Abstract: The two-pass hot compressed test for 15 mm plate forged from 50 mm cast slab of spring steel 50CrV4 (/% : 0.53C, 0.18Si, 0. 84Mn, 0.012P, 0. 003S, 0. 92Cr, 0. 12V, 0.02Ti) has been carried out by using Gleeble-1500 thermo-simulation machine. The behavior of static recrystallization of steel during deformation at 850 ~ 1000 ℃ with true strain 0. 1 ~ 0. 25, strain rate 0. 1 ~ 10 s^-1 and inter-pass cooling for 1 ~ 80 s is studied and a static recrystallization kinetics model is established. Results show that with increasing temperature, strain, strain rate and inter-pass cooling time the static recrystallizing course of steel 50CrV4 shall be improved ； at 950 ℃ with true strain 0. 25, as strain rate is 0. 1, 1 and 10 s^-1 the time to occur 50% recrystallization grains in steel is respectively 8. 42, 4. 40 and 2.22 s； the activation energy for static recrystallization of steel is 249. 974 kJ· mol^-1.

摘要： 通过Gleeble-1500热模拟机对50CrV4弹簧钢（/%:0.53C,0.18Si,0.84Mn,0.012P,0.003S,0.92Cr,0.12V,0.02Ti）50 mm连铸板坯锻制成的15 mm板进行双道次热压缩试验。研究该钢在850~1000℃以真应变0.1~0.25,应变速率0.1~10 s^-1,道次间隔1~80 s形变时的静态再结晶行为,并建立了静态再结晶动力学模型。结果表明,随温度、应变量、应变速率、道次间隔时间增加,会加速50CrV4钢静态再结晶进程;在950℃,真应变0.25,应变速率为0.1,1,10 s^-1时,该钢发生50%再结晶所需的时间分别为8.42,4.40,2.22 s;该钢静态再结晶激活能为249.974 kJ·mol^-1。

关键词: 50CrV4弹簧钢, 50 mm连铸板坯, 双道次热压缩, 静态再结晶, 动力学模型