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摘要
To enhance the ambient mechanical properties of a CrFeCoNi high-entropy alloy, the alloying of 3%C (in atomic fraction) was performed. The alloys were subject to homogenization treatment at 1 200 ℃ for 12 h, cold rolling and recrystallization annealing at 800 ℃ for 1 h, obtaining fully recrystallized microstructures. The effects of carbide precipitation on the phase structure, microstructure, tensile behavior and corrosion behavior at room temperature were analyzed. The results reveal that after C alloying, spherical M23C6 carbides are precipitated besides of equiaxed-grained matrix with face-centered cubic structure, which are non-uniformly distributed on the grain boundaries and in the intragranular regions. The yield strength at room temperature is increased from 386 MPa of the CrFeCoNi alloy to 706 MPa of the C-alloyed one, however, the elongation and corrosion resistance are decreased to some extent. ? 2019, Journal Office of Special Casting and Nonferrous Alloys. All right reserved.
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