Dynamic recrystallization behavior of 35CrMo structural steel

来源期刊：中南大学学报(英文版)2003年第1期

论文作者：张斌 张鸿冰 阮雪榆

文章页码：13 - 19

Key words：dynamic recrystallization;θ-ε curve; recrystallizaiton kinetics; initial grain size

Abstract: The dynamic recrystallization behavior of 35CrMo steel was studied with compression test in the temperature range of 1 223-1 423 K and the strain rate range of 0.01-10.00 s^-1. The initiation and evolution of dynamic recrystallization were investigated with microstructure analysis and then the critical strainεcfor dynamic recrystallization initiation, the strain for maximum softening rateε*and the steady strainεswere obtained to be 2.92×10^-3Z0.1381, 1.60×10^-3Z0.178 0and 3.26×10^-2×Z0.097 2respectively by analysis of work-hardening rate-strainθ-εcurves, where Z is the Zener-Hol-lomon parameter. The dynamic recrystallization fraction was determined using recrystallization theory,and the effects of initial grain size, strain rate and deformated temperature on the dynamic recrystal- lization kinetics were investigated. The results show:XDRX=1-exp(-3.23(ε-ε_c/ε_s-ε_c)2.28), the dynamic recrystallization fraction is slightly delayed due to the somewhat larger initial grain size and markedly delayed with the decrease of temperature. On the other hand, it is significantly accelerated with the increase of the strain rate. Finally, the relationships between the initiation time, ending time of dynamic recrystallization and the deformed temperature were analyzed in detail.