Characterization of Twin-Like Structure in a Ferrite-Based Lightweight Steel
- Authors
- 손석수
- Issue Date
- 9월-2016
- Publisher
- KOREAN INST METALS MATERIALS
- Keywords
- electron backscattering diffraction (EBSD); ferrite-based lightweight steel; mechanical properties; metals; thermo-mechanical processing; twinning
- Citation
- METALS AND MATERIALS INTERNATIONAL, v.22, no.5, pp.810 - 816
- Indexed
- SCIE
SCOPUS
KCI
- Journal Title
- METALS AND MATERIALS INTERNATIONAL
- Volume
- 22
- Number
- 5
- Start Page
- 810
- End Page
- 816
- URI
- https://scholar.korea.ac.kr/handle/2021.sw.korea/139866
- DOI
- 10.1007/s12540-016-6113-7
- ISSN
- 1598-9623
- 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 degrees 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 degrees 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 degrees 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.
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