Characterization of Kinetics of Deformation-Enhanced Transformation in a Low Carbon Steel |
| Journal |
Materials Science Forum (Volumes 475 - 479) |
| Volume |
PRICM-5 |
| Edited by |
Z.Y. Zhong, H. Saka, T.H. Kim, E.A. Holm, Y.F. Han and X.S. Xie |
| Pages |
73-76 |
| DOI |
10.4028/www.scientific.net/MSF.475-479.73 |
| Online since |
January, 2005 |
| Authors |
Jun Jie Qi,
Wang Yue Yang,
Zu Qing Sun,
X. Zhang
|
| Keywords |
Deformation Enhanced Transformation, Kinetic, Low Carbon Steel |
| Abstract |
Quantitative characterization of microstructural development during deformation
enhanced transformation in a low carbon steel was investigated on a Gleeble 1500 machine. General conclusions of the features of austenite transformation kinetics during deformation-enhanced transformation were formulated. It was shown that the process of deformation-enhanced transformation can be divided into three stages according to the characteristics of transformation kinetics: The kinetics equations of two early stages fitted well in J-M-A equation. The kinetics of the first stage obeys Cahn’s site saturation mechanism, with the value of kinetics parameter n of 4. Ferrite nucleates at austenite grain boundaries and triple points during the first stage. Kinetics of the second stage doesn’t obey Cahn’s theory, with the value of kinetics parameter n of 1-1.5, corresponding to ferrite nucleation repeatedly at areas with high stored energy in front of the ferrite/austenite interface. The kinetics doesn’t obey the law of J-M-A equation any more in the final stage, and only few
nucleation sites left at this moment. |
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