ЗАЛЕЖНІСТЬ МЕХАНІЧНИХ ВЛАСТИВОСТЕЙ СПЛАВУ ABD900 ВІД ОРІЄНТАЦІЇ ПОБУДОВИ ПРИ LPBF

<jats:p>Features of LPBF technology can lead to directional structures and anisotropy in the material's mechanical properties, necessitating further research into new heat-resistant alloys optimized for additive manufacturing. Purpose: study of the influence of manufacturing orientation on the mechanical properties of test specimens made of heat-resistant alloy ABD900. Research objectives: development of CAD models of tensile test specimens in accordance with DSTU ISO 6892:2019, with manufacturing parameters: power - 195 W, scanning speed - 1100 mm/s, distance between tracks - 0.09 mm, layer thickness - 40 μm; determination of mechanical properties of test specimens made in horizontal and vertical directions; determination of the continuity of test specimens by the metallographic method after tensile tests. Research methods. Production of experimental samples from heat-resistant powder of the ABD900 alloy using LPBF technology, and microscopic studies using an AxioVert 200M Mat optical microscope. Scientific novelty. The regularities of the influence of the manufacturing orientation using LPBF technology on the mechanical properties and structural state of the heat-resistant alloy ABD900 have been established. Practical significance. The results obtained can be used to select the orientation for manufacturing parts from the ABD900 alloy, ensuring the required strength and ductility for the intended purpose. Results. It was established that horizontally oriented samples (XY) exhibit higher strength indicators: the strength limit is 1115 MPa, and the yield strength is 810 MPa, which are 6.1% and 9.8% higher, respectively, than those of vertically oriented samples. At the same time, samples manufactured in the Z direction exhibit higher plastic properties: the relative elongation is 43.8%, and the relative narrowing is 41.3%, which are 4.5% and 14.5% higher than the values for the horizontal ones, respectively. Metallographic studies have established a high density of the material (99.75%) and the presence of individual spherical pores measuring 2-11 μm. A textured structure with columnar grains of epitaxial origin and a finely dispersed cellular-dendritic structure, characteristic of LPBF technology, has been revealed. It has been shown that the manufacturing orientation is one of the determining factors in the formation of the complex of mechanical properties of the ABD900 alloy.</jats:p>