Control of Structures and Properties of Cold-Rolled Sheet Steels

Precise microstructural control is essential to obtain the required properties of sheet steels. Since excellent formability is required for mild steels, the control of grain structure and texture are of utmost importance. First, the roles of initial grain boundaries prior to cold rolling, shear band...

Full description

Saved in:
Bibliographic Details
Published in:Materials and manufacturing processes 2010-03, Vol.25 (1-3), p.185-194
Main Authors: Ushioda, Kohsaku, Takebayashi, Shigeto, Abe, Yoshio R.
Format: Article
Language:English
Subjects:
Cold rolling
Grain growth
High strength steel
Mathematical models
Mild steel
Phase transformation
Precipitation
Property
Recrystallization
Steel
Strip steel
Structural steels
Structure
Surface layer
Texture
Transformations
TRIP Steel
TRIP steels
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:Precise microstructural control is essential to obtain the required properties of sheet steels. Since excellent formability is required for mild steels, the control of grain structure and texture are of utmost importance. First, the roles of initial grain boundaries prior to cold rolling, shear bands, and the interaction between C and Mn during recovery are critically reviewed as the essential factors controlling recrystallization texture. A model for the grain size of hot bands in interstitial free (IF) steels is presented in conjunction with texture control. Moreover, the grain growth during annealing, which leads to the development of ND//⟨111⟩texture, is discussed from the viewpoint of the pinning effect due to fine precipitates. The texture memory effect, typically found in Mn-IF steels, is also discussed. Concerning high strength steel sheets, the history of the development is firstly introduced. The discussion is focused on transformation induced plasticity (TRIP) steel by placing an emphasis on the relationship between the mechanical properties and the plastic stability of retained austenite. Furthermore, the prediction model for structures in TRIP steels during the continuous annealing process is presented based on the competitive reaction between bainite transformation and cementite precipitation together with a prediction model for the stress-strain curve. Finally, the factors to be overcome for further strengthening of sheet steels are described together with the future direction of research.
ISSN:1042-6914
1532-2475
DOI:10.1080/10426910903202195