Effect of dislocation density on the initiation of plastic deformation on Fe-C steels

Kaoru Sekido, Takahito Ohmura, Toru Hara, Kaneaki Tsuzaki

Research output: Contribution to journalArticlepeer-review

14 Citations (Scopus)

Abstract

The effect of pre-existing dislocations and interstitial carbon on the initiation of plastic deformation in interstitial free (IF) steel and ultra low carbon (ULC) steel were investigated by the nanoindentation technique. The critical load, P c, of the pop-in phenomenon, which corresponds to plasticity initiation, appeared clearly on the loading curve. The P c in high dislocation density materials was smaller than that in low dislocation density materials with no difference between IF and ULC while the P c in low dislocation density materials was remarkably higher in ULC than in IF. These results indicate that the interstitial carbon in the matrix does not affect the pop-in phenomenon when there are pre-existing dislocations or dislocation sources, and we discuss the reason for their occurrence occurs in high dislocation density materials.

Original languageEnglish
Pages (from-to)907-912
Number of pages6
JournalMaterials Transactions
Volume53
Issue number5
DOIs
Publication statusPublished - 2012

All Science Journal Classification (ASJC) codes

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

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