热处理对铁基中熵合金微观结构及力学性能的影响

doi:10.11896/cldb.20090161

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Abstract Fe_77.3-xMn_xSi_9.1Cr_9.8C_3.8 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 Fe_77.3-xMn_xSi_9.1Cr_9.8C_3.8 medium-entropy alloys are all low stacking fault energy alloys, the structure of the Fe_63.3Mn₁₄Si_9.1Cr_9.8C_3.8 alloy is a single FCC structure before and after heat treatment, the structure of the as-cast Fe_54.3Mn₂₃-Si_9.1Cr_9.8C_3.8 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 Fe_77.3-xMn_xSi_9.1Cr_9.8C_3.8 medium-entropy alloys are the best when the holding time is 20 min. The fracture strength and plasticity of the Fe_63.3Mn₁₄Si_9.1Cr_9.8C_3.8 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.

Key words： medium-entropy alloys heat treatment structure mechanical property

Published: 13 January 2022 Online: 2022-01-13

CLC number:

TG142.1

Fund:This work was financially supported by the National Natural Science Foundation of China (52061027,51661017), the Outstanding Youth Fund Project of Gansu Province (17JR5RA108) and Lanzhou University of Technology Hongliu Outstanding Youth Fund Project (2018).

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medium-entropy alloys,heat treatment,structure, et al. Effect of Heat Treatment on Microstructure and Properties of Iron-based Medium-entropy Alloys ZHAO Yanchun^1,, LI Shu¹, LI Chunling², ZHAO Pengbiao¹, LI Wensheng¹, KOU Shengzhong¹, YAN Fengyun¹[J]. Materials Reports, 2022, 36(1): 20090161-5.

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http://www.mater-rep.com/EN/10.11896/cldb.20090161 OR http://www.mater-rep.com/EN/Y2022/V36/I1/20090161

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