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| Kinetics model of non-isothermal austenite phase transformation for hot stamping boron steel |
| LI Xue-tao1,2，JIANG She-ming1，ZHANG Qi-fu1 ，TENG Hua-xiang2，ZHAO Hai-feng2，HUANG Ming-dong3 |
（1. National Engineering Laboratory Advanced Coating Technology for Metals， Central Iron and Steel Research Institute， Beijing 100081， China
2. Thin Strip Department， Shougang Research Institute of Technology， Beijing 100043， China
3. School of Mechanical Engineering， University of Science and Technology Beijing， Beijing 100083， China） |
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Abstract The austenite transformation kinetics curves of hot stamping boron steel were investigated by thermal expansion testing on a Gleeble-3500 thermal-mechanical simulator under different heating rates. The effect of heating rate on the austenite formation was investigated. Results show that the austenite formation start temperature rises with heating rate increasing， to achieve the same volume fraction of austenite， and less time is required at a higher heating rate. When the heating temperature is between[Ac1]and[Ac3，]transformation rate of austenite percentage with the heating temperature rising will first increase then decrease. A unified kinetics model of the non-isothermal austenitization considering the influence of heating rate， based on the theory of austenite nucleation and growth， was established. Material constants in the kinetics model were determined and optimized through a genetic algorithm in Matlab. The model can describe the austenite transformation kinetics curves of boron steel and accurately predict the fraction of the austenite under different heating rates.
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Received: 19 December 2016
Published: 28 July 2017
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2017, Vol. 52 
