Measurement of Strain Localization Resulting from Monotonic and Cyclic Loading at 650 C in Nickel Base Superalloys

J. C. Stinville, M. P. Echlin, P. G. Callahan, V. M. Miller, D. Texier, F. Bridier, P. Bocher, T. M. Pollock

Research output: Contribution to journalArticlepeer-review

Abstract

A methodology is presented for the use of the oxide scale that develops in polycrystalline Ni-base superalloys at service temperature, as a speckle pattern for μm-scale resolution strain measurements. Quantitative assessment of the heterogeneous strain field at the grain scale is performed by high-resolution SEM digital image correlation under monotonic and cyclic loading in polycrystalline Ni-base superalloys up to 650 C. In the René 88DT superalloy, strain localization is observed near twin boundaries during low cycle fatigue (LCF) at intermediate temperatures, correlating with activation of {111} 〈110〉 and {111} 〈112〉 slip systems. A strong correlation between the microstructural configuration that promotes strain localization during monotonic loading and crack initiation at 650 C in low cycle fatigue was observed.

Original languageEnglish (US)
Pages (from-to)1289-1309
Number of pages21
JournalExperimental Mechanics
Volume57
Issue number8
DOIs
StatePublished - Oct 1 2017
Externally publishedYes

Keywords

  • High resolution digital image correlation
  • High temperature fatigue
  • Polycrystalline superalloy
  • Rene88DT
  • Strain localization

ASJC Scopus subject areas

  • Aerospace Engineering
  • Mechanics of Materials
  • Mechanical Engineering

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