J Mater Sci Technol ›› 2009, Vol. 25 ›› Issue (05): 615-618.

• Articles • Previous Articles     Next Articles

Isothermal Growth Kinetics of Ultra-fine Austenite Grains in a Nb-V-Ti Microalloyed Steel

Shengjie Yao, Linxiu Du, Xianghua Liu, Guodong Wang   

  1. State Key Lab. of Rolling and Automation, Northeastern University, Shenyang 110004, China
  • Received:2008-07-01 Online:2009-09-28 Published:2009-10-10
  • Contact: Sheng-Jie YAO
  • Supported by:

    the National Natural Science Foundation of China (No. 50527402)

Abstract:

Ultra-fine austenite grains with size of 1~3 μm were prepared in a Nb-V-Ti steel through repetitive treatment of rapid heating and quenching. A model for the growth kinetics of these ultra-fine austenite grains was successfully created through successive 2 processes, and the activation energy Q for growth was estimated to be about 693.2 kJ/mol, which directly shows the inhibition effect of microalloy elements on the growth of ultra-fine austenite grains.

Key words: Ultra-fine austenite grain, Grain growth kinetics, Microalloyed steel