【摘要】 在变形温度900～1100℃,应变速率0.01～5 s-1条件下对GH4169高温合金进行热压缩试验,研究了其显微组织及热变形行为。基于流变曲线构建了双曲正弦型Arrhenius本构方程,通过Avrami方程构建了临界动态再结晶模型。结果表明:GH4169高温合金在热压缩过程中发生了动态再结晶,且高温、低应变速率下的再结晶行为更显著;热压缩至应变量为0.2时,GH4169高温合金的本构方程为ε·=1.37×10¹⁸[sinh（0.003 1σ）]^6.13exp（-4.63×10⁵/RT）;动态再结晶临界值和峰值之间存在线性关系,1 100℃,0.01 s^-1变形条件下的Avrami再结晶模型为X_DRX=1-exp{-0.049[（ε-0.0355）/0.089 9]^2.132}。更多还原

【Abstract】 GH4169 superalloy was subjected to thermal compression test at deformation temperature of 900-1100 ℃ and strain rateof 0.01-5 s-1, and the microstructure and hot deformation behaviour were studied. A hyperbo lic sinusoidal Arrhenius constitutive equation was constructed on the basis of flow curves and a Avrami criticald ynamic recrystallization model was constructed. The results show that GH4169 superalloy underwent dynamicr ecrystallization during hot compression process, and the recrystallization behaviour was more significant at relativelyhigh temperatures and low strain rates. The constitutive equation of GH4169 superalloy was ε·=1.37×10¹8[s inh（0.003 1σ）]^6.13 exp（-4.63×10⁵/RT） when the thermal compression strain reached 0.2. There was a linearrelationship between the dynamic recrystallizationcritical values and the peak values. The Avrami re crystallization model was X_DRX=1-exp{-0.049[（ε-0.035 5）/0.089 9]2.132} at deformation temperature of 1100 ℃ and strain rate of 0.01 s^-1.更多还原