固溶处理GH4169合金的高温变形行为

Deformation Behavior of Nickel Based Superalloy GH4169 Through Solution Treatment

对GH4169合金进行了固溶温度为1233,1253,1273,1293K,保温时间为30～60min的固溶处理试验,得到了GH4169合金中δ相形貌由针状向短棒状和颗粒状转变,数量逐渐减少直至消失的演变规律。将固溶处理后的GH4169合金通过热模拟压缩实验,研究变形工艺参数和固溶处理对GH4169合金高温变形行为的影响。热模拟压缩实验时选取的变形温度为1123～1288K,应变速率为0.1～10.0s-1,变形程度为60%。结果表明:流动应力随变形温度的降低和应变速率的提高而迅速增大,δ相不仅使流动应力降低,而且对动态再结晶过程产生强烈的促进作用;利用多元回归分析方法建立的流动应力模型的计算值与实验值的误差小于10%,较好地描述了固溶处理GH4169合金在高温变形过程中的塑性流动行为。

The microstructure observation results of superalloy superalloy GH4169 show that during the holding time at 1 233,1 253,1 273 and 1 293 K for 30 up to 60 minutes the morphology of the δ phase changes from long needle shape to short bars and particles,accompanies by a corresponding the decrease of δ phase content until it disappears. The effect of the processing parameters and solution treatment on the deformation behavior of superalloy GH4169 is investigated using compression tests. Experiments are carried out in a Thermecmaster-Z simulator at deformation temperatures of 1 123-1 288 K,and strain rates of 0.1-10.0 s-1. The results shows that the flow stress increases drastically with the decrease of deformation temperature and the increase of strain rate. The existence of the δ phase not only decreases the flow stress,but also effectively promotes the dynamic recrystallization process. The flow stress model of superalloy GH4169 during high temperature deformation is established by using the regression method. The average relative difference between the calculated and the experimental flow stress is less than 10%. It can be concluded that the flow stress model can efficiently effectively predict the deformation behavior of superalloy GH4169 during high temperature deformation.