Materials science
Prospects for calculating the chemical composition and mechanical properties of new titanium alloys for various industrial industries
I.S. Polkin, A.V. Alexandrov, Yu.B. Egorova, L.V. Davydenko, S.B. Belova, S.V. Lednov
Based on a statistical approach, principles for calculating the chemical composition and mechanical properties of titanium alloys are proposed depending on the structural equivalents of aluminum and molybdenum and their ratio. Models have been developed to substantiate the chemical composition of new titanium alloys, ensuring a given level of mechanical properties after annealing. It is statistically proven that by optimizing solid solution strengthening, the strength of existing titanium alloys can be increased by 10–15%.
Keywords: titanium alloys, semi-finished products, chemical composition, aluminum and molybdenum equivalents, annealing, mechanical properties, prediction.
The influence of the chemical composition of deformable titanium alloys on the decorative possibilities of thin oxide films obtained during anodizing
A.E. Avramenko, A.E. Dryukova
The article examines the influence of the chemical composition of titanium alloys on their decorative capabilities, namely on the size of the palette (the number of colors obtained) and its saturation, which is estimated according to the MKO system. For the obtained results, the possible causes of the positive or negative effects of ligature and impurities on the investigated possibilities have been studied. Since the best film parameters are observed with minimal structural defects, the influence of the chemical composition of the alloy was evaluated in terms of structural changes caused by impurity defects of both the alloy itself and the oxide film formed on it.
Keywords:decorative oxide films, titanium alloys, anodizing.
Identification of lanthanides relative to the endurance limit
S.V. Serikov
In the article, using the computational and experimental method of identifying metals already known from publications, a quantitative analysis of the assessment of the endurance limit of rare earth metals from the lanthanide group is performed. Using the example of ten elements, their individual characteristics regarding operational reliability are identified. It has been shown that the level of work of destruction of the elements: Dysprosium, Cerium, Neodymium is an order of magnitude higher compared to Erbium and Holmium. Studies of changes in the coefficient of dynamic viscosity and specific work of fracture depending on the test temperature.
Keywords: lanthanide group, metal identification, strain rate, mechanical properties, impact strength, temperature.
Characteristics of shape memory effect in industrial titanium alloy VT16
D.E. Gusev, M.Yu. Kollerov, O.S. Alsaeva, A.V. Shalin
The features of the structure and thermomechanical behavior of VT16 alloy samples subjected to annealing in the b-region followed by quenching from the (a+b)-region are investigated. To realize the effect of shape memorization, the studied samples were subjected to precipitation by the amount of residual deformation from 2.2 to 3.8%. It was found that when the samples are heated in the temperature range from 45 to 250 ° C, a partial restoration of the shape (from 1.1 to 0.8%) occurs due to the reverse martensitic transformation, and at temperatures above 270 ° C, deformation accumulates due to the diffusion decay of the b-phase.
Keywords: titanium alloys, shape memory effect, restored deformation, martensitic transformation, diffusion, phase composition.
Influence of heat and thermal hydrogen treatments on VT23 titanium alloy structure and mechanical properties
O.N. Gvozdeva, A.V. Shalin, A.S. Stepushin, P.A. Smirnov, A.S. Zhurbenko
The influence patterns of different types of treatments on the VT23 titanium alloy structure formation and mechanical properties were studied. The possibilities of structural components morphology and size changing by controlling the temperature-time parameters of such treatments are shown. It was established that a large-lamellar structure with α-lamellae longer than 20 μm is formed in the alloy during cooling from the β-region at a rate of 0.01 K/s, and a fine-dispersed (α+β)-structure with a α-particle size of no more than 0.3 μm is formed during thermal hydrogen treatment with low-temperature vacuum annealing.
Keywords: titanium alloy, phase composition, structure, morphology, mechanical properties, deformation, heat treatment, thermal hydrogen treatment.
Manufacturing technologies
Control of the electrode gap during vacuum arc melting and the use of the ZIIOT digital platform for control and analysis of the melting process
P.S. Altman, A.A. Karasev, I.M. Kolobov, A.V. Konyashin, A.Yu. Tashkinov
The application of the Digital Platform ZIIOT for organizing the process of collection, processing and storage of process data during vacuum-arc remelting of highly reactive metals is considered. Application of Platform's microservice architecture allows real-time analysis of big data and correction of technological parameters with automatic formation of the melting passport.
Keywords: electrode gap, refractory metals, Kalman filter, unified digital platform, microservice architecture.
Processing technologies
Hardware implementation of microarc oxidation of titanium alloys
A.A. Zhukov, S.V. Zhukov, I.A. Nikolaev, V.K. Shatalov, A.O. Shtokal, E.V. Rykov
The relevance of the study of technological equipment for performing micro-arc oxidation (MAO) of titanium alloys in the rocket and space industry is noted. Open publications on the features of equipment for performing MAO of titanium alloys in domestic and foreign literature are analyzed. Three areas of research on technological equipment are noted: modeling of processes occurring during MAO of titanium alloys, to build a model of an installation that performs MAO; expanding the technological capabilities of the MAO method of titanium alloys through the development of additional devices; improvement of the designs of existing installations and equipment based on theoretical knowledge about the MAO process of titanium alloys. The priority task of widespread introduction of MAO methods into rocket and space production has been formed.
Keywords: microarc oxidation, titanium alloy, technological equipment, rocket and space production, electric model, large-sized part.
