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首页> 外文期刊>ISIJ international >Dynamic Recrystallization Behavior of Vanadium Micro-alloyed Forging Medium Carbon Steel
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Dynamic Recrystallization Behavior of Vanadium Micro-alloyed Forging Medium Carbon Steel

机译：钒微合金锻造中碳钢的动态再结晶行为

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摘要

The dynamical recrystallization of Micro-alloyed forging steel was investigated at deformation temperatures of 850-1 150℃ and strain rates of 0.01-5 s~(-1) on a Gleeble-1500 dynamic thermo-mechanical simulator. The stress-strain curves at lower strain rates are typical of the occurrence of DRX and exhibit a peak in the flow stress before reaching steady state. The critical strain for the initiation of DRX has been estimated through the analysis of stress-strain curves and the result showed that the critical strain was correlated to the peak strain by ε_c = 0.68ε_p. Utilizing the peak stresses σ_p measured from the stress-strain curves, constitutive equation governing the dynamic recrystallization has been analyzed and activation energy was determined to be Q = 379 kJ/mole, which was significantly, larger than that of same composition of V-micro alloyed steel. The grain size was refined from 140μm to 8-60μm by DRX. The dynamically recrystallized grain size has been measured and the result showed that logarithm of grain size appeared to be linearly decreasing with the increase in the logarithm of Zener-Holloman parameter Z = ε-exp(Q/RT). However, when the logarithm of grain size was plotted in terms of the inverse of deformation temperature, i.e. 1/T, the plot showed a significant deviation from the linearity expected from the above linear relationship.
机译：在Gleeble-1500动态热力模拟机上研究了微合金锻钢在850-1 150℃的变形温度和0.01-5 s〜（-1）的应变速率下的动态再结晶。较低应变速率下的应力-应变曲线是DRX发生的典型现象，并在达到稳态之前出现了流动应力的峰值。通过对应力-应变曲线的分析，估计了引发DRX的临界应变，结果表明临界应变与峰值应变相关，ε_c=0.68ε_p。利用从应力-应变曲线测得的峰值应力σ_p，分析了控制动态再结晶的本构方程，确定活化能为Q = 379 kJ / mol，显着大于相同体积的V-micro合金钢。通过DRX将晶粒尺寸从140μm细化至8-60μm。测量了动态再结晶的晶粒尺寸，结果表明，随着Zener-Holloman参数Z =ε-exp（Q / RT）的对数的增加，晶粒的对数似乎呈线性减小。然而，当以变形温度的倒数，即1 / T来绘制晶粒尺寸的对数时，该图显示出与上述线性关系所期望的线性之间的显着偏差。

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