The hot deformation behavior of Zr-4 alloy at the deformation temperature range of 750–1000 °C and the strain rate range of 0.001–10 s⁻¹ was studied on a Gleeble-3500 thermal simulator. The results show that the flow stress increases with the increasing strain rates or the decreasing deformation temperature. Based on the experimental data, the strain-compensated constitutive equation was established to predict flow stress during different strains, strain rates and temperatures. Meanwhile, the hot deformation activation energy of Zr-4 alloy was respectively calculated to be 224.31 kJ/mol, 593.50 kJ/mol and 345.71 kJ/mol in α single-phase region, α+β two-phase region and β single-phase region, which are obviously much higher than the activation energy of pure zirconium (113 kJ/mol). It indicates that the main deformation mechanism is not the dynamic recovery but other deformation mechanisms. According to the dynamic material model and Murty instability criterion, Murty processing maps have been constructed at the true strain of 0.6 and 1.2. Moreover, by combining microstructural observations, the areas of 750–880 °C/0.01–0.32 s⁻¹ and 900–1000 °C/0.03–1 s⁻¹ are identified to be the optimum hot working parameters.

在Gleeble-3500热模拟机上研究了Zr-4合金在750–1000°C的变形温度范围和0.001–10 s ^-1的应变速率范围内的热变形行为。结果表明，流动应力随着应变率的增加或变形温度的降低而增加。基于实验数据，建立了应变补偿本构方程，以预测不同应变，应变速率和温度下的流动应力。同时，Zr-4合金在α单相区，α + β两相区和β中的热变形活化能分别计算为224.31 kJ / mol，593.50 kJ / mol和345.71 kJ / mol。单相区，明显高于纯锆的活化能（113 kJ / mol）。这表明主要的变形机制不是动态恢复，而是其他变形机制。根据动态材料模型和Murty不稳定性准则，在真实应变为0.6和1.2的情况下构造了Murty处理图。此外，通过结合微观结构观察，可以确定750-880°C / 0.01-0.32 s ^-1和900-1000°C / 0.03-1s ^-1的区域是最佳的热加工参数。