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Journal of Materials Science

, Volume 46, Issue 15, pp 5245–5251 | Cite as

Characterization of deformation mechanisms during low cycle fatigue of a single crystal nickel-based superalloy

  • H. U. HongEmail author
  • B. G. Choi
  • I. S. Kim
  • Y. S. Yoo
  • C. Y. Jo
Article

Abstract

The deformation and fracture mechanisms of a single crystal nickel-based superalloy CMSX-4 have been investigated during low cycle fatigue (LCF) tests at temperatures of 750, 850, and 950 °C under strain-controlled R = 0. It was found that LCF lives at 750 and 850 °C were similar and longer than those at 950 °C. The specimens tested at 750 and 850 °C showed fatigue crack initiation at internal pores, and their failure occurred by cracking at persistent {111} slip bands. On the other hand, at 950 °C the crack initiated at the oxide-layered surface and propagated along <100> γ channel until fracture. At the two lower temperatures, a/2<110> dislocations with low density was rarely present within γ channels, and a/3<211> partial dislocations were occasionally seen to shear γ′ leaving superlattice stacking faults behind. At 950 °C, homogeneous deformation was produced by perfect dislocation movements of cross-slip and climb in the γ channel and a limited γ′ shearing by superdislocation was observed. At total strain range lower than 0.6%, well-developed polygonal dislocation network formed at rafted γ′ interface. Comparison of dislocation structures revealed that load-controlled LCF tests lead to more severe deformation to specimens than strain-controlled tests.

Keywords

High Cycle Fatigue Partial Dislocation Maximum Tensile Stress High Cycle Fatigue Total Strain Range 

Notes

Acknowledgements

The authors acknowledge the financial support of MKE (Ministry of Knowledge Economy), Account No. UCN248-2865.C, which made this work possible.

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Copyright information

© Springer Science+Business Media, LLC 2011

Authors and Affiliations

  • H. U. Hong
    • 1
    Email author
  • B. G. Choi
    • 1
  • I. S. Kim
    • 1
  • Y. S. Yoo
    • 1
  • C. Y. Jo
    • 1
  1. 1.High Temperature Materials Research GroupKorea Institute of Materials ScienceChangwonSouth Korea

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