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TECHNICAL PAPERS: Gas Turbines: Structures and Dynamics

High-Temperature Fatigue Properties of Single Crystal Superalloys in Air and Hydrogen

[+] Author and Article Information
N. K. Arakere

Mechanical Engineering Department, University of Florida, Gainesville, FL 32611-6300e-mail: nagaraj@ufl.edu

J. Eng. Gas Turbines Power 126(3), 590-603 (Aug 11, 2004) (14 pages) doi:10.1115/1.1501075 History: Received December 01, 2000; Revised March 01, 2001; Online August 11, 2004
Copyright © 2002 by ASME
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References

Figures

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Stage I type global octahedral failure mode (289)
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Noncrystallographic stage II type of failure (289)
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Blade LE tip cracks discovered during inspection in AHPFTP units (511)
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Population of cracked blades relative to geometry (511)
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Tip crack depth versus secondary orientation (β) for AHPFTP first blades (511)
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Variation in pressure and suction side wall thickness unbalance in the AHPFTP first stage blade (511)
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Simple three-dimensional airfoil model of blade geometry (5)
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First-Stage blade finite element model and casting or material coordinate system (6)
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Strain range versus cycles to failure for low cycle fatigue test data (PWA 1480 at 1200°F)
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Shear stress amplitude [Δτmax] versus N
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Low cycle fatigue data for PWA 1493 at room temperature in 5000 psi high-pressure hydrogen: strain amplitude versus cycles to failure
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Shear stress amplitude (Δτmax) versus cycles to failure for PWA 1493 at room temperature in 5000 psi hydrogen power-law curve fit (R2=0.246): Δτ=238,349 N−0.1095
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Low cycle fatigue data for PWA 1493 at 1400°F in 5000 psi high-pressure hydrogen: strain amplitude versus cycles to failure
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Low cycle fatigue data for PWA 1493 at 1600°F in 5000 psi high-pressure hydrogen: strain amplitude versus cycles to failure
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Shear stress amplitude (Δτmax) versus cycles to failure for PWA 1493 at 1400°F in 5000 psi hydrogen power-law curve fit (R2=0.661): Δτ=223,516 N−0.1023
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Shear stress amplitude (Δτmax) versus cycles to failure for PWA 1493 at 1600°F in 5000 psi hydrogen power-law curve fit (R2=0.9365): Δτ=381,241 N−0.2034
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Low cycle fatigue data for SC 7-14-6 at 1800°F in air: strain amplitude versus cycles to failure (14)
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Shear stress amplitude (Δτmax) versus cycles to failure for SC 7-14-6 at 1800°F in air power-law curve fit (R2=0.7931): Δτ=230,275 N−0.1675

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