Abstract: The hot reduction deformation behaviors of N08800 Iron-Nickel base alloy (/% ：0.015C , 20.8Cr , 31.2Ni, 0.42A1 , 0.35Ti) are investigated by hot compression tests with Gleeble-3800 simulated machine. The true stress-true strain curves of alloy at 1150-1280℃ with strain rate 1 ~20 s^-1 are obtained. The a = 0.0092 and n=4.34, and activation energy (Q) =432780 J/mol of high-temperature deformation constants for N08800 alloy are obtained by linear regression of peak stress, the hot deformation peak constitutive equation of N08800 alloy is established. Results show that in hot reduction deformation process at higher temperature with lower strain rate the dynamic recrystallization of the N08800 alloy occures easily, the suitable hot working parameters are 1200-1250℃ and 1-10 s^-1. Commercial production result shows that of N08800 alloy with roughing pass redution 30%-35% , breakdown at 1 150℃ end rolling at 1000℃ ,the 5-6 mm hot rolled coiledge quality is fine.

摘要： 在Gleeble-3800热模拟机上采用等温压缩实验研究了N08800铁镍基合金(/% ：0.015C，20.8Cr， 31.2Ni，0.42Al，0.35Ti)的高温压缩变形行为。获得合金在温度为1150~1280℃、应变速率为1~20 S^-1条件下的真应力-真应变曲线。通过线性回归得到N08800合金的高温材料常数α为0.0092，n为4.34，热变形激活能Q为432780J/mol，建立了N08800合金的热变形峰值本构模型。结果表明，N08800合金在热压缩变形过程中，高温低应变速率下，动态再结晶容易发生，其合适的热加工参数为1200~1250℃、应变速率1~10 s^-1。生产实践表明，N08800合金1150℃初轧，粗轧道次压下率30%～35%,终轧1000℃时5~6mm热轧卷边部质量良好。

关键词: N08800铁镍基合金, 热变形行为, 本构模型, 1200~1250℃动态再结晶