关键词: 9Cr3W3Co, 本构方程, 3D热加工图, 动态再结晶

Abstract: A single pass hot deformation experiment was carried out on 9Cr3W3Co alloy by using Gleeble-3800 thermal simulator at the temperature of 950-1150 ℃， the strain rate of 0.1-10 s^-1and the deformation of 70.9%. In order to better simulate the on-site process， the multi pass deformation process simulation simulation was carried out by using the scheme of the pass deformation from large to small and the pass deformation from small to large. The strain rate was 5.0 s^-1,and the total deformation amount was 70.9%. The deformation characteristics of dynamic recrystallization behavior of 9Cr3W3Co alloy used for steam turbine blades were studied， the stress-strain curve of the alloy was obtained， and the dynamic material model is used to construct the 3 D thermal processing diagram of the alloy under different deformation conditions. The results indicate that the stress-strain curve of 9Cr3W3Co alloy shows that the stress decreases with the increase of deformation temperature and increases with the increase of strain rate. In order to accurately describe the relationship between the three， the hyperbolic sine constitutive equation is established， and finally its thermal activation energy is 655.051 kJ/mol. Combined with the analysis of the results of microstructure evolution， it is concluded that the best hot working area of the alloy should be： deformation temperature 1050-1150 ℃， strain rate 0.1-1 s^-1. In the process of rapid forging deformation， the forging process of first large deformation and then small deformation is conducive to obtaining uniform grain size

Key words: 9Cr3W3Co, Constitutive Equation, 3D Thermal Processing Diagram, Dynamic Recrystallization