH 44135

Gary R. Halford, Bruce M. Steinetz

NASA Glenn Research Center, Cleveland, OH 44135

Clare M. Rimnac

Case Western Research University, Cleveland, OH 44106

J. Eng. Gas Turbines Power 127(3), 615-620 (Jun 24, 2005) (6 pages) doi:10.1115/1.1852563 History: Received October 01, 2003; Revised March 01, 2004; Online June 24, 2005
Copyright © 2005 by ASME
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References

Figures

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NASA Glenn Research Center turbine seal test facility
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Sample load- and strain-time history indicating Ni
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Crack initiation strain-life results for Grainex Mar-M 247: R=0, 649°C, triangular wave form, 0.33 Hz. Ni was plotted on the abscissa, while %Δε was plotted on the ordinate.
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Cycles to failure strain-life results for Grainex Mar-M 247: R=0, 649°C, triangular wave form, 0.33 Hz. Nf is plotted on the abscissa, while %Δε is plotted on the ordinate.
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Strain-life prediction using the method of universal slopes equation and Grainex Mar-M 247 tensile data at 649°C
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Comparison of MUS, MUS with mean stress effects, and data for Grainex Mar-M 247 at 649°C
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Comparison of NASA Grainex Mar-M 247, R=0 data with the modified Morrow equation at 649°C
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Variation of mean stress and range of stress with strain amplitude at Nf/2 for Grainex Mar-M 247 at 649°C 9
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Typical fatigue crack growth stages for Grainex Mar-M 247 strain-life specimen at 649°C. SEM—BE mode at 100×.
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Comparison of NASA Grainex Mar-M 247, R=0 strain-life data with literature 10

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