Study on Equilibrium Phase Precipitation Behavior of Four Advanced Ultra-Supercritical Unit Alternative Nickel-Based Superalloys
The equilibrium phase precipitation patterns of four advanced ultra-supercritical unit Alternative nickel-based superalloys Inconel 617,C-HRA-2,Inconel 740 and C-HRA-1 were studied using Thermo-Calc Software.The high-temperature phase diagrams of the four alloys were calculated,and the precipitation behavior of the main precipitated phases was analyzed.Finally,the calculation result was compared with the experiment to verify accuracy.The results indicate that the main precipitates of the four alloys include γ,γ',σ,δand carbides,etc.The equilibrium precipitation amount of γ',σ and δ phases increases with the decrease of temperature.The four alloys have different types,contents,and precipitation ranges of carbides.The carbides of Inconel 617 and C-HRA-2 are M23C6(primary)and M6C(secondary),while the carbides of Inconel 740 and C-HRA-1 are MC(primary)and M23 C6(secondary).Borides are unique to C-HRA-2.The thermodynamic equilibrium calculation results are basically consistent with the experimental detection.Mastering the thermodynamic calculation results of the main precipitates in alloys plays an important role in understanding their high-temperature long-term microstructure and performance stability.
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