Dynamic strain-induced ferrite transformation (DSIT) in steels

Hodgson, P. D. and Beladi, H. 2012, Dynamic strain-induced ferrite transformation (DSIT) in steels. In Pereloma, Elena and Edmonds, David (ed), Phase Transformations in Steels: Fundamentals and Diffusion-Controlled Transformations, Woodhead Publishing, Cambridge, Eng., pp.527-554, doi: 10.1533/9780857096104.4.527.

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Title Dynamic strain-induced ferrite transformation (DSIT) in steels
Author(s) Hodgson, P. D.
Beladi, H.ORCID iD for Beladi, H. orcid.org/0000-0003-0131-707X
Title of book Phase Transformations in Steels: Fundamentals and Diffusion-Controlled Transformations
Editor(s) Pereloma, Elena
Edmonds, David
Publication date 2012
Series Volume 1
Chapter number 15
Total chapters 17
Start page 527
End page 554
Total pages 28
Publisher Woodhead Publishing
Place of Publication Cambridge, Eng.
Keyword(s) strain-induced transformation
ultrafine ferrite
dynamic transformation
grain size
thermomechanical processing
dynamic recrystallisation
Summary The goal in the heat treatment or thermomechanical processing of steel is to improve the mechanical properties. For structural steel applications the general aim is to refine the ferrite grain size as this is the only method that improves both the strength and toughness simultaneously. For conventional hot rolling and accelerated cooling processes, it is difficult to refine the grain size below 5. μm without extensive alloying. However, it has been found that inducing transformation during deformation (i.e. dynamic transformation) can lead to grain sizes of the order of 1. μm, even in very simple steel compositions. The exact mechanism(s) for this transformation process are still being debated, and this has also been complicated by recent studies where such grain sizes can be obtained by static transformation from austenite that has been heavily deformed at low temperatures prior to the transformation. This chapter reviews the various major studies related in particular to dynamic transformation and considers the contributions from the deformed austenite structure developed prior to the transformation and the potential for dynamic recrystallisation of the ferrite. A key factor is proposed to be the early three-dimensional impingement of the ferrite which also provides an insight into cases where ultrafine grains are achieved statically.
ISBN 9781845699703
Language eng
DOI 10.1533/9780857096104.4.527
Field of Research 091207 Metals and Alloy Materials
Socio Economic Objective 970109 Expanding Knowledge in Engineering
HERDC Research category B1.1 Book chapter
ERA Research output type B Book chapter
Copyright notice ©2012, Woodhouse Publishing
Persistent URL http://hdl.handle.net/10536/DRO/DU:30071005

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