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Your search keyword '"Demakov, S. L."' showing total 47 results
Start Over Author "Demakov, S. L." Publication Type Academic Journals
47 results on '"Demakov, S. L."'

8. Effect of process parameters of selective laser melting on the structure, texture, and mechanical properties of an alloy based on orthorhombic titanium aluminide Ti2AlNb.

Author

Illarionov, A. G., Demakov, S. L., Stepanov, S. I., Karabanalov, M. S., Lugovaya, K. I., Shabanov, M. A., and Popov, A. A.

Abstract

The impact of selective laser melting (SLM) process parameters on the porosity, microstructure, phase and chemical composition, texture, and physical-mechanical properties of orthorhombic titanium aluminide Ti2AlNb (O-alloy) powder was studied using a range of methods, including hydrostatic weighing, scanning and transmission electron microscopy, X‑ray diffraction analysis, energy-dispersive X‑ray spectroscopy, microindentation, and compression testing. It was demonstrated that an increase in the volumetric energy density within the range of 28 to 139 J/mm3 led to the following effects: 1) increase in the relative density of the obtained O‑alloy from 97 to 99.9%, 2) intensification of axial texture with a pronounced 001 direction in the detected β/B2-solid solution, and 3) reduction in the Al content, increase in the Nb content, and lower enrichment with oxygen in the obtained samples. It was demonstrated that detachment from the build platform and longitudinal cutting of the O‑alloy results in the imbalance of residual stresses in samples synthesized on a platform, pre-heated at 200 °C, which is accompanied by the formation of cracks. This study considers the typical structural defects of the alloy, including pores, lack of fusion, and chemical heterogeneity, which are observed following SLM. A series of physical-mechanical properties of the synthesized O‑alloy samples were determined, including Vickers hardness (390–430 HV), elastic modulus (91–98 GPa), compressive yield strength (1060–1080 MPa), and compressive strain (of at least 30%). The relationship between these properties and the structural-textural state of the obtained O‑alloy samples is discussed. [ABSTRACT FROM AUTHOR]

Published
2024
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11. Effect of Temperature and Rate Treatment Parameters on the Structural Phase State and Properties of Ti2AlNb Titanium Aluminide-Based Alloy.

Author

Demakov, S. L., Vodolazskii, F. V., Illarionov, A. G., Shabanov, M. A., and Karabanalov, M. S.

Subjects
TITANIUM alloys, TEMPERATURE effect, INTERMETALLIC compounds, HEAT resistant alloys, MODULUS of elasticity, DIFFERENTIAL thermal analysis
Abstract

Abstract—Differential thermal analysis, scanning electron microscopy, X-ray diffraction analysis, and microindentation are used to study changes in the structure, phase composition, microhardness, and contact modulus of elasticity of a heat-resistant alloy based on the Ti2AlNb titanium intermetallic compound, depending on the rate of colling (10–80°/min) from heating temperatures of 950 and 970°С. Using the results obtained, thermokinetic diagrams of high-temperature decomposition of the β(B2) solid solution are constructed. [ABSTRACT FROM AUTHOR]

Published
2024
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17. Alloys Based on Orthorhombic Intermetallic Ti2AlNb: Phase Composition, Alloying, Structure, Properties.

Author

Illarionov, A. G., Demakov, S. L., Vodolazskiy, F. V., Stepanov, S. I., Illarionova, S. M., Shabanov, M. A., and Popov, A. A.

Subjects
HEAT resistant alloys, ALLOYS, TITANIUM alloys, HEAT treatment, MANUFACTURING processes, PHASE diagrams, PHASE transitions
Abstract

The article analyses data for chemical composition, manufacturing and processing methods for promising heat-resistant alloys based upon orthorhombic titanium intermetallic Ti2AlNb (O-alloys) developed within Russia and abroad. Phase diagrams typical for alloys based upon Ti–Al–Nb and general data for the phases formed in these alloys are provided. Concepts of aluminum and niobium equivalents used for multicomponent alloys are considered. The effect of alloying elements on a combination of mechanical properties of O-alloys, alloying principles, and compositions of the alloys developed are summarized. Characteristics of phase transformations occurring within alloys during heat treatment, including continuous heating and isothermal treatment, are provided. Typical microstructures of the alloys are presented; processing methods for their production and the influence of structural parameters on a combination of properties are described. Methods for manufacturing and processing routes of O-alloys are presented, which provide a good set of properties at room and elevated temperatures, as well as possible operating temperatures for refractory use. [ABSTRACT FROM AUTHOR]

Published
2023
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46. Fiber vs Rolling Texture: Stress State Dependence for Cold-Drawn Wire.

Author

Zorina, M. A., Karabanalov, M. S., Stepanov, S. I., Demakov, S. L., Loginov, Yu. N., and Lobanov, M. L.

Subjects
COPPER wire, ROLLING (Metalwork), ELECTRON backscattering, STRAINS & stresses (Mechanics), MATERIALS texture, SHEAR (Mechanics)
Abstract

The texture of the cold-drawn copper wire was investigated along the radius using electron backscatter diffraction. The complex fiber texture of the central region of the wire was considered as the rolling texture consisting of a set of preferred orientations. The texture of the periphery region was revealed to be similar to the shear texture. The orientation-dependent properties of the wire were proven to be determined by the texture of the near-surface layers. [ABSTRACT FROM AUTHOR]

Published
2018
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