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The evolution of ferrite grain size in structural steels

journal contribution
posted on 1999-01-01, 00:00 authored by Peter HodgsonPeter Hodgson
The refinement of the ferrite grain size is the main aim of modern thermomechanical processes for hot rolled steels. The ferrite grain size is determined by the composition, the state of the austenite at the point of transformation and the cooling rate through transformation. By adding microalloying additions of Ti for grain refinement and Nb to retard recrystallization, it is possible to reduce the ferrite grain size to less than 5 μm at moderate to high cooling rates. However, it is not possible under even the most extreme traditional controlled rolling and accelerated cooling conditions to produce an equiaxed ferrite grain size of less than 3 μm. More recent work, though, involving rolling with high undercooling and friction conditions that lead to high shear, suggests that it is possible to produce microstructures in a single rolling pass with an average grain size less than 1 μm. This appears to involve a dynamic (ie strain induced) transformation process. The current understanding of static and dynamic transformation and the resultant grain size is reviewed and areas requiring further research are highlighted.

History

Journal

Materials forum

Volume

23

Pagination

105 - 115

Publisher

Institute of Materials Engineering Australasia

ISSN

0883-2900

Publication classification

CN.1 Other journal article

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