(1. 江苏大学 材料科学与工程学院，镇江 212013；2. 丹阳精密合金厂，镇江 212352)
摘 要: 在Gleeble−3500热模拟实验机上对Delta工艺Inconel 718合金进行高温压缩实验，研究其高温压缩变形的流变应力行为。结果表明：δ相时效态Inconel 718合金在本实验条件下具有正的应变速率敏感性，流变应力随着应变速率的降低和变形温度的升高而减小，动态再结晶是合金重要的软化机制。δ相时效态Inconel 718合金的热变形激活能为497.407 kJ/mol，高温压缩峰值流变应力与变形温度和应变速率的关系可用双曲正弦函数表示。
关键字: Inconel 718合金；Delta工艺；高温压缩；流变应力；热变形激活能
Inconel 718 superalloy under hot compression deformation
（1. School of Materials Science and Engineering, Jiangsu University, Zhenjiang 210213, China;
2. Danyang Precision Alloy Factory, Zhenjiang 212352, China）
Abstract:The flow stress behavior of the delta-processed Inconel 718 superalloy was investigated by the hot compression on Gleeble−3500 test machine. The results of the thermal simulation compression tests show that the flow stress is positively sensitive to the strain rate and the deformation temperature. The peak stress decreases with the decreasing strain rate and increasing deformation temperature. The dynamic recrystallization is the main softening mechanism of the hot deformation of the delta-processed Inconel 718 superalloy. The activation energy (Q) of the delta-processed δ phase aged Inconel 718 superalloy is 497.407 kJ/mol. The relationships among the flow stress, the deformation temperature and the strain rate for the delta-processed Inconel 718 can be described by the hyperbolic sine-type function.
Key words: Inconel 718 superalloy; delta process; hot compression; flow stress; hot deformation activation energy
