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在Gleeble 1500热模拟机上进行大变形等温压缩实验,研究了23Co13Ni11Cr3Mo钢的高温变形行为。结果表明:流变应力随着变形温度的降低和应变速率的升高而增大,在高温、低应变速率下动态再结晶软化效应显著,在温度为1000℃、应变速率为0.001 s~(-1)时流变应力下降29.6%。23Co13Ni11Cr3Mo钢在温度为1000-1100℃、应变速率为0.01-1 s~(-1)范围内锻造,其动态再结晶充分发生,晶粒细小,随变形参数波动变化平缓。根据实验结果建立了峰值流变应力模型及稳态晶粒尺寸模型,其预测值与实验值吻合得比较好。
Large deformation isothermal compression experiments were carried out on a Gleeble 1500 thermal simulator to study the high temperature deformation behavior of 23Co13Ni11Cr3Mo steel. The results show that the flow stress increases with the decrease of the deformation temperature and the strain rate. Under the condition of high temperature and low strain rate, the dynamic recrystallization softening effect is remarkable. At the temperature of 1000 ℃, the strain rate is 0.001 s ~ (- 1) flow stress decreased 29.6%. 23Co13Ni11Cr3Mo steel was forged at a temperature of 1000-1100 ℃ and a strain rate of 0.01-1 s ~ (-1). The dynamic recrystallization took place sufficiently and the grains were small and the variation with the deformation parameters was gentle. Based on the experimental results, the peak flow stress model and the steady-state grain size model are established. The predicted values are in good agreement with the experimental values.