Microstructure development of steel during severe plastic deformation

Setsuo Takaki, Toshihiro Tsuchiyama, Koichi Nakashima, Hideyuki Hidaka, Kenji Kawasaki, Yuichi Futamura

Research output: Contribution to journalArticlepeer-review

34 Citations (Scopus)

Abstract

The microstructure development during plastic deformation was reviewed for iron and steel which were subjected to cold rolling or mechanical milling (MM) treatment, and the change in strengthening mechanism caused by the severe plastic deformation (SPD) was also discussed in terms of ultra grain refinement behavior. The micro-structure of cold-rolled iron is characterized by a typical dislocation cell structure, where the strength can be explained by dislocation strengthening. It was confirmed that the increase in dislocation density by cold working is limited at 1016m-2, which means the maximum hardness obtained by dislocation strengthening is HV3.7 GPa. However, the iron is abnormally work-hardened over the maximum dislocation strengthening by SPD of MM because of the ultra grain refinement caused by the SPD. In addition, impurity of carbon plays an important role in such grain refinement: the carbon addition leads to the formation of nano-crystallized structure in iron.

Original languageEnglish
Pages (from-to)533-539
Number of pages7
JournalMetals and Materials International
Volume10
Issue number6
DOIs
Publication statusPublished - Dec 2004

All Science Journal Classification (ASJC) codes

  • Condensed Matter Physics
  • Mechanics of Materials
  • Metals and Alloys
  • Materials Chemistry

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