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采用Gleeble-1500热模拟压缩试验机对028合金进行恒温热压缩实验,变形温度为1120~1220℃,应变速率为0.1~10 s-1,研究了028合金的热变形行为及加工图,得到了028合金最佳的热挤压工艺。结果表明,建立的本构方程能较好的预测028合金在热变形中的峰值应力;028合金在热加工过程中发生动态再结晶,随变形温度升高,动态再结晶百分数和晶粒尺寸逐渐增加,动态再结晶晶粒尺寸随应变速率增加而减小,加工图中存在两个安全区、一个失稳区和一个危险区,028合金的最佳热挤压温度为1200℃,应变速率为1 s-1。
The hot compression behavior of 028 alloy was investigated by Gleeble-1500 thermal simulation compression testing machine. The deformation temperature was 1120 ~ 1220 ℃ and the strain rate was 0.1 ~ 10 s-1. The hot deformation behavior and processing diagram of 028 alloy were investigated. 028 alloy best hot extrusion process. The results show that the constitutive equation established can predict the peak stress of 028 alloy during hot deformation. 028 alloy undergoes dynamic recrystallization during hot working. With the increase of deformation temperature, the dynamic recrystallization percentage and grain size gradually increase The dynamic recrystallization grain size decreases with the increase of strain rate. There are two safety zones, one destabilization zone and one danger zone in the working drawing. The optimum hot extrusion temperature of 028 alloy is 1200 ℃ and the strain rate is 1 s-1.