Methods for preparing prefabricated gas pore defects and built-in gas pore defects, and their prefabricated parts

A method for preparing prefabricated gas pore defects, comprising:

• defining a defect area,
• defining a volume percentage of the gas pore defects in the defect area,
• adjusting a proportion of satellite powder, a proportion of hollow powder and process parameters of defect preparation according to the volume percentage of the gas pore defects, based on laser melting deposition, printing the defect area layer by layer by using the defect preparation powder and the process parameters of defect preparation,
• wherein a particle size of the defect preparation powder is between 45 μm and 106 μm, the proportion of satellite powder is 55-65% and the proportion of hollow powder is 2.9-3.1%, the process parameters of defect preparation comprises:
• laser power of 600 W-1000 W, scanning rate of 400 mm/min-800 mm/min, powder feeding rate of 12 g/min-20 g/min, spot diameter of 1 mm-2 mm, scanning spacing of 0.5 mm-1 mm and layer thickness of 0.15 mm-0.2 mm.

A method for preparing a prefabricated part with built-in gas pore defects, based on laser melting deposition, comprising:

• obtaining a 3D model of the prefabricated part
• separating the 3D model into at least one defect area and one forming area,
• defining a volume percentage of the gas pore defects in the defect area,
• adjusting a proportion of satellite powder, a proportion of hollow powder and process parameters of defect preparation according to the volume percentage of the gas pore defects, printing the prefabricated part layer by layer, where the defect preparation powder and the process parameters of defect preparation are used to print the specific layers relative to the defect area,
• wherein a particle size of the defect preparation powder is between 45 μm and 106 μm, the proportion of satellite powder is 55-65% and the proportion of hollow powder is 2.9-3.1%, the process parameters of defect preparation comprises:
• laser power of 600 W-1000 W, scanning rate of 400 mm/min-800 mm/min, powder feeding rate of 12 g/min-20 g/min, spot diameter of 1 mm-2 mm, scanning spacing of 0.5 mm-1 mm and layer thickness of 0.15 mm-0.2 mm.

A method for preparing a repaired part with built-in gas pore defects, based on the technique of laser melting deposition, the repaired part comprises a part body and a repair area, the repair area is used to repair a defect or damage of the part body, the method comprising:

• obtaining a 3D model of the part body and the repair area respectively,
• obtaining the part body,
• separating the 3D model of the repair area into at least one defect area and one forming area,
• defining a volume percentage of the gas pore defects in the defect area,
• adjusting a proportion of satellite powder, a proportion of hollow powder and a process parameters of defect preparation according to the volume percentage of the gas pore defects, printing the repair area on the defect of the part body layer by layer, where the defect preparation powder and the process parameters of defect preparation are used to print the specific layers relative to the defect area,
• wherein a particle size of the defect preparation powder is between 45 μm and 106 μm, the proportion of satellite powder is 55-65% and the proportion of hollow powder is 2.9-3.1%, the process parameters of defect preparation comprises:
• laser power of 600 W-1000 W, scanning rate of 400 mm/min-800 mm/min, powder feeding rate of 12 g/min-20 g/min, spot diameter of 1 mm-2 mm, scanning spacing of 0.5 mm-1 mm and layer thickness of 0.15 mm-0.2 mm.