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采用Gleeble-3800热模拟机对新型镍基高温合金GH4700在变形温度1 120～1 170℃,应变速率0.01～1 s-1下的热变形行为和组织演变进行了研究,建立了合金的热变形本构模型。结果表明:合金的流变应力随着应变速率的减小和变形温度的升高而降低,曲线表现出动态再结晶特征;采用考虑应变量的双曲正弦模型能较好地反映合金在热变形过程中流变应力的变化规律;GH4700合金在热压缩变形过程中,降低应变速率和提高变形温度均有利于动态再结晶的发生。
The hot deformation behavior and microstructure evolution of the GH4700 superalloy GH4700 under the deformation temperature of 120-1 170 ℃ and the strain rate of 0.01-1 s-1 were studied by Gleeble-3800 thermal simulator. The thermal deformation Constitutive model. The results show that the flow stress decreases with the decrease of strain rate and deformation temperature, and the curve shows the dynamic recrystallization characteristics. The hyperbolic sine model considering the strain can better reflect the thermal deformation of the alloy The process of flow stress changes; GH4700 alloy in the hot compression deformation process, to reduce the strain rate and increase the deformation temperature are conducive to the occurrence of dynamic recrystallization.