Raw materials. Titanium sponge
Recovery of titanium from its tetrachloride by calcium dissolved in molten CaCl2
V. Lebedev, A. Babin, V. Polyakov, D. Rymkevich, I. Bezdolya
In the experimental workshop of AVISMA branch of OJSC "Corporation VSMPO-AVISMA" experiments on the recovery of titanium from its tetrachloride by calcium, dissolved in molten CaCl2 were carried ont. It is shown that when enough of the reducing agent in СаС12 soluble chlorides of titanium of a lower valence, mainly TiCl2 are formed. Upon dissolution of the frozen float in water causes oxidation of the ions Ti2+ to the trivalent state, accompanied by heating of the solution and evolution of hydrogen. In the solid residue the intermediate reduced forms of oxygen-containing compounds mainly Ті2О, TiO, Ti4Fe2O0,4 are present, gives metallic luster to a Deposit. An excess of reducing leads to complications associated with the washing of slightly water-soluble compounds of Ca(OH)2, CaCO3, resulting from the interaction of Ca with water.
Keywords: titanium tetrachloride, the melt Ca-СаС12, powders of titanium, chemical, x-ray diffraction, particle size analysis.
Variants of processing technologies and employment of low-quality titanium sponge
G. Kolobov, V. Skachkov, V. Panova, O. Bubinets, A. Prohorova
Main directions of processing and using of low-quality titanium sponge in order to obtain useful products from it are as follows: production of Ti-contained steels, ferrotitanium, titanium powders, ingots of economically alloyed titanium alloys, magnesium refining, obtaining of protective coatings, refractory titanium compounds, lower titanium chlorides.
Keywords: titanium sponge, steel deoxidation and alloying, ferrotitanium, powders, ingots of titanium alloys, products, refining, coatings, titanium hydride, titanium carbide, carbide-steels, lower titanium chlorides.
Influence of gadolinium additional alloying on structure and properties of a pilot heat-resistant titanium alloy in cast and deformed state
I. Grushin, S. Skvortsova, K. Speranskiy, A. Demakov, N. Mamontova
The influence of different gadolinium content on the structure and properties of a pilot heat-resistant near-alpha titanium alloy was studied in this work. It was stated that introduction of gadolinium into the alloy resulted in a change of intragranular cast structure, predominance of the nucleation process over the growth process at cooling the alloy after deformation, and contributed thereby to dispersion of the structure, slowing down oxidation rates and increase in cyclic durability.
Keywords: heat-resistant titanium alloy, phase composition, phase equilibria, structure, rare-earth metals (REM), gadolinium.
Investigation of crystallization structure in Ti-10V-2Fe-3Al alloy during vacuum arc remelting
E. Kondrashov, M. Leder, K. Rusakov
In this work we considered the method of evaluating thermalphysic parameters of titanium alloys needed for mathematical modeling of ingot solidification during vacuum arc remelting (VAR). Transition from the columnar solidification structure to the equiaxed one in Ti-10V-2Fe-3Al alloy during VAR was investigated experimentally and in theory. Heat treatment mode was determined which makes it possible to reveal dendritic crystallization structure in several parts of the ingot.
Keywords: vacuum arc remelting, titanium alloys, columnar structure, equiaxed structure, dendrite, modeling.
Semi-products manufacturing technologies
The use of granule metallurgy titanium alloys for the production of new materials and products with improved characteristics
A.A. Alexandrov, A.V. Alexandrov, G. Demchenkov, S. Kyznetsov, S. Osipov,
The article describes the state of the powder metallurgy of titanium, the characteristics of the titanium granules obtained in installations of centrifugal atomization (UCR) of the old generation and the modern equipment of the type UCR-9 and information about their quality. Showing the advantages of manufacturing parts from titanium alloy granules and their use in the production of composite heterogeneous materials.
Keywords: titanium alloy, granule, powder, fraction, part.
Semi-products treatment technologies
Investigation of influence of conditions of thermo mechanical processing on the crystallographic texture, mechanical and ballistic properties sheets sparingly titanium alloy
A. Zhloba, M. Leder, A. Berestov, A. Illarionov
The study was conducted to determine the most favorable crystallographic texture and structure of the sheet to obtain the desired ballistic properties of sheets of two-phase titanium alloy sparingly with Fe content up to 2%.
Formation of a microstructure, a crystallographic texture, mechanical and ballistic properties was examined according to the thermo mechanical processing techniques applied 9,1 mm thick sheets.
Keywords: titanium alloy is a martensitic class, breaking through the limit, crystallographic texture, localization of deformation, the degree of deformation in the two-phase region.
Development of laser processing technologies of titanium alloys and their industrial application at production of high-precision large-size constructions of a special application
A. Sukhov, M. Malysh, S. Shanchurov
The industrial technology of high-precision large-size constructions including laser cutting, forming, laser welding of details from titanium alloys, assembly and control of geometry are developed. The complex of mechanical testing of the welded joints from PT-3V alloy is carried out. The technology provides fulfillment of requirements of design documentation, development of serial production in short terms and is implemented in case of production of products of a special purpose.
Keywords: laser welding, laser cutting, titanium alloys, high-precision large-size constructions.
The regularities of thermomechanical behavior of titanium nickelide actuators
M. Kollerov, A. Burnaev, D. Gusev, A. Sharonov
The possibilities of the development of actuators with elements made of shape memory titanium nickelide are considered in this paper. The influence of the scheme and exploitation parameters on the specific work and the temperatures of shape recovery of the elements made of titanium nickelide have been established. It is demonstrated that the performance of such actuators strongly depend on the critical strength and deformations of the material.
Keywords: actuator, titanium nickelide, shape memory effect, superelasticity.
Events and anniversaries
To the 60-year anniversary Mikhail Kollerov