Effect of primary γ'phase on deformation characteristics and dynamic recrystallization behavior of GH4151 alloy
Taking the forged GH4151 alloy as the research object,the influence of different heat treatment temperatures and holding time on the precipitation and dissolution law of primary γ'phase was analyzed,and the parameters for further cyclic heat treatment were determined.Furthermore,the morphology and distribution of γ'phase were changed through cyclic heat treatment,and hot compression tests were conducted on the samples after cyclic heat treatment.The effects of primary γ'phase on the high temperature deformation characteristics and dynamic recrystallization behavior of the GH4151 alloy were analyzed by means of electron backscatter diffraction(EBSD)technique,scanning electron microscopy(SEM)and transmission electron microscopy(TEM).The results show that the γ'phase re dissolution phenomenon of the GH4151 alloy is more obvious when held at 1130 ℃ for 15 min,and the distribution of primary γ'phase at grain boundaries is more uniform.Therefore,holding at 1130 ℃ for 15 min is selected as the basic parameter for further cyclic heat treatment.As the number of cyclic heat treatment increases,the primary γ'phase pinned at the grain boundaries becomes finer and more dispersed and rounded.Under high strain rates,the flow stress of the alloy increases significantly.The presence of primary γ'phase at grain boundaries results in the dynamic recrystallization mechanism of the GH4151 alloy during hot deformation mainly being y'phase induced dynamic recrystallization and continuous dynamic recrystallization.
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