Single-pass compression tests were performed to investigate the hot deformation behavior of low-carbon boron microalloyed steel containing three various vanadium contents at 900–1100 °C and strain rate of 0.01–10 s⁻¹ using the MMS-300 thermal mechanical simulator. The flow stress curves of investigated steels were obtained under the different deformation conditions, and the effects of the deformation temperature and strain rate on the flow stress were discussed. The characteristic points of flow stress were obtained from the stress dependence of strain hardening rate; the activation energy of investigated steels was determined by the regression analysis; the flow stress constitutive equations were developed; the effect of vanadium content on the flow stress and dynamic recrystallization (DRX) was investigated. The result showed that the flow stress and activation energy (316.5 kJ mol⁻¹) of the steel containing 0.18 wt% V were significantly higher than those of the steels with 0.042 wt% and 0.086 wt% V, which was related to the increase in solute drag and precipitation effects for higher vanadium content. DRX analysis showed that the addition of vanadium can delay the initiation and the rate of DRX.

中文翻译：

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钒含量对低碳硼微合金钢热变形行为的影响

进行单次通过压缩试验以研究含三种不同钒含量的低碳硼微合金钢在900–1100°C和应变速率为0.01–10 s ^-1时的热变形行为。使用MMS-300热机械模拟器。获得了在不同变形条件下所研究钢材的流变应力曲线，并讨论了变形温度和应变速率对流变应力的影响。由应变硬化率的应力依赖性得到了流变应力的特征点。通过回归分析确定所研究钢材的活化能。建立了流动应力本构方程。研究了钒含量对流动应力和动态重结晶（DRX）的影响。结果表明，流变应力和活化能（316.5 kJ mol ^-1含0.18wt％的V的钢的α）明显高于含0.042wt％和0.086wt％的V的钢，这与较高钒含量的溶质阻力和沉淀作用的增加有关。DRX分析表明，钒的添加可以延迟DRX的引发和速率。