Effect of Heat Treatment on Microstructure and Properties of Iron-based Medium-entropy Alloys ZHAO Yanchun1,, LI Shu1, LI Chunling2, ZHAO Pengbiao1, LI Wensheng1, KOU Shengzhong1, YAN Fengyun1
1 State Key Laboratory of Advanced Processing and Recycling of Non-ferrous Metals, Lanzhou University of Technology, Lanzhou 730050, China 2 College of Mechano-Electronic Engineering, Lanzhou University of Technology, Lanzhou 730050, China
Abstract: Fe77.3-xMnxSi9.1Cr9.8C3.8 medium-entropy alloys were prepared by water-cooled copper crucible magnetic levitation melting-copper mold ne-gative pressure suction casting method, and the effect of quenching at 1 100 ℃ for different time on microstructure and mechanical properties of the alloys was studied. The results show that the Fe77.3-xMnxSi9.1Cr9.8C3.8 medium-entropy alloys are all low stacking fault energy alloys, the structure of the Fe63.3Mn14Si9.1Cr9.8C3.8 alloy is a single FCC structure before and after heat treatment, the structure of the as-cast Fe54.3Mn23-Si9.1Cr9.8C3.8 alloy is FCC and HCP dual-phase structure, and the HCP structure is transformed into FCC structure during quenching at 1 100 ℃. The comprehensive mechanical properties of the Fe77.3-xMnxSi9.1Cr9.8C3.8 medium-entropy alloys are the best when the holding time is 20 min. The fracture strength and plasticity of the Fe63.3Mn14Si9.1Cr9.8C3.8 alloy after heat treatment are respectively 3 250 MPa and 24.5%, and the river pattern is dense in the fracture morphology, and the dimples in the central region of the fracture surface are dense and uniform.
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2022, Vol. 36 
