摘要
为解决高温合金的难变形问题,研究了高密度脉冲电流对GH4049合金静态再结晶行为的影响规律,分析了再结晶起始温度、再结晶激活能随脉冲电流频率变化的规律及机制,讨论了时效过程中粗化γ'相对合金再结晶行为的影响.研究表明:与常规温度场相比,脉冲电流作用下GH4049合金的静态再结晶起始温度明显降低,且降低幅度随脉冲电流频率、电流密度增加而增大;粗化的γ'相对合金的静态再结晶有促进作用,这对于解决难变形镍基高温合金热加工变形温度区间窄的问题具有积极意义.
To solve the problem of hard-deformation of Gh4049 superalloy, the effects of high density electron pulsing current on both the variation of initial temperature and activation energy of recrystallization of the alloy were investigated, and the influence of coarsen γ′during aging on crystallization behavior was also discussed. It is found that compared with normal annealing treatment, the initial temperature of recrystallization decreases apparently and the reducing ratio increases with the increasing of pulse frequency or current density. Meanwhile, the recrystallization can also be promoted by the coarsen γ′particles. The results obtained in the present study can be applied to enlarge the hot deforming temperature range of GH4049 superalloy. The electron wind force caused by the electron pulsing current can reduce the resistance of dislocation movement, and decrease the activation energy of recrystallization. Both nucleation and growth of recrystallization of the superalloy can be promoted with the adding of electron pulsing current.
出处
《材料科学与工艺》
EI
CAS
CSCD
北大核心
2014年第5期1-5,共5页
Materials Science and Technology
基金
国家大学生创新性实验计划项目(120051)
国家自然科学基金资助项目(51171039
51371044)
关键词
GH4049合金
脉冲电流
再结晶
再结晶起始温度
再结晶激活能
γ’相
GH4049 superalloy
pulsing current
recrystallization
initial temperature of recrystallization
activation energy of recrystallization
γ'
