Real time correlation between flow stress and dislocation density in steel during deformation

Ling Zhang, Nobuaki Sekido, Takahito Ohmura

Research output: Contribution to journalArticlepeer-review

15 Citations (Scopus)

Abstract

We performed in situ compression of interstitial-free steel nanoblades using transmission electron microscopy (TEM) in order to determine the relation between the evolution of the dislocation structures and the flow stress during deformation. In the early stage of deformation, the sample deforms elastically with a few dislocation motions. The dislocation multiplication processes have been discussed. Remarkable plastic softening with increasing dislocation density is observed after the maximum stress is reached, which can be understood as a situation in which the dislocation density is the dominant factor affecting the softening based on the Johnston-Gilman model.

Original languageEnglish
Pages (from-to)188-193
Number of pages6
JournalMaterials Science and Engineering A
Volume611
DOIs
Publication statusPublished - 2014 Aug 12
Externally publishedYes

Keywords

  • Dislocation
  • In situ nanoindentation
  • Interstitial-free steel
  • Johnston-Gilman model
  • Plastic softening

ASJC Scopus subject areas

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

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