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Evolution of Slip Morphology and Fatigue Crack Initiation in Surface Grains of Ni200

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Abstract

The evolution of slipbands into fatigue cracks in surface grains of commercially pure Ni, Ni200 (99.35Ni-0.4Fe-0.25Cu, in wt pct), was studied at ambient temperature. Round-bar specimens with electropolished surfaces were fatigued under displacement-controlled, fully reversed conditions at four strain amplitudes under a nominal strain rate of 1 × 10−3 s−1. Low-cycle fatigue tests were periodically interrupted to characterize the slip morphology at various fatigue cycles using scanning electron microscopy. The results showed that the distribution of slip in Ni200 varied considerably in individual surface grains at a given strain amplitude. Some grains were deformed more severely and exhibited more intense slipbands than others, while some surface grains showed the absence of slip lines with no evidence of plastic deformation. The evolutions of slipband width and spacing in deformed surface grains were followed as a function of fatigue cycles in order to assess the slipband morphology at the onset of fatigue crack initiation.

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  1. Waspaloy is a registered trademark of United Technologies, Hartford, CT.

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Acknowledgments/Disclaimer

This contribution of KSC was supported by the Southwest Research Institute and by the Air Force Office of Scientific Research (AFOSR), USAF, under Contract No. F49620-01-1-0547, and was performed as part of the AFOSR MEANS program, Dr. Craig S. Hartley, program manager. JWT, BY, and PKL are supported by the National Science Foundation International Materials Institute (IMI) program, the Combined Research and Curriculum Development (CRCD) program, and the Center for Materials Processing (CMP) at the University of Tennessee with Dr. C. Huber, Ms. M. Poats, and C.J. McHargue as the program directors, respectively. The views and conclusions contained herein are those of the authors and should not be interpreted as necessarily representing the official policies or endorsements, either expressed or implied, of the Air Force Office of Scientific Research or the United States Government. The authors acknowledge the clerical assistance of Ms. L. Mesa, Southwest Research Institute, in the preparation of the manuscript.

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Author notes

  1. B. Yang (Postdoctoral Research Associate, Materials Engineer)

    Present address: Shell Global Solution, Houston, TX, 77082, USA

Authors and Affiliations

  1. Materials Engineering Department, Southwest Research Institute®, San Antonio, TX, 78238, USA

    K.S. Chan (Institute Scientist)

  2. Department of Materials Science and Engineering, University of Tennessee, Knoxville, TN, 37996, USA

    J.W. Tian (Postdoctoral Research Associate), B. Yang (Postdoctoral Research Associate, Materials Engineer) & P.K. Liaw (Professor)

Authors
  1. K.S. Chan
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  2. J.W. Tian
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  3. B. Yang
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  4. P.K. Liaw
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Corresponding author

Correspondence to K.S. Chan.

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Manuscript submitted January 11, 2009.

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Chan, K., Tian, J., Yang, B. et al. Evolution of Slip Morphology and Fatigue Crack Initiation in Surface Grains of Ni200. Metall Mater Trans A 40, 2545–2556 (2009). https://doi.org/10.1007/s11661-009-9980-4

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  • DOI: https://doi.org/10.1007/s11661-009-9980-4

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