Cycle-dependent creep-fatigue deformation and life predictions in a nickel-based superalloy at elevated temperature

Lv Yi Cheng, Run Zi Wang, Ji Wang, Shun Peng Zhu, Peng Cheng Zhao, Hideo Miura, Xian Cheng Zhang, Shan Tung Tu

Research output: Contribution to journalArticlepeer-review

Abstract

A series of strain-controlled creep-fatigue tests with various dwell times and strain ratios are carried out on a nickel-based superalloy at 650 °C. Aiming at the mechanical understanding of creep-fatigue behavior, a non-unified constitutive framework is used to describe macroscopic cyclic deformation process to understand creep-fatigue behavior. Afterward, the quantitative evaluation of creep-fatigue damage is quantitatively determined by the cycle-by-cycle strain energy density exhaustion (SEDE) approach. The effects of strain ratio and dwell time on creep-fatigue life endurances can be well revealed by the proposed life model, where all the data points are predicted within ± 1.5 error band. Particularly, life prediction capacities with long dwell times are further improved based on three-regime creep mechanism.

Original languageEnglish
Article number106628
JournalInternational Journal of Mechanical Sciences
Volume206
DOIs
Publication statusPublished - 2021 Sep 15

Keywords

  • Creep-fatigue
  • Dwell time
  • Life prediction
  • Non-unified model
  • Strain ratio

ASJC Scopus subject areas

  • Civil and Structural Engineering
  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering

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