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

摘要

Ultra-fine austenite grains with size of 1～3μm 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.