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

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.