Abstract: The microstructure and morphology of the alloy were characterized by metallographic microscope and thermasimulation test and other equipment， and the thermal deformation parameters were set at different strain temperatures of 850-1150 ℃ and strain rates of 0. 1-10 s^-1. It was analyzed by combining the stress-strain curve of thermal simulation compression test and the microstructure morphology， the thermal deformation behavior and microsturcture morphology evolution process of 4J32 super invar alloy （Fe-32Ni-4Co） at high temperature 850-1 150 ℃ were systematically studied. It is found that no dynamic recrystallization occurs during hot deformation of 4J32 super invar alloy below 900 ℃， and there are a lot of deformed grain structures in the alloy. When the thermal deformation temperature is greater than 1 050 ℃， the dynamic recrystallization of the alloy begins， and the faster the strain rate， the higher the dynamic recrystallization degree.The results show that the optimum thermal deformation temperature of super invar alloy is greater than 1100 ℃ and the strain rate is 10 s^-1.

Key words: 4J32 Super Invar Alloy, Thermal Simulation, Dynamic Recrystallization, Microstructure

摘要： 使用热模拟压缩试验仪器，设置 850～1150 ℃不同应变温度和 0. 1～10 s^-1应变速率等热变形参数进行试验，通过金相显微镜、热模拟试验等设备对合金进行组织形貌表征，结合热模拟压缩试验应力应变曲线及合金组织形貌进行分析，系统性研究4J32超因瓦合金（Fe-32Ni-4Co）在850～1150 ℃高温热变形行为及组织形貌演变过程。研究发现，4J32超因瓦合金在900 ℃以下热变形过程不发生动态再结晶，且合金中存在大量的变形晶粒组织。当热变形温度大于 1050 ℃时，合金开始发生动态再结晶，且应变速率越快其动态再结晶程度越高。研究结果表明，超因瓦合金最优的热变形温度＞1100 ℃，应变速率为10 s^-1。

关键词: 4J32超因瓦合金, 热模拟, 动态再结晶, 组织