Study of the applicability of C1 for correlating crack growth rates at elevated temperature in alloy 800H |
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| Affiliation: | 1. Department of Biological Sciences, University of Arkansas, Fayetteville, AR, USA;2. Finch Research Network, Cortland, New York, USA;1. School of Chemistry and Chemical Engineering, Shandong University of Technology, Zibo 255049, PR China;2. Department of Applied Chemistry, Faculty of Science and Engineering, Saga University Honjo-machi 1, 840-8502 Saga, Japan;3. Chemistry, School of Natural Sciences, The University of Hull, Cottingham Road, HU6 7RX Hull, Yorkshire, UK;1. CLINICAL STUDY SUPPORT, Inc., Nagoya, Japan;2. Clinical Research Center for Occupational Musculoskeletal Disorders, Kanto Rosai Hospital, 1-1 Kizukisumiyoshicho, Nakahara-ku, Kawasaki 211-8510, Japan |
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| Abstract: | Crack growth in Alloy 800H in a temperature range of 650 to 900°C for various loading conditions was examined in this study. Creep and hold time crack growth rates were shown to be correlated satisfactorily by C1 even for the hold period as short as 1 minute at 650°C. The fatigue loading portion of the cycle in hold time tests apparently has little effect on crack growth mechanisms at 650°C. This conclusion can be verified by 1.) load-line deflection versus crack length plots, 2.) microhardness profiles ahead of the crack tip, and 3.) examination of the fracture surfaces. At higher temperatures, C1 still provides adequate correlation of creep crack growth rates in this alloy. |
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