Microstructure evolution and mechanical properties of ultrafine grained IF steel via multipass differential speed rolling

Title
Microstructure evolution and mechanical properties of ultrafine grained IF steel via multipass differential speed rolling
Author(s)
고영건이재식로렌쯔
Keywords
CHANNEL ANGULAR EXTRUSION; HIGH-PRESSURE TORSION; AZ31 MAGNESIUM ALLOY; TEMPERATURE; TEXTURE
Issue Date
201305
Publisher
MANEY PUBLISHING
Citation
MATERIALS SCIENCE AND TECHNOLOGY, v.29, no.5, pp.553 - 558
Abstract
The microstructural evolution and mechanical properties of ultrafine grained interstitial free steel fabricated by multipass differential speed rolling (DSR) technique were investigated. A series of DSR operations were performed up to four passes under a roll speed ratio of 1 : 4 for lower and upper rolls. Microstructural observations using a transmission electron microscope showed that the deformed microstructure comprised the severely deformed ferrite grains with a mean size of similar to 0.7 mu m having a relatively high dislocation density. In addition, the nearly equiaxed grains were effectively formed due to the sample rotation of 180 degrees around the transverse axis between each passage where the macroscopic shearing was reversed. Electron backscattered diffraction analysis revealed an increase in the fraction of the high angle grain boundaries in the severely deformed samples with increasing number of DSR operations. The mechanical properties were also examined utilising microhardness and tensile tests, and these were discussed in relation to the shearing and microstructural characteristics.
URI
http://hdl.handle.net/YU.REPOSITORY/25891http://dx.doi.org/10.1179/1743284712Y.0000000189
ISSN
0267-0836
Appears in Collections:
공과대학 > 신소재공학부 > Articles
Files in This Item:
There are no files associated with this item.
Export
RIS (EndNote)
XLS (Excel)
XML


qrcode

Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.

BROWSE