Abstract: Hot compression deformation of steel 34CrMo4H with strain rate 0.1 ~ 10 s^-1 at 800 ~ 1200 ℃ has been tested and studied by using Gleeble-3800 thermo-mechanical simulator to analyze in hot deformation of this steel. The relationships between flow stress and strain rate, as well as flow stress and deformation temperature were studied. Results show that the flow stress increases with the increase of strain rates and decreases with the increase of temperature, and as the strain rate is 0. 1 s^-1, the feature of dynamic recrystallization occurs obviously on flow stress curves of steel. The hot deform activation energy of steel 34CrMo4H is 395.45 kJ/mol.

摘要： 采用Gleeble-3800型热模拟机试验研究了34CrMo4H钢在900～1200℃、应变速率0.1～10s^-1时的高温热压缩行为,分析了热压缩变形时材料的流变应力与变形温度、应变速率之间的关系,确定了该钢的流变应力本构方程。结果表明,34CrMo4H钢在热压缩时流变应力随形变温度的升高而减小,随应变速率的增加而增大。应变速率小于0.1 s^-1时,该钢应力-应变曲线表现出明显的动态再结晶特征。34CrMo4H级钢的变形激活能为395.45kJ/mol。