Materials Science Forum Vol. 946

Abstract: In this paper we consider the effectiveness of additive technologies for the technological preparation of production of shaped complex products. The aspects of application of additive technologies in diversified production cycles of enterprises are stated. The positive aspects of the use of additive technologies in the design development of technological cycles of complex products are considered. The need to reduce the weight and size of modern aircraft makes the developers of these systems apply increasingly new and innovative solutions in the field of product design and in the field of their direct production. Additive technologies allow to reduce the weight of the product, while maintaining all the characteristics laid by the designer. The paper considers a cyclic hybrid technology in the production of parts and elements of aircraft. Each cycle consists of direct laser growing of the working surface of the part and subsequent machining. The aspects of production of details from the point of view of ensuring the condition of unity of design and technological base are considered, and also the analysis of the errors of production excluded in the course of the offered technology arising at traditional cycles of production of such detail is carried out.

Abstract: Selective laser melting (SLM) technology makes it possible to produce complex shape metallic and metal-matrix composite (MMC) bulk parts from powder feedstock. This paper is devoted to selective laser melting of mechanically mixed metal (gas atomized EP648 alloy) and ceramic (alumina) powders. Four 10x10x5 mm specimen were successfully manufactured using different process parameters. Obtained MMC specimen were characterized by scanning electron microscopy. A possibility of manufacturing of dense EP648-alumina MMC by SLM using two-component mixed powder was shown

Abstract: Various "energy density" parameters are used very often for comparison of fabrication modes for Selective Laser Melting (SLM) technology. Each SLM mode is determined by a number of process parameters. In this paper the energy density was considered critically as a reliable parameter for characterization of Selective Laser Melting of four various alloys on one SLM machine, on the example of fabrication of cubic specimen. The results obtained show that the energy density can be used for approximate comparison of SLM modes.

Abstract: Selective laser melting (SLM) is an additive manufacturing technology that allows to produce functional parts with extremely complex shape from metal powder feedstock. 240 single tracks with the length of 10 mm were fabricated using different SLM process parameters: laser power output, powder layer thickness, point distance and exposure time. Obtained single tracks were measured using optical microscopy. An influence of SLM process parameters on geometrical characteristics of obtained single tracks was investigated.

Abstract: Numeric simulation of compression test was carried out for a high-porous structure of a titanium alloy produced by additive manufacturing method with non-equiaxial performance of pore cells. The stress-strain state of a cellular titanium alloy with diamond-shaped unit cells was determined by the finite element method (FEM) in ABAQUS software for the plane formulation of the problem. The distribution of stresses, as well as the modulus of elasticity of the cellular material, was proved to depend on the loading direction.

Abstract: The results of the analysis of the plasma atomized powder material are shown. An analysis of the microstructure in lightweight constructions made of VT6 alloy by selective laser melting was carried out. The microstructure and mechanical characteristics of the obtained structures were studied before and after heat treatment. Measurement of grain size in the microstructural analysis gave a more complete picture of the state of the structure in different parts of the sample formed as a result of growing by selective laser melting, in a mesh and compact. In the course of the work, the peculiarities of the growth of grains in bars of the mesh construction are revealed depending on their location.