Abstract
Ultrafine grained microstructure was produced by repetitive deformation using the side-extrusion method from ultra low carbon steel with an initial grain size of about 150 μm. The repetitive deformations were imposed at a low extrusion speed of 2 mn/min at room temperature. The side-extrusions with lateral pressure were repeated up to 10 passes without rotation. The sample was uniformly deformed by the side-extrusion, and the equivalent strain was 1.15 after a single pass of the side-extrusion. The ultimate tensile strength increased from 200 MPa with an increasing number of side extrusion passes. After 10 passes of side-extrusion, an ultrafine grained steel with a tensile strength of over 1000 MPa and a grain size of 0.5 μm×0.2 μm was developed.
| Original language | English |
|---|---|
| Pages (from-to) | 762-766 |
| Number of pages | 5 |
| Journal | Tetsu-To-Hagane/Journal of the Iron and Steel Institute of Japan |
| Volume | 87 |
| Issue number | 12 |
| DOIs | |
| Publication status | Published - 2001 Dec |
Keywords
- ECAE
- Shear deformation
- Side extrusion
- Steel
- Ultrafine grain
ASJC Scopus subject areas
- Condensed Matter Physics
- Physical and Theoretical Chemistry
- Metals and Alloys
- Materials Chemistry