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TECHNICAL PAPERS

Microscopic Damage Mechanism of Nickel-Based Superalloy Inconel 738LC Under Creep-Fatigue Conditions

[+] Author and Article Information
Masato Yamamoto, Takashi Ogata

Central Research Institute of Electric Power Industry, Materials Science Department, 2-11-1, Iwado-kita, komae-shi, Tokyo, 201-8511, Japan

J. Eng. Mater. Technol 122(3), 315-320 (Mar 01, 2000) (6 pages) doi:10.1115/1.482803 History: Received November 24, 1999; Revised March 01, 2000
Copyright © 2000 by ASME
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References

Nazmy,  M. Y., 1983, “High Temperature Low Cycle Fatigue of IN 738 and Application of Strain Range Partitioning,” Metall. Trans. A, 14A, pp. 449–461.
Antill, M., and Smith, D. J., 1996, “The interaction of creep and fatigue in IN738LC at 850°C,” IMechE Sixth International Conference on Creep and Fatigue, pp. 231–240.
Russel, E. S., 1986, “Practical Life Prediction Methods for Thermal-Mechanical Fatigue of Gas Turbine Buckets,” Proceedings of the Conference on Life Prediction for High-Temperature Gas Turbine Materials, V. Weiss and W. T. Bakker, eds., EPRI Report AP-4477, Palo Alto, CA, pp. 3–1 to 3–39.
Bernstein,  H. L., and Allen,  J. M., 1992, “Analysis of Cracked Gas Turbine Blades,” ASME J. Eng. Gas Turbines Power, 114, pp. 293–301.
Ostergren,  W. J., 1976, “A Damage Function and Associated Failure Equations for Predicting Hold Time and Frequency Effects in Elevated Temperature Low Cycle Fatigue,” J. Test. Eval., 4–5, pp. 327–339.
Ogata, T., and Nitta, A., 1998, “Low Cycle Fatigue and Elasto-Plastic Behavior of Materials,” K. T. Rie and P. D. Portella, eds., Elsevier Science Ltd., pp. 703–708.

Figures

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Basic configuration of the fatigue testing machine with a scanning electron microscope
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Relationship between the number of cycles to failure Nf and total strain range Δε
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Effect of the length of strain hold time tH on reduction of failure life
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Relationship between the number of cycles to failure Nf and the maximum tensile stress σmax
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Grain boundary damage process under the TH and CH conditions
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Longitudinal cross section near the observation surfaces after the tests
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Stress relaxation property in a strain hold period and the proposed damage parameters
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Relationship between the minimum creep strain rate and elongation
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Comparison between the observed and predicted failure life

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