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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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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