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The crack growth behavior of Incoloy 800H under fatigue and dwell-fatigue conditions at elevated temperature

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Abstract

Fatigue crack growth rate (FCGR) tests with different load ratios and dwell-fatigue crack growth rate (DFCGR) tests with different dwell times were conducted at 750°C for Incoloy 800H. As the load ratio increases from 0.1 to 0.5, the crack growth rate increased and the transition ΔK value from region I to region II (Paris regime) shifted leftward. In DFCGR tests with dwell time of 10 and 30 seconds, the Paris regime started at relatively lower ΔK level and the crack grew much faster than in FCGR tests. However, the crack growth rates between the 10 sec and 30 sec dwell times were relatively similar. The higher crack growth rates in the DFCGR tests compared to FCGR tests was associated with the reduction of the M23C6 precipitates in the vicinity of the advancing crack by the Cr depletion, suggesting the crack propagation in DFCGR conditions was environmentally assisted. The crack growth rate was controlled by trans-granular mode regardless of the dwell time because the dwell time was not enough to cause creep damage.

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Authors and Affiliations

  1. Department of Mechanical Engineering, Andong National University, Andong, 760-749, Korea

    D. J. Kim

  2. Aerospace, National Research Council of Canada, Ottawa, ON6, Canada

    D. Y. Seo & J. Tsang

  3. Advanced Materials Division, Korea Institute of Materials Science, Changwon, 642-831, Korea

    W. J. Yang & J. H. Lee

  4. Department of Mechanical and Aerospace Engineering, Carleton University, Ottawa, K1S 5B6, Canada

    H. Saari

  5. School of Mechanical Engineering, Sungkyunkwan University, Suwon, 440-746, Korea

    C. S. Seok

Authors
  1. D. J. Kim
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  2. D. Y. Seo
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  3. J. Tsang
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  4. W. J. Yang
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  5. J. H. Lee
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  6. H. Saari
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  7. C. S. Seok
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Correspondence to D. J. Kim.

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Recommended by Guest Editor Dong-Ho Bae

Daejin Kim received his Ph.D. degree in Materials & Solid Mechanics Engineering from Sungkyunkwan University in 2009. During Ph.D. course, he investigated on the estimation of a delamination life of isothermally aged plasmas-prayed TBCs. During his Post-Doc period (Dec. 2009–Feb. 2012) at National Research Council Canada, he worked on the isothermal and cyclic oxidation behaviors of newly developed PM betagamma TiAl alloys. He is currently an associate professor since Mar. 1, 2012 in the Department of Mechanical Engineering at Andong National University and is managing his Machinery and Materials Characterization Lab.

Dongyi Seo received his Ph.D in Materials Science from Michigan State University in 1998. During his Ph.D, he was honoured at the 2nd International Symposium on Structural Intermetallics for the Best Paper Award in 1997. Dr. Seo is currently an associate research officer in the Aerospace, National Research Council Canada and managing several major projects on characterization and evaluation of high temperature materials and coatings, and repair technology. Also, he is an adjunct professor at Department of Mechanical and Aerospace Engineering at Carleton University. He was a chair of Ottawa Chapter of ASM international in 2004/2005 and is acting as a treasure since 2006.

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Kim, D.J., Seo, D.Y., Tsang, J. et al. The crack growth behavior of Incoloy 800H under fatigue and dwell-fatigue conditions at elevated temperature. J Mech Sci Technol 26, 2023–2027 (2012). https://doi.org/10.1007/s12206-012-0507-3

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  • DOI: https://doi.org/10.1007/s12206-012-0507-3

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