Evolution of Microstructures and Properties of a New γ/γ′ Co-Based Superalloy via Forging Process
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A new γ/γ′ Co-based superalloy has been developed with a large temperature range between the γ′ solvus and solidus temperature, which can be formed through the conventional casting and wrought processing route. The microstructure, mechanical and corrosion resistance properties of this new γ/γ′ Co-based superalloy are characterized in the present study. The results show that even in the forged state, the partial recrystallization and grain growth processes occur, but the γ′ precipitates remain very fine. Forging and aging increase the mechanical strength and facilitate the formation of stable passive films due to decreased low-angle boundaries and increased Σ3 twin boundaries. The twin boundaries are beneficial for improving both the mechanical properties and corrosion resistance, which provides guidance for tailoring the microstructure and properties of novel Co-based superalloys.
This work was jointly supported by the National Natural Science Foundation of China (Nos. 51671187, 51701206) and the Foundation of President of Hefei Institutes of Physical Science, Chinese Academy of Sciences (No. YZJJ201703).
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