The deformation mechanism and constitutive equation of Ti-Mo steel in the mushy zone were investigated through high-temperature compression deformation. Nonlinear fitting and polynomial fitting were used to build a precise constitutive model. The law of microstructure evolution was also researched. During the deformation of Ti-Mo steel in the mushy zone, the liquid phase was squeezed to the edge, and macro separation between the solid and liquid occurred after deformation. The extent of dynamic crystallization in Ti-Mo steel increased with increasing strain rate, which is quite different from the dynamic recrystallization occurring during deformation in the solid region. The critical condition for dynamic recrystallization decreased and the grain refinement degree increased due to the return temperature effect of the liquid between solid particles. The prediction accuracy of the modified Fields–Backofen (FB) model with a liquid-phase adjustment factor was compared with that of the Arrhenius model with a liquid-phase adjustment factor. The results showed that the modified FB model had low prediction accuracy. The Arrhenius model with a liquid-phase adjustment factor was revised according to different strain rates. The revised model had higher prediction accuracy and was suitable for describing the metal rheology in the mushy zone of Ti-Mo steel, with accuracy of approximately 90 pct.

通过高温压缩变形研究了Ti-Mo钢在糊状区的变形机理和本构方程。非线性拟合和多项式拟合用于建立精确的本构模型。还研究了微结构演化的规律。Ti-Mo钢在糊状区变形期间，液相被挤压到边缘，变形后发生固相和液相之间的宏观分离。Ti-Mo钢的动态结晶程度随应变速率的增加而增加，这与固态区域变形过程中发生的动态再结晶有很大的不同。由于固体颗粒之间的液体返回温度效应，动态再结晶的临界条件降低，晶粒细化度提高。将改进的具有液相调节因子的Fields-Backofen（FB）模型的预测精度与具有液相调节因子的Arrhenius模型的预测精度进行了比较。结果表明，改进的FB模型的预测精度较低。根据不同的应变率修改了具有液相调节因子的Arrhenius模型。修改后的模型具有更高的预测精度，适用于描述Ti-Mo钢糊状区中的金属流变学，精度约为90 pct。根据不同的应变率修改了具有液相调节因子的Arrhenius模型。修改后的模型具有更高的预测精度，适用于描述Ti-Mo钢糊状区中的金属流变学，精度约为90 pct。根据不同的应变率修改了具有液相调节因子的Arrhenius模型。修改后的模型具有更高的预测精度，适用于描述Ti-Mo钢糊状区中的金属流变学，精度约为90 pct。