Analysis of partially pulsating fatigue process on carbon steel with microstructural observation

Hiroyuki Shimano*, M. Khairi Faiz, Asato Hara, Kyoko Yoshizumi, Makoto Yoshida, Susumu Horibe

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review


Pulsating low-cycle fatigue processes, up to the present, have been divided into three states: the transient state, steady state, and accelerating state of ratcheting. In our previous work, we suggested that fatigue behavior of pulsating fatigue process should be classified into five stages in which the plastic strain amplitude and the ratcheting strain rate are plotted on the X and Y axis, respectively. In this study, at the condition of R = -0.3 (partially pulsating fatigue), the change in the plastic strain amplitude and ratcheting strain rate for each cycle to failure was examined on AISI 1025 carbon steel. The dislocation substructure was examined using transmission electron microscopy (TEM) for each stage, except for stage I. It was also demonstrated that the fatigue process can be divided into five stages: stage I corresponds to the un-pinning of dislocations from the Cottrell atmosphere and propagation of the Luders band. Stage II corresponds to the restriction of dislocation movement by dislocation tangles. Stage III corresponds to the formation of dislocation cells. Stage IV corresponds to the promotion of the to-and-fro (back-and-forth) motion of dislocations by a re-arrangement of the dislocations in the cells. Stage V corresponds to the release of dislocation movement by the collapse of dislocation cells.

Original languageEnglish
Pages (from-to)83-88
Number of pages6
JournalMaterials Science and Engineering A
Publication statusPublished - 2016 Jan 10


  • Carbon steel
  • Fatigue
  • Plastic strain amplitude
  • Ratcheting strain rate
  • TEM

ASJC Scopus subject areas

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


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