(1. 河南科技大学 材料科学与工程学院，洛阳 471003；
2. 河南科技大学 河南省有色金属材料科学与加工技术重点实验室，洛阳 471003；
3. 燕山大学 亚稳材料制备技术与科学国家重点实验室，秦皇岛 066004；
4. 中国人民解放军63883部队，洛阳 471000)
摘 要: 在变形温度为1 050~1 180 ℃、应变速率为0.1~10 s−1、最大真应变为0.7的条件下，采用Gleeble−3500热模拟试验机研究GH4199合金的热压缩变形行为，得到该合金的热变形激活能及热变形方程式，建立合金的热加工图，并通过组织观察对其热加工图进行解释。结果表明：在实验条件下，GH4199合金均表现出动态再结晶特征；变形温度和应变速率对合金流变应力及相应峰值应变大小的影响显著，流变应力及峰值应变均随着变形温度的降低和应变速率的增加而增大；在真应变为0.1~0.7时合金的热加工图相似，随着变形温度的升高及应变速率的降低，能量消耗效率逐渐升高；在应变速率为0.01 s−1时，能量消耗效率达到峰值，约为41%。
关键字: GH4199合金；热变形激活能；热变形方程；热加工图
of superalloy GH4199
（1. School of Materials Science and Engineering, Henan University of Science and Technology, Luoyang 471003, China;
2. Henan Key Laboratory of Advanced Non-ferrous Metals, Henan University of Science and Technology, Luoyang 471003, China;
3. State Key Laboratory of Metastable Materials Science and Technology, Yanshan University, Qinhuangdao 066004, China;
4. No.63883 Unit of PLA, Luoyang 471000, China）
Abstract:The hot compression deformation behavior of the superalloy GH4199 was investigated on Gleeble−3500 hot simulator at the temperature of 1 050−1 180 ℃, strain rate of 0.1−10 s−1 and maximum true strain value of 0.7. The hot deformation activation energy and hot deformation equation of superalloy GH4199 were obtained, its processing maps were established and explained on the basis of microstructure observation. The results show that under this experimental conditions the superalloy GH4199 shows dynamic recrystallization characteristics during the hot compression deformation. Both the deformation temperature and strain rate have obvious influences on the flow stress and its corresponding peak strain, which increase gradually with decreasing temperature and increasing strain rate. The maps obtained at the true strains of 0.1−0.7 are essentially similar. The efficiency of power dissipation of the superalloy GH4199 increases gradually with increasing temperature and decreasing strain rate. A peak efficiency of power dissipation of about 41% appears at about 0.01 s−1.
Key words: superalloy GH4199; hot deformation activation energy; hot deformation equation; processing maps
