By conducting thermodynamic calculations on the changes in the content of main elements in a novel nickel-based heat-resistant alloy C-HRA-3,the possible characteristics of the second phase that might precipitate at various temperatures were analyzed.The results show that the main precipitated phases in C-HRA-3 alloy are γ'and M23C6,with a precipitation amount of approximately 3.7wt％for γ'phase and 1.11wt％for M23C6 phase at 700 ℃.The C element has a significant impact on the precipitation amount,redissolution temperature and melting point of M23C6 phase in the alloy.The effect of Co element on the precipitation phase and melting point is relatively small.The Mo element plays a decisive role in the precipitation behavior of M6C phase.The increase in Al and Ti content will significantly increase the precipitation amount and redissolution temperature of the γ'-phase.The Nb element has no effect on the precipitation amount ofγ'-phase,but has a significant impact on the proportion of Nb in the composition elements of the γ'-phase.
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