Publications on the project |
082 SHS reactions in nanosized multilayers: Analitical Model versus numerical one |
Authors: | T.V. Zaporozhets, A.M. Gusak, A.I. Ustinov | |
Summary: | | |
Keywords: | | |
Edition: | International Journal of Self-Propagation High-temperature Syntesis | | | 2010,
vol.19, №4, pp. 227-236,English |
082 EFFECT OF NANOFOIL OF THE Ni-NbC SYSTEM ON STRUCTURE OF ELECTRON BEAM WELDS IN HEAT-RESISTANT ALLOYS |
Authors: | K.A. YUSHCHENKO, A.I. USTINOV, B.A. ZADERY | |
Summary: | The effect of niobium carbide nanoparticles on structure and properties of electron beam welds in nickel alloys was studied. Alloying of the weld metal with niobium carbide nanoparticles was performed by adding composite nanostructured foil of the Ni-NbC system into the weld pool. The foil was produced by electron beam evaporation of the components in vacuum, followed by combined deposition of their vapour flows on the substrate. Adding the niobium carbide nanoparticles into the weld pool was shown to lead to formation of crystalline grains with a cellular structure within the weld zone, with the NbC particles located along the boundaries of the above grains. The effect of this structure of the welds on their mechanical properties was analysed. | |
Keywords: | electron beam welding, electron beam evaporation, nickel alloy, weld, foil, alloying, modification, niobium monocarbide, nanoparticles, intragranular substructur | |
Edition: | Avtomaticheskaya Svarka | | | 2010,
№11, с.5-11,Russian |
082 Modeling of stationary mode of SHS reaction in nanolayer materials (phenomenological model). 1. Single-stage reaction. |
Authors: | Zaporozhets T. V., Gusak A. M., Ustinov A. I. | |
Summary: | Self-consistent by a temperature profile and simplified analytic models of stationary mode SHS in multi-layer nanostructure based on application of kinetics of a reaction growth of phases in thin films under non-isothermal conditions are offered. | |
Keywords: | | |
Edition: | Sovremennaya Elektrometallurgiya | | | 2010,
№1, с. 40-46,Russian |
082 DIFFUSION BONDING OF γ-TiAl BASE ALLOY IN VACUUM BY USING NANOLAYERED INTERLAYERS |
Authors: | G.K. KHARCHENKO, A.I. USTINOV, Yu.V. FALCHENKO, A.N. MURAVEJNIK, T.V. MELNICHENKO and L.V. PETRUSHINETS | |
Summary: | The effect of nanolayered interlayers Ti/Al, Ni/Ti and Ni/Al on structure of the diffusion bonds made in vacuum on γ-TiAl base alloy was studied. It is shown that when using the nanolayered interlayers of a composition differing from that of the base alloy it is necessary to conduct homogenising annealing to lower the degree of chemical heterogeneity in the bonding zone. | |
Keywords: | diffusion bonding in vacuum, intermetallic titanium-aluminium alloy based on γ-TiAl, nanolayered interlayer, homogenising annealing, joint, heterogeneity, structure, microhardness | |
Edition: | The Paton Welding Journal | | | 2011,
№3. – С. 2 – 6,English |
082 Conditions of propagation of the SHS reaction front in nanolayered foils in contact with heat-conducting material |
Authors: | Zaporozhets T.V., Gusak A.M. and Ustinov A.I. | |
Summary: | The problem of propagation of the gas-free combustion (SHS reaction) front in nanolayered foils in thermal contact with the mating surfaces is considered. It is shown that dependence of the rate of propagation of the combustion front on the intensity of heat removal is of a threshold nature: there are critical values of the intensity of heat removal at which the combustion conditions in the nanolayered foil-heat-conducting material system are suppressed. | |
Keywords: | welding and brazing, multilayer foils, heat-conducting materials, mating surfaces, self-propagating high-temperature synthesis reaction, heat removal, threshold thickness, analytical estimation | |
Edition: | The Paton Welding Journal | | | 2011,
№8, Pages 37-41,English |
082 Peculiarities of resistance welding of copper with aluminium alloys using nanostructured foil of Al—Cu system |
Authors: | Kuchuk-Yatsenko V.S. | |
Summary: | Peculiarities of formation of welded joints of AD1 aluminium alloy with M1 copper using nanostructured foil of Al-Cu system as an insert are considered. Microstrucutre and chemical heterogeneity of welded joint metal were studied and mechanical rupture testing of welded joints was performed. | |
Keywords: | resistance butt welding, nanostructured foil, eutectics, microstructure, intermetallics | |
Edition: | The Paton Welding Journal | | | 2011,
№5 Pages 28-30 ,English |
082 Flash-butt welding of high-temperature nickel alloy using nano-structured foils |
Authors: | Kuchuk-Yatsenko V.S. | |
Summary: | The process of resistance flash-butt welding of high-temperature nickel alloy Rene 80 using nano-structured foils of Ti-Al and Ag-Cu system is considered. Features of welded joint formation and their microstructure are studied. Microhardness distribution in welded joints is shown. | |
Keywords: | flash-butt welding, high-temperature nickel alloy, lack-of-penetration, microcrack, nano-structured foil, base metal, heat-affected zone, microhardness distribution, microstructure | |
Edition: | The Paton Welding Journal | | | 2011,
