PREFABRICATED AIR HOLE DEFECT, PREPARATION METHOD FOR BUILT-IN AIR HOLE DEFECT, AND PREFABRICATED MEMBER

摘要

Disclosed are a preparation method for a prefabricated air hole defect, a preparation method for a built-in air hole defect, and a prefabricated member (1) with the built-in air hole defect. The preparation method for a prefabricated air hole defect comprises: setting a defect area (10, 10a); setting the volume proportion of a air hole defect in the defect area (10, 10a); adjusting a satellite spherical powder proportion, a hollow powder proportion, and defect preparation process parameters according to the volume proportion of the air hole defect; and printing the defect area (10, 10a) layer by layer by using defect preparation powder and the defect preparation process parameters and on the basis of on a laser melting deposition process, wherein the particle size of the defect preparation powder is between 45 μm to 106 μm; in the defect preparation powder, the proportion of the satellite spherical powder is 55-65%, and the proportion of the hollow powder is 2.9-3.1%; and the defect preparation process parameters include: a laser power of 600 W to 1000 W, a scanning rate of 400 mm/min to 800 mm/min, a powder feed rate of 12 g/min to 20 g/min, a light spot diameter of 1 mm to 2 mm, a scanning interval of 0.5 mm to 1 mm, and a layer thickness of 0.15 mm to 0.2 mm.