Precipitation Behavior of η Phase and Its Effect on Hot Deformation in 718Plus Alloy
Solid-state microstructure,microstructure evolution of η phase and the recrystallization microstructure of 718Plus alloy with different η phase after compression with different compression amounts were investigated by OM,SEM and the thermal simulation compression testing machine.The compression process of different temperatures and deformation rates were obtained.The results show that the peak temperature of η phase precipitation occurs at 900 ℃.The dissolution behavior of ηphase is mainly affected by solution time,and it dissolves effectively after solution treatment at 1040 ℃ for 2 h.A small quantity of η phase contributes to dynamic recrystallization in large deformation process while a large quantity of η phase restrain dynamic recrystallization.At appropriate deformation temperature and rate,a small quantity of η phase interacts with the dynamic recrystallization process,which makes for the uniform fine crystal structure.
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