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采用Gleeble-1500D热模拟实验机对70Cr3Mo钢进行热模拟压缩实验,变形温度为850~1150℃,应变速率为0.01~10 s-1,用加工硬化率的方法处理实验数据,再结合lnθ-ε曲线的拐点及-(lnθ)/ε-ε曲线最小值判据,建立70Cr3Mo钢热变形过程中的动态再结晶临界应变模型。研究结果表明:实验条件下,70Cr3Mo钢的lnθ-ε曲线均具有拐点特征,对应的-(lnθ)/ε-ε曲线均出现最小值,该最小值所对应的应变即为临界应变;临界应变随变形温度的降低和应变速率的增加而增大;临界应变预测模型可表示为εc=5.4446×10-2Z0.01878。
The thermal simulation of 70Cr3Mo steel was carried out by using Gleeble-1500D thermal simulation machine. The deformation temperature was 850-1150 ℃ and the strain rate was 0.01-10 s-1. The experimental data were processed by work-hardening method. Combined with lnθ-ε The inflection point of the curve and the minimum criterion of- (lnθ) / ε-ε curve to establish the dynamic recrystallization critical strain model in the hot deformation of 70Cr3Mo steel. The results show that the lnθ-ε curves of 70Cr3Mo steel have the inflection point characteristics under the experimental conditions, and the corresponding minimum values of -n (lnθ) / ε-ε curves appear, and the strain corresponding to the minimum is the critical strain. The critical strain increases with the decrease of deformation temperature and the increase of strain rate. The critical strain prediction model can be expressed as εc = 5.4446 × 10-2Z0.01878.