Thermodynamic calculation of a novel nickel-based heat-resistant alloy C-HRA-3

doi:10.13251/j.issn.0254-6051.2024.12.043

Abstract

Abstract: 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 of γ'-phase, but has a significant impact on the proportion of Nb in the composition elements of the γ'-phase.

Key words: C-HRA-3 heat-resistant alloy, thermodynamic calculation, precipitated phase

CLC Number:

TG142.33

Zhang Peng, Chen Zhengzong. Thermodynamic calculation of a novel nickel-based heat-resistant alloy C-HRA-3[J]. Heat Treatment of Metals, 2024, 49(12): 268-273.

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