Isothermal compression tests of as-forged 30Si2MnCrMoVE low-alloying ultra-high-strength steel were carried out on a Gleeble 3500 thermal simulator at the deformation temperatures of 950–1150 °C and strain rates of 0.01–10 s⁻¹. Based on the classical stress–dislocation density relationship and the kinematics of the dynamic recrystallization, the constitutive equations of the work hardening dynamical recovery period and dynamical recrystallization period were developed by using the work hardening curve and Avrami equation, which shows good agreement with the experimental value. Processing maps at the strain of 0.90 were constructed based on dynamic material model and were analyzed combined with microstructure observation under different conditions. The optimum parameter based on the processing maps was obtained and verified by a supplementary experiment. The power dissipation maps and instability maps at strains of 0.05–0.90 were also constructed, and the evolution law was analyzed in detail. The established constitutive equation and hot processing maps can provide some guidance for hot working process.

锻造的30Si2MnCrMoVE低合金超高强度钢的等温压缩试验在Gleeble 3500热力模拟器上进行，变形温度为950-1150°C，应变速率为0.01-10 s ^-1。在经典应力-位错密度关系和动态再结晶运动学的基础上，利用工作硬化曲线和Avrami方程建立了工作硬化动态恢复期和动态再结晶阶段的本构方程，与实验结果吻合良好。值。基于动态材料模型构建了0.90应变的加工图，并结合不同条件下的显微组织进行了分析。获得了基于加工图的最佳参数，并通过补充实验进行了验证。还建立了在0.05-0.90应变下的功率耗散图和不稳定性图，并详细分析了其演化规律。