Microstructural Evolution during Simple Heavy Warm Deformation of a Low-Carbon Steel |
| Journal |
Materials Science Forum (Volume 512) |
| Volume |
Advanced Structural and Functional Materials Design |
| Edited by |
Yukichi Umakoshi and Shinji Fujimoto |
| Pages |
49-54 |
| DOI |
10.4028/www.scientific.net/MSF.512.49 |
| Online since |
April, 2006 |
| Authors |
S.V.S. Narayana Murty,
Shiro Torizuka,
Kotobu Nagai
|
| Keywords |
Heavy Warm Deformation, Low Carbon Steel, Ultra-Fine Ferrite, Zener-Hollomon Parameter |
| Abstract |
We examined the microstructure development in low carbon steel (0.15% C) during heavy warm deformation (HWD) using field emission scanning electron microscopy (FESEM) and electron back-scattering diffraction (EBSD). Plane strain compression tests have been conducted in the temperature
range of 773-923 K at strain rates of 0.01 s-1 and 1 s-1 with the specimens deformed to 25% of their original thickness. We summarize the strain rate and temperature into the Zener-Hollomon parameter and investigate its variation with plastic strain on the basis of the evolved microstructures and grain boundary character with a view to understanding the critical conditions for forming ultrafine grains and classifying them. Once established, these compressive strain-Z parameter plots simplify the selection of processing parameters (such as strain, strain rate, and temperature), towards achieving tailor-made microstructures in industrial components. |
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