FGH4169合金的高温变形行为

Hot deformation behavior of FGH4169 superalloy

利用MMS 200热模拟实验机对FGH4169合金进行高温压缩实验,建立该合金高温变形本构方程。研究结果表明:在变形温度为950～1 050℃,应变速率为0.004～10 s 1的条件下,动态再结晶是该合金的重要软化机制;FGH4169合金在950～1 050℃范围内的激活能为430 kJ/mol,该合金的功率耗散效率约比Inconel718合金的功率耗散效率高10%,峰值效率达到57%。并得到FGH4169合金在本实验条件下的加工图;其适合加工工艺如下:变形温度为1 010～1 050℃,应变速率为0.01～0.1 s 1,或者变形温度为980℃,应变速率为0.004～0.01 s 1。

The hot deformation behavior of FGH4169 alloy was studied by single-stroke compression test on MMS-200 test machine at the temperature of 920-1 050℃ and the strain rate of 0.004-10 s-1. The constitutive equation of the plastic deformation of FGH4169 alloy was obtained by calculation. The results show that flow stress reaches a peak with the increase of strain. Dynamic recrystallization is the main softening mechanism of the hot deformation of FGH4169 alloy, The power dissipation efficiency is 10% higher than that of Inconel718, and the peak efficiency is about 57%. The hot deformation activation energy is calculated about 430 kJ/mol. The suitable deformation condition is at the temperature from 1 010 to 1 050℃ with strain rate from 0.01 to 0.1 s-1 or at the temperature of 980℃ with the strain rate from 0.004 to 0.01 s 1 according to the processing map.