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 language | English |
|---|---|
| Pages (from-to) | 810-816 |
| Number of pages | 7 |
| Journal | Metals and Materials International |
| Volume | 22 |
| Issue number | 5 |
| DOIs | |
| Publication status | Published - 2016 Sept 1 |
| Externally published | Yes |
Bibliographical note
Publisher Copyright:© 2016, The Korean Institute of Metals and Materials and Springer Science+Business Media Dordrecht.
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