Kinetics of bainite-to-austenite transformation during continuous reheating in low carbon microalloyed steel
来源期刊：International Journal of Minerals Metallurgy and Materials2013年第5期
论文作者：Ming Chang Hao Yu
文章页码：427 - 432
摘 要：A dilatometer was used to study the kinetics of bainite-to-austenite transformation in low carbon microalloyed steel with the initial microstructure of bainite during the continuous reheating process. The bainite-to-austenite transformation was observed to take place in two steps at low heating rate. The first step is the dissolution of bainite, and the second one is the remaining bainite-to-austenite transformation controlled by a dissolution process. The calculation result of the kinetics of austenite formation shows that the two steps occur by diffusion at low heating rate. However, at high heating rate the bainite-to-austenite transformation occurs in a single step, and the process is mainly dominated by shear. The growth rate of austenite reaches the maximum at about 835 C at different heating rates and the growth rate of austenite as a function of temperature increases with the increase in heating rate.
Ming Chang，Hao Yu
School of Materials Science and Engineering,University of Science and Technology Beijing
摘 要：A dilatometer was used to study the kinetics of bainite-to-austenite transformation in low carbon microalloyed steel with the initial microstructure of bainite during the continuous reheating process. The bainite-to-austenite transformation was observed to take place in two steps at low heating rate. The first step is the dissolution of bainite, and the second one is the remaining bainite-to-austenite transformation controlled by a dissolution process. The calculation result of the kinetics of austenite formation shows that the two steps occur by diffusion at low heating rate. However, at high heating rate the bainite-to-austenite transformation occurs in a single step, and the process is mainly dominated by shear. The growth rate of austenite reaches the maximum at about 835 C at different heating rates and the growth rate of austenite as a function of temperature increases with the increase in heating rate.
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