(西北工业大学 材料科学与工程学院， 西安710072)
摘 要: 采用Thermecmastor-Z型热加工模拟试验机对GH4169合金热态变形过程中（温度范围为960～1020℃， 应变速率范围为10-2～50s-1， 等效应变范围为0.357～0.916和变形后高温滞留阶段内（滞留时间为0～15s）的显微组织演化过程进行了实验研究， 定量地测定了试样内的动态再结晶晶粒尺寸和再结晶体积分数。 根据实验结果， 指出了GH4169合金热加工过程中的主要显微组织演化过程是动态和亚动态再结晶， 确定了峰值应力和峰值应变与锻造热力参数间的关系， 建立了动态再结晶和亚动态再结晶过程的运动学方程和晶粒尺寸演化模型，从而为预测和控制GH4169合金锻件的组织性能提供了依据。
关键字: GH4169合金； 显微组织演化模型； 动态再结晶； 亚动态再结晶
hot working process
（College of Materials Science and Technology,
Northwestern Polytechnical University, Xi′an 7l0072, China）
Abstract:The microstructure evolution processes of GH4169 alloy during hot deformation and dwelling period after deformation were studied using Thermecmastor-Z hot working simulator, at temperature from 960℃ to 1020℃, equivalent strain rate from 10-2s-1 to 50s-1, true strain from 0.357 to 0.916, and dwelling time from 0s to 15s. It is found that the dominant microstructure evolution processes are dynamic recrystallization and metadynamic recrystallization. The microstructure evolution models including kinetics and grain sizes of dynamic and metadynamic recrystallizations are established in order to predict microstructure and grain size of GH4l69 alloy forgings.
Key words: GH4l69 alloy; microstructure evolution model; dynamic recrystallization; metadynamic recrystallization
