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Characterization of Kinetics of Deformation-Enhanced Transformation in a Low Carbon Steel

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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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Periodical:

Materials Science Forum (Volumes 475-479)

Pages:

73-76

DOI:

https://doi.org/10.4028/www.scientific.net/MSF.475-479.73

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Online since:

January 2005

Authors:

Jun Jie Qi, Wang Yue Yang, Zu Qing Sun, X. Zhang

Keywords:

Deformation Enhanced Transformation, Kinetic, Low Carbon Steel

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© 2005 Trans Tech Publications Ltd. All Rights Reserved

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