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Research of Twin Induced LCF Cracking the 718 Alloy Using In-Situ Observation

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Proceedings of the 9th International Symposium on Superalloy 718 & Derivatives: Energy, Aerospace, and Industrial Applications

Part of the book series: The Minerals, Metals & Materials Series ((MMMS))

Abstract

The 718 alloy possesses excellent mechanical properties at high temperatures, good process ability, therefore, it has been widely used in aero engine turbine disks, compressor disks, and power turbine shafts (i.e., rotating components). The fatigue properties of the 718 alloy are a key factor that determines the safety and reliability of the engine. In this paper, the fatigue properties of the 718 alloy are investigated under high temperature conditions at 455 and 600 °C. The initiation of fatigue cracks, and the relationship between fatigue life and grain size are discussed. The results show that the twin boundaries in large grains and carbides are acting as a crack initiation site for plate specimens, and string-type or heap-type carbides distribution promotes crack propagation and shortens fatigue life. Carbides respond as a crack initiation site for cylindrical specimens. The grain size is smaller, and the low cycle fatigue properties of the alloy are improved.

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Acknowledgements

The authors would like to acknowledge the financial support of the National Important Base Research and Development Program of China under Contract Number 2010CB631203.

Author information

Authors and Affiliations

  1. Beijing Key Laboratory of Advanced High Temperature Materials, Central Iron and Steel Research Institute, Beijing, 100081, China

    Lu Xudong, Du Jinhui, Deng Qun, Wang Minqing & Bi Zhongnan

  2. Fushun Special Steel Co., Ltd., Fushun, 113001, Liaoning, China

    Zhang Yuchun

Authors
  1. Lu Xudong
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  2. Du Jinhui
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  3. Deng Qun
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  4. Wang Minqing
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  5. Bi Zhongnan
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  6. Zhang Yuchun
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Corresponding author

Correspondence to Lu Xudong .

Editor information

Editors and Affiliations

  1. General Electric, Cincinnati, Ohio, USA

    Eric Ott

  2. West Virginia University, Morgantown, West Virginia, USA

    Xingbo Liu

  3. University West, Trollhättan, Sweden

    Joel Andersson

  4. China Iron and Steel Research Institute, Beijing, China

    Zhongnan Bi

  5. ‎ATI Specialty Materials, Monroe, North Carolina, USA

    Kevin Bockenstedt

  6. Wyman Gordon Forgings Inc., Houston, Texas, USA

    Ian Dempster

  7. General Electric, Cincinnati, Ohio, USA

    Jon Groh

  8. Carpenter Technology, Philadelphia, Pennsylvania, USA

    Karl Heck

  9. United States Department of Energy, Albany, New York, USA

    Paul Jablonski

  10. Pratt & Whitney, East Hartford, Connecticut, USA

    Max Kaplan

  11. Honda Motor Co. Ltd., Saitama, Japan

    Daisuke Nagahama

  12. QuesTek Innovations, Evanston, Illinois, USA

    Chantal Sudbrack

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© 2018 The Minerals, Metals & Materials Society

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Xudong, L., Jinhui, D., Qun, D., Minqing, W., Zhongnan, B., Yuchun, Z. (2018). Research of Twin Induced LCF Cracking the 718 Alloy Using In-Situ Observation. In: Ott, E., et al. Proceedings of the 9th International Symposium on Superalloy 718 & Derivatives: Energy, Aerospace, and Industrial Applications. The Minerals, Metals & Materials Series. Springer, Cham. https://doi.org/10.1007/978-3-319-89480-5_50

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