(西北工業(yè)大學(xué) 材料科學(xué)與工程學(xué)院， 西安710072)
摘 要: 采用Thermecmastor-Z型熱加工模擬試驗機對GH4169合金熱態(tài)變形過程中（溫度范圍為960～1020℃， 應(yīng)變速率范圍為10-2～50s-1， 等效應(yīng)變范圍為0.357～0.916和變形后高溫滯留階段內(nèi)（滯留時間為0～15s）的顯微組織演化過程進行了實驗研究， 定量地測定了試樣內(nèi)的動態(tài)再結(jié)晶晶粒尺寸和再結(jié)晶體積分數(shù)。 根據(jù)實驗結(jié)果， 指出了GH4169合金熱加工過程中的主要顯微組織演化過程是動態(tài)和亞動態(tài)再結(jié)晶， 確定了峰值應(yīng)力和峰值應(yīng)變與鍛造熱力參數(shù)間的關(guān)系， 建立了動態(tài)再結(jié)晶和亞動態(tài)再結(jié)晶過程的運動學(xué)方程和晶粒尺寸演化模型，從而為預(yù)測和控制GH4169合金鍛件的組織性能提供了依據(jù)。
關(guān)鍵字: GH4169合金； 顯微組織演化模型； 動態(tài)再結(jié)晶； 亞動態(tài)再結(jié)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
