Paper Title:
Modelling the Deformation and Annealing Processes: Physical and Regression Approaches
  Abstract

The flow stress behaviour of ferrite under abruptly reduced strain rate has been modelled by employing the relatively simple approach of the Bergström’s model for plastic deformation of metals. This physical model considers the rate of change of dislocation density as a difference of the rate of dislocation immobilisation and remobilization, estimated as a function of a recovery parameter. The concept of average rest time of immobilized dislocations prior to remobilization has been suitably employed to estimate the transient times and the enhancement of recovery rates after the strain rate change. The transient friction stress was estimated by using equations given in the literature and some mathematical factors concerning the estimated dislocation densities and the net rates of dislocation immobilization at the high and low strain rates. The present authors have also developed a new unique regression model that is able to predict the static recrystallisation kinetics of most of the common carbon steel grades (including microalloyed steels). A linear regression equation was established to predict the activation energy of static recrystallisation for hot-worked austenite as sum effects of potent solute elements. Further, the power of grain size in the equation was found to be a strong grain-size dependent variable. The model was later validated for several special steel grades, as well as including the consideration for an upper limit for Nb and Si in retarding recrystallisation.

  Info
Periodical
Edited by
P. B. Prangnell and P. S. Bate
Pages
583-588
DOI
10.4028/www.scientific.net/MSF.550.583
Citation
M. C. Somani, L. P. Karjalainen, "Modelling the Deformation and Annealing Processes: Physical and Regression Approaches", Materials Science Forum, Vol. 550, pp. 583-588, 2007
Online since
July 2007
Export
Price
$32.00
Share

In order to see related information, you need to Login.

In order to see related information, you need to Login.

Authors: Zhi Guo Chen, Zi Qiao Zheng, Dong Feng Han
Abstract:The hot deformation behaviors and microstructure in Al-Cu-Li alloy containing small amount of Ag and Mg were investigated by transmission...
1925
Authors: Jean Louis Uriarte, A. Perlade, X. Lemoine, M. Soler, V. Ballarin, Thierry Iung
Abstract:Arcelor produces « Bake-Hardening » steels for automotive outer panels, which present the advantages of a remarkable drawability combined...
4232
Authors: Mei Juan Hu, Peng Wang, Li Hong Han, Xin Li Han
Abstract:The dynamic mechanical behaviors of as-cast sour service drill pipe steel under development during hot deformation were studied in this paper...
266
Authors: Jai Gautam, Alexis G. Miroux, J. Moerman, Carla Barbatti, Peter van Liempt, Leo Kestens
Chapter 22: Thermomechanical Processing - Prof J. Jonas Symposium
Abstract:In the present study non-recrystallisation (Tnr) and Ar3 temperatures have been determined for the C-Mn steels from multi-pass hot torsion...
2722
Authors: Di Tang, Yao Wen Xu, Yong Song, Lei Wang
Chapter 1: Material Engineering and Technology
Abstract:The main purpose of this study is to develop a numerical model to describe the static recrystallization kinetics in X70 pipeline steel. In...
3