Effect of annealing treatment on microstructure and properties of 3D printed CoCrFeMnNi high-entropy alloy

doi:10.13251/j.issn.0254-6051.2021.08.036

Abstract

Abstract: Equimolar CoCrFeMnNi high-entropy alloy (HEA) was prepared by using selective laser melting (SLM) process, and the tested alloy was annealed at 650 ℃ and 900 ℃ for 1 h, respectively. Combined with microstructure, tensile properties and fracture characteristics analysis, effect of annealing process on microstructure and mechanical properties of CoCrFeMnNi HEA prepared by SLM was studied. The results show that the yield strength, tensile strength and elongation of the as-printed specimen are 672 MPa, 751 MPa and 34.3%, respectively. After annealing at 650 ℃ for 1 h, the yield strength, tensile strength and elongation decrease slightly, which are 583 MPa, 718 MPa and 33.5%, respectively. After annealing at 900 ℃ for 1 h, the yield strength and tensile strength decrease to 494 MPa and 707 MPa, respectively, while the elongation increases to 46.6%.The fracture surface shows typical dimple characteristics, and the deformation mechanism is nano-twinning.

Key words: selective laser melting, CoCrFeMnNi high-entropy alloy, annealing treatment, microstructure, tensile properties

CLC Number:

TG142.1

Wu Ying, Zeng Qiang, Xiao Huijin, Zhu Shaowei. Effect of annealing treatment on microstructure and properties of 3D printed CoCrFeMnNi high-entropy alloy[J]. Heat Treatment of Metals, 2021, 46(8): 192-196.

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