(西北工业大学 材料学院，西安 710072)
摘 要: 采用热模拟压缩试验研究GH696合金在变形温度为880~1020 ℃、应变速率为0.01~10.0 s-1、变形程度为30%~60%条件下的高温变形行为。采用金相显微镜对GH696合金高温压缩变形后的显微组织进行观察。结果表明：较高的变形温度和较低的应变速率有利于GH696合金的动态再结晶。采用加工硬化率-流动应力曲线确定GH696合金的动态再结晶临界应变，应用Avrami方程建立GH696合金的动态再结晶体积分数模型，并根据合金的金相定量试验结果建立GH696合金的动态再结晶晶粒尺寸模型。
关键字: GH696合金；热模拟压缩；动态再结晶；晶粒尺寸
（School of Materials Science and Engineering, Northwestern Polytechnical University, Xi’an 710072, China）
Abstract:The deformation behavior of GH696 superalloy was studied by isothermal compression experiments the deformation temperatures ranging from 880 to 1120 ℃, strain rates ranging from 0.01 to 10.0 s-1 and deformation degree ranging from 30% to 60%. The microstructure of GH696 superalloy after compression was observed on a microscope. The results show that dynamic recrystallization of GH696 superalloy occurs more easily at higher deformation temperature and lower strain rate. The critical strain of dynamic recrystallization of this alloy is identified based on the work hardening rate versus flow stress curves. The kinetics of dynamic recrystallization of GH696 superalloy is established based on Avrami equation. A model for DRX grain size is established based on OM experimental measurement results of GH696 superalloy.
Key words: GH696 superalloy; isothermal compression; dynamic recrystallization; grain size
