The studies of Superalloy and Intermetallic Group of Institute of Metal Research in the past fifty years on the phase transformation phenomena in Fe-and Ni-base superalloys were reviewed.The phase transformations in the two kinds of superalloys include： the solidification reactions which occur during the solidification,e.g.L → γ ＋ Laves,L → γ ＋ γ ＇ and L → γ ＋ M3B2;precipitation of carbides,borides,silicides,GCP and TCP phases from the supersaturated γ solid solution;precipitation reactions which occur in the γ ＇ phase;and the decomposition reactions of MC carbides.
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