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Abstract

Disclosed are a nickel-based superalloy formed by selective laser melting and a preparation method thereof, belonging to the technical field of an additive manufacturing from metal powder. In the disclosure, CrFeNb alloy powder is used as a grain refiner, and its element composition is within the composition range of a nickel-based superalloy powder to ensure that the prepared nickel-based superalloy has the same element composition with the original alloy; the grain size in the nickel-based superalloy could be refined by the addition of CrFeNb alloy powder, such that the anisotropic columnar grain structure in the alloy is transformed to equiaxed grain structure, thereby improving mechanical properties of the alloy. The results of the examples show that the nickel-based superalloy prepared in the disclosure exhibits a yield strength of not less than 710 MPa at room temperature, a tensile strength of not less than 1010 MPa, an elongation of not less than 19%, and a hardness of not less than 330 HV; after the heat treatment, the nickel-based superalloy exhibits a yield strength of not less than 1400 MPa, a tensile strength of not less than 1100 MPa, an elongation of not less than 5.09%, and a hardness of not less than 530 HV.

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