The true stress–true strain curves of 25Cr2Ni4MoVA steel were obtained by uniaxial compression experiments at 850–1200 °C in the strain rate range of 0.001–10.0 s⁻¹. And the dynamic continuous cooling transformation curves were obtained at the cooling rate range of 0.5–15.0 °C s⁻¹ from the austenitization temperature of 1000 °C to the room temperature by pre-strain of 0.2 as well. The power dissipation map and the dynamic continuous cooling transformation diagram were constructed based on the data provided by these curves. Compared with the optical micrographs of the compressed samples, the full dynamic recrystallization region is located between 1000 and 1200 °C and at the strain rate range from 0.01 to 10.0 s⁻¹ with the power dissipation efficiency not less than 0.33. In the full dynamic recrystallization region, the power dissipation efficiency increases and the dynamic recrystallization activation energy decreases with the temperature increasing. With the strain rate decreasing, the power dissipation efficiency increases firstly and then starts to decrease as the strain rate is less than 0.1 s⁻¹, and dynamic recrystallization activation energy changes on the contrary. According to the dynamic continuous cooling transformation diagram, slow cooling is a better way for the hot-deformed piece with large size or complex shape to avoid cracking as the temperature of the piece is lower than 400 °C, and different cooling ways can be used for the hot-deformed piece with small size and simple shapes to obtain certain microstructure and meet good compressive properties.

25Cr2Ni4MoVA钢的真实应力-真实应变曲线是通过在850–1200°C下在0.001–10.0 s ^-1的应变速率范围内进行单轴压缩实验获得的。并且在从0.1的奥氏体化温度到1000的奥氏体化温度到室温的0.5-15.0°C s ^-1的冷却速率范围内，也获得了动态连续冷却转变曲线，并且也经过了0.2的预应变。基于这些曲线提供的数据，构建了功率消耗图和动态连续冷却变换图。与压缩样品的光学显微照片相比，整个动态再结晶区域位于1000至1200°C之间，应变速率范围为0.01至10.0 s ^-1功耗效率不小于0.33。在整个动态再结晶区域中，随着温度的升高，功率消耗效率增加，动态再结晶活化能降低。随着应变率的降低，功率消耗效率首先增加，然后在应变率小于0.1 s ^-1时开始降低，动态再结晶活化能发生相反的变化。根据动态连续冷却转变图，对于大尺寸或形状复杂的热变形件，当其温度低于400°C时，缓慢冷却是避免开裂的更好方法，可以使用不同的冷却方式用于小尺寸和简单形状的热变形件，以获得一定的微观结构并满足良好的压缩性能。