Microstructure and Mechanical Properties of Objects Prepared by Selective Laser Melting of AKD12 Powder

摘要

The morphology and elemental composition of Al-12% Si powder grade AKD12 of three fractions are studied. Powder is prepared in an original molten metal gas spraying unit UR-9 in a high-purity nitrogen atmosphere. Results are provided for measurement of mechanical properties, a study of outer surface morphology and the failure surface of objects prepared by selective laser melting from AKD12 powder fraction less than 45 m. It is shown that the mechanical properties of these objects surpass these indices for analogs produced overseas, i.e., ultimate strength sigma(u) = 245 MPa with relative elongation = 12%.