The as-cast microstructure of traditional IN706 and modified IN706 alloy was observed and analyzed,and the law of precipitated phase re-dissolution was studied. The results show that there are plenty of γ+γ′eutectic structure,η phases,Laves phases and M(C,N) in alloy as-cast structure. γ+γ′eutectic structure and needle-like η phase could be completely re-dissolved into the matrix when the holding temperature is above 1100℃. For IN706 alloy,the incipient melting point of the Laves phase is 1160～1180℃. For the IN706m alloy,the incipient melting point of the Laves phase is 1140～1160℃. In actual production,choose 1140℃ and hold for 8h,Laves phases could be completely re-dissolved into the matrix without incipient melting,and the element microsegregation can be eliminated effectively.
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