The precipitation and dissolution together with their control of the primary η-phase in a high-Ti Ni-Fe-Cr base superalloy have been investigated.The precipitation of primary η-phase was found to be closely related to Ti or Al content and solidification rate of the alloy. The aggregation of blocky η-phase may remarkably reduce the tensile strength,ductility and rupture life of the alloy.The temperature-time relation of dissolution of the primary η-phase obeys T=1370-86.1 lgt for as-cast superalloy.The formation of primary η-phase may be prevented by the reasonable control of Ti or Al content and smelting process.The adoption of treatment under large hot deformation and homogenization may be the remedy for unfavorable influence of η-phase.
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