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。
High strain isothermal compression tests were carried out in Gleeble 1500 to study high temperature deformation behavior of 23Co13Ni11Cr3Mo ultrahigh strength steel. The results show that flow stress decreases with temperature increasing, while increases with strain rate increasing. DRX softening played an important role at high temperature and low strain rate. Flow stress decreased about 29.6% from peak stress at 1000oC and 0.001 s−1. The 23Co13Ni11Cr3Mo ultrahigh strength steel is suit to forge at 1000–1100 ! and strain rate 0.01–1 s−1. At these deformation conditions, sufficiect DRX occurred, grain size was small and changed little with temperature or strain rate increasing. Moreover, based on the experiment results, peak stress and steady grain size model were estalblished. The predicted values of this model agreed well with the experiment values.
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