Ultrafine grained low carbon steels fabricated by equal channel angular pressing: Microstructures and tensile properties

Dong Hyuk Shin, Jong Jin Park, Si Young Chang, Young Kook Lee, Kyung Tae Park

Research output: Contribution to journalArticle

42 Citations (Scopus)

Abstract

Equal channel angular pressing (ECAP) was conducted on the two grades of low carbon steel, with or without vanadium, in order to produce an ultarfine grained structure. As a result, the ferrite grains were refined from 30 μm to 0.2-0.3 μm. The strength of the ECAPed steels increased remarkably, over twice of the strength of the steels before ECAP. A series of static annealing experiments showed that the increment of ECAP strain and the dilute addition of microalloying element such as vanadium were very effective on enhancing thermal stability of the ultrafine gained low carbon steels produced by ECAP in terms of microstructure and tensile properties. This enhanced thermal stability resulted from; (a) presence of excessive carbon content in the ferrite matrix by carbon dissolution from peariitic cementite during ECAP; (b) preservation of high dislocation density due to addition of vanadium, providing the effective diffusion path for dissolved carbon atoms; (c) precipitation of excessive carbon as the form of nano-sized cementite particles during subsequent annealing and its effect on suppressing grain growth.

Original languageEnglish
Pages (from-to)1490-1496
Number of pages7
JournalISIJ International
Volume42
Issue number12 SPEC.
DOIs
Publication statusPublished - 2002

All Science Journal Classification (ASJC) codes

  • Mechanics of Materials
  • Mechanical Engineering
  • Metals and Alloys
  • Materials Chemistry

Fingerprint Dive into the research topics of 'Ultrafine grained low carbon steels fabricated by equal channel angular pressing: Microstructures and tensile properties'. Together they form a unique fingerprint.

  • Cite this