№11 Pages 12-15 ,English |
082 Multilayer TI/ Al foils: methods of producing, properties and application in pressure welding. |
Authors: | Ustinov A. I., Falchenko Yu. V., M elnichenko T. V., Kharchenko G. K., Petrushinets L. V., Shishkin E. A. | |
Summary: | An electron beam method is presented for producing multi-layer foils on the base of intermetallide-forming base. Results of application of mentioned foils as intermediate interlayers in diffusion welding of titanium aluminides are considered. | |
Keywords: | | |
Edition: | Sovremennaya Elektrometallurgiya | | | 2012,
№ 1, c. 30-37 ,Russian |
082 Vacuum diffusion welding of γ-TiAl intermetallic alloy to 12Kh18N10T steel |
Authors: | Kharchenko G.K., Ustinov A.I., Falchenko Yu.V., Petrushinets L.V., Grigorenko S.G., Kostin V.A. and Gurienko V.P. | |
Summary: | A two-stage technology for vacuum diffusion welding of intermetallic alloy g-TiAl to 12Kh18N10T steel using interlayers has been developed. It is shown that application of a nanolayered interlayer of Ti-Al system from the side of intermetallic and nickel interlayer from the side of steel provides a uniform distribution of microhardness in the bond. | |
Keywords: | vacuum diffusion welding, g-TiAl intermetallic alloy, 12Kh18N10T steel, nanolayered insert, joint zone, microstructure, microhardness | |
Edition: | The Paton Welding Journal | | | 2012,
№4 Pages 12-14 ,English |
082 Deformational behaviour of multilayer Ti/Al foils at heating under the conditions of continuously applied loads |
Authors: | Ustinov A.I., Melnichenko T.V., Shishkin A.E. | |
Summary: | It is shown that multilayer Ti/Al foils can undergo plastic deformation at heating under the conditions of continuously applied tensile load not exceeding the yield limit. It is es
tablis he d that phase transformations at heating and multilayer
foil structure have an essential influence on mechanical prop
erties that is manifested in nonmonotonic change of the
extent of plastic deformation at continuous load, depend
ing on temperature. Two temperature intervals, in which
intensive plastic deformation of the foil proceeds: low-
temperature (350—650 °C) and high-temperature (above 700 °C) one, are determined. Nonmonotonic influe
nce of heating on plastic flow of multilayer Ti/Al foils under the impact of continuously applied loads in the low-temperature range of their plastic deformation is associated with running of phase transformations in them that are accompanie
d by pore formation, and in the high-temperature range it is due to realization of suplerplastic deformation mechanism in the formed intermetallic foil that becomes possible at such low temperatures due to submicron and nanoscale size of TiAl intermetallic grains and presence of pores in the foil. Features of deformational behaviour of multilayer Ti/Al foil influence the possibility of their practical application in diffusion pressure welding. | |
Keywords: | electron beam deposition; multilayer foil; titanium; aluminium; structure; phase transformations; superplasticity; volume effect; porosity | |
Edition: | Sovremennaya Elektrometallurgiya | | | 2013,
№4, с.27-33,Russian |
082 Inverse problem of SHS in multilayered nanofoils and its application to prediction of SHS parameters in single-stage reaction |
Authors: | T. V. Zaporozhets, A. M. Gusak, Ya. D. Korol, A. I. Ustinov | |
Summary: | | |
Keywords: | | |
Edition: | International Journal of Self-Propagating High-Temperature-Synthesis | | | 2013,
v.22, №4, pp217-216,English |
082 Peculiarities of alloying of weld metal of high-strength aluminium alloy welded joints with scandium |
Authors: | Fedorchuk V.E., Kushnaryova O.S., Alekseenko T.A. and Falchenko Yu.V. | |
Summary: | The problem of effect of solidification rate on structure of weld metal of scandium-containing aluminium alloys is considered. Peculiarities of scandium precipitation from melt in solidification of aluminium alloys under non-equilibrium conditions, simulating fusion welding, are investigated. Procedure of investigations has been developed and confirmed experimentally. Advantage of offered procedure over the existing ones consists in the fact that it allows simulate almost all the methods of fusion, from argon arc non-consumable electrode welding to electron beam welding. It is shown that the procedure satisfies the put aims completely. Microstructural investigations of ingots in height showed that within the interval of solidification rates from 103.3 to 102.5 °C/s the change of form of solidification occurs from dendritic to subdendritic ones. It was found that at rates of solidification, commensurable with solidification of weld metal, up to 0.41%Sc can be contained in solid solution of alloys. When applying the highly concentrated power sources, such as electron beam, it is possible to reach the similar value also in welds. In arc methods of welding approximately 0.3 % Sc can be assimilated in solid solution of weld metal. It was found that it is necessary to provide its content in weld metal at the level of 0.35-0.40wt.% to maximization of effect from alloying of welds with scandium. In this case the increase in mechanical properties of weld