▎ 摘　　要

NOVELTY - The graphene reinforced nickel-based super-alloy powder comprises 14-17 wt.% of chromium, 8-10 wt.% of molybdenum, 0.3-0.6 wt.% of manganese, 0.03-0.08 wt.% of zirconium, 0.007-0.01 wt.% of beryllium, 1-2 wt.% of boron, 0.3-0.5 wt.% of graphene and balance of nickel. USE - Graphene-reinforced nickel-base high-temperature alloy powder for selective laser melting of alloy parts (claimed) such as hot end parts of aeroengines e.g. turbine blades, turbine disks and guide blades. ADVANTAGE - The graphene-reinforced nickel-based high-temperature alloy powder has improved strength, hardness, wear-resistance, improved mechanical properties, corrosion resistance, increased alloys formability, improved surface quality, and no hair crystals and columnar crystals, which can effectively overcome the casting cracks and improve the appearance of the castings. The alloy also reacts with part of the graphene to form carbides, which further improves the hardness and wear resistance of the material. The addition of molybdenum refines the grains of the nickel-based super-alloy, improves the temperature-bearing capacity and maintain sufficient strength and creep resistance at high temperatures. The nickel-based super-alloy has increased density, avoids cracks in castings, reduced temperature gradient, and improved performance of castings. The addition of graphene can increase the crystallization speed of nickel-based super-alloys, thus reducing grain boundary segregation, and avoids spheroidization during laser melting. The elements are fully alloyed and have the superiority of an inherent property of the super-alloy matrix. The nickel-based alloy matrix inhibits the formation of cellular elongated grains, reduces texture, and improves the strength and plastic toughness of the super-alloy materials. The preparation method of the super-alloy powder is simple, and the casting prepared by the method has high density and excellent mechanical properties. DETAILED DESCRIPTION - INDEPENDENT CLAIMS are included for: (1) a preparation method of the graphene-reinforced nickel-base alloy powder; and (2) a method for preparing graphene-reinforced nickel-based super-alloy parts by laser selective melting.