Characterization of twin-like structure in a ferrite-based lightweight steel

Pooriya Dastranjy Nezhadfar, Abbas Zarei-Hanzaki, Seok S Sohn, Hamid Reza Abedi

Research output: Contribution to journalArticle

12 Citations (Scopus)

Abstract

The present study examined cold to warm compressive deformation behavior of a ferrite- based lightweight steel through characterization of the banded structures. Compression tests were carried out at 25 to 500 °C at a strain rate of 0.01 s -1 up to true strain of 0.6. Analysis of the microstructural evolution using electron back scatter diffraction indicated that the twin-like bands in the large ferrite grains occurred with the {112}[111] system at a 60° misorientation. Density of the twin-like bands is increased by raising the deformation temperature. EBSD results showed that the primary and secondary twins occurred in the [-11-1] and [1-1-1] directions. In addition, the strain at 500 °C distorted the twin-like bands and resulted in wavy boundaries. The strain hardening behavior was also examined using the Crussard-Jaoul (C-J) model and the n-values were calculated for each stage of imposing strain. The results showed high dislocation density in the adjacent of twin-like boundaries intersections which resulted in the n-value increment.

Original languageEnglish
Pages (from-to)810-816
Number of pages7
JournalMetals and Materials International
Volume22
Issue number5
DOIs
Publication statusPublished - 2016 Sep 1
Externally publishedYes

Keywords

  • electron backscattering diffraction (EBSD)
  • ferrite-based lightweight steel
  • mechanical properties
  • metals
  • thermo-mechanical processing
  • twinning

ASJC Scopus subject areas

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

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