Journal of Northeastern University Natural Science ›› 2016, Vol. 37 ›› Issue (5): 642-646.DOI: 10.12068/j.issn.1005-3026.2016.05.008

• Materials & Metallurgy • Previous Articles     Next Articles

Modeling the Effect of Nb on Austenite→Ferrite Phase Transformation Kinetics

LIU Xue-feng1, JIA Tao1, ZHU Ben-qiang2   

  1. 1. State Key Laboratory of Rolling and Automation, Northeastern University, Shenyang 110819, China; 2. The Centre for Metallurgical Process Engineering, The University of British Columbia, Vancouver V6T 1Z4, Canada.
  • Received:2015-03-17 Revised:2015-03-17 Online:2016-05-15 Published:2016-05-13
  • Contact: JIA Tao
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Abstract: In thermal simulation tests, the austenite with the same grain size but different solute Nb% was obtained by holding at austenite region with various times. The dilation curve was recorded when the sample was cooled to room temperature with the cooling rate of 1~5K/s. Originating from Rios’ theoretical deduction, a modeling approach based on the JMAK(Johnson-Mehl-Avrami-Kolmogorov) equation and additivity rule was developed. The kinetic model of austenite to ferrite phase transformation under different solute Nb% was established. The results suggest that the exponential n is not affected by the solute Nb%, whereas the kinetic parameter k decreases with increasing solute Nb% that is an enhanced solute drag effect.

Key words: phase transformation, kinetic model, Nb, JMAK(Johnson-Mehl-Avrami-Kolmogorov), additivity rule

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