Visualization of dislocations through electron channeling contrast imaging at fatigue crack tip, interacting with pre-existing dislocations

Kishan Habib, Motomichi Koyama, Toshihiro Tsuchiyama, Hiroshi Noguchi

Research output: Contribution to journalArticle

9 Citations (Scopus)

Abstract

The dislocation pattern at the tip of a non-propagating fatigue crack in an Fe-25Cr-1N steel (mass%) was characterized by electron channeling contrast imaging. Planar dislocation arrays on two different slip planes were observed at the crack tip. Each planar dislocation array acts as a barrier to the motion of the other planar dislocations on different slip planes, contributing to the enhancement of the resistance to the crack propagation. This paper employs ‘electron-channeling-contrast-imaging (ECCI) in scanning electron microscope’ technique to visualize fatigue crack tip dislocations in high nitrogen steel, and it showed highly planar dislocations interacting with pre-existing dislocations assisting non-propagating fatigue crack.

Original languageEnglish
Pages (from-to)61-66
Number of pages6
JournalMaterials Research Letters
Volume6
Issue number1
DOIs
Publication statusPublished - 2018 Jan 2
Externally publishedYes

Keywords

  • Crack tip dislocation
  • Electron channeling contrast imaging
  • High nitrogen steel
  • Non-propagating fatigue crack
  • Planar dislocation array

ASJC Scopus subject areas

  • Materials Science(all)

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