Semi-quantitative creep-fatigue damage analysis based on diffraction-based misorientation mapping and the correlation to macroscopic damage evolutions

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

Research output: Contribution to journalArticlepeer-review

Abstract

A large number of strain-controlled creep-fatigue tests under wide loading waveforms are conducted at 650 ℃ in nickel-based forged GH4169 superalloy. Comprehensive characterizations, including scanning electron microscope (SEM), electron backscatter diffraction (EBSD) and transmission electron microscope (TEM), are observed from the post-test examinations. Particular focus is brought to the physical understanding of damage mechanisms under wide creep-fatigue loading conditions using EBSD analysis. The representative misorientation parameters are calculated for constructing diffraction-based misorientation mapping. Semi-quantitative analysis of longitudinal EBSD observations is conducted to prove that strain ratio has little influence on creep-fatigue damage degrees, while dwell time causes noticeable changes to damage progressions. In particular for geometrically necessary dislocation (GND) map explored in this work, more fundamental information based on failure physics is obtained to analyze the creep-fatigue crack initiation mechanism.

Original languageEnglish
Article number106227
JournalInternational Journal of Fatigue
Volume149
DOIs
Publication statusPublished - 2021 Aug

Keywords

  • Crack initiation mechanism
  • EBSD analysis
  • Geometrically necessary dislocation
  • Misorientation

ASJC Scopus subject areas

  • Modelling and Simulation
  • Materials Science(all)
  • Mechanics of Materials
  • Mechanical Engineering
  • Industrial and Manufacturing Engineering

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