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Metallurgical Transactions A

, Volume 10, Issue 12, pp 1859–1868 | Cite as

Low cycle fatigue of René 80 as affected by prior exposure

  • Stephen D. Antolovich
  • Paul Domas
  • J. L. Strudel
Environmental Interactions

Abstract

Low cycle fatigue of the Ni base alloy René 80 was studied at 871°C. Prior to testing, specimens were exposed for 100 h at 982°C either stress-free or at 97 MPa (1/3 the yield). The LCF studies were supplemented by tensile and creep tests. The prior exposure caused significant microstructural changes and life reductions which were most pronounced for stress exposed specimens tested at high rates. Dislocation substructures were extensively studied. The deformation mode was constant for all smooth bar fatigue tests and the dislocation arrangements resembled those seen in creep far more closely than those characteristic of tensile deformation. The observed behavior was attributed to time-dependent changes and environmental interactions. The presence of classical creep/fatigue interactions was considered to be of only minor importance in these experiments.

Keywords

Metallurgical Transaction Crack Path Dislocation Substructure Slip Mode Heat Treated Specimen 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© American Society for Metals and the Metallurgical Society of AIME 1979

Authors and Affiliations

  • Stephen D. Antolovich
    • 1
  • Paul Domas
    • 2
  • J. L. Strudel
    • 3
  1. 1.University of CincinnatiCincinnati
  2. 2.Aircraft Engine GroupGeneral Electric Co.Evendale
  3. 3.Centre des MatériauxEcole des Mines de ParisEvery, CedexFrance

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