High temperature low cycle fatigue characterization of equiaxed MAR-M-247

Gianluca Maggiani, Matthew Roy, Philip Withers

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Abstract

Low cycle fatigue tests have been performed at 1038C on equiaxed MAR-M-247 under a mean compressive strain. Strain ranges assessed were 0.4, 0.6 and 0.8%, with this test program reflecting industrial gas turbine duty cycles. Fractographic analysis demonstrated transgranular crack propagation with intergranular fast fracture. Heavily oxidized secondary cracks were observed throughout. The details of a Lemaitre-Chaboche constitutive model that has been applied to the experimental stress-strain response are described. It was found
that this model was capable of capturing both plastic shakedown and kinematic hardening effects with a high degree of accuracy (R2 up to 0.997 and SSE up to 6E+4). The suitability of extending this model to address different strain histories are detailed.
Original languageEnglish
Pages (from-to)225-237
Number of pages13
JournalInternational Journal of Fatigue
Volume123
Early online date19 Feb 2019
DOIs
Publication statusPublished - 2019

Keywords

  • Fracture
  • Lemaitre-Chaboche
  • Low cycle fatigue
  • MAR-M-247

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