Formation of ultrafine grained microstructures in steel through strain induced transformation during single pass hot rolling

被引：13

作者：

Beladi, H ^{[1
]}

Zarei-Hanzaki, A

Kelly, GL

Hodgson, PD

机构：

[1] Deakin Univ, Sch Engn & Technol, Geelong, Vic 3217, Australia

[2] Univ Tehran, Fac Engn, Tehran, Iran

来源：

MATERIALS SCIENCE AND TECHNOLOGY | 2004年 / 20卷 / 02期

关键词：

carbon steels; rolling; ultrafine grain size;

D O I：

10.1179/026708304225010361

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

In the present study, wedge-shape samples were used to study the effect of strain induced transformation on the formation of ultrafine grained structures in steel by single pass rolling. The results showed two different transition strains for bainite formation and ultrafine ferrite (UFF) formation in the surface layer of strip at reductions of 40% and 70%, respectively, in a plain carbon steel. The bainitic microstructure formed by strain induced bainitic transformation during single pass rolling was also very fine. The evolution of UFF formation in the surface layer showed that ferrite coarsening is significantly reduced through strain induced transformation combined with rapid cooling in comparison with the centre of the strip. In the surface, the ferrite coarsening mostly occurred for intragranular nucleated grains (IG) rather than grain boundary (GB) ferrite grains. The results suggest that normal grain growth occurred during overall transformation in the GB ferrite grains. In the centre of the strip, there was significantly more coarsening of ferrite grains nucleated on the prior austenite grain boundaries.

引用

页码：213 / 220

页数：8

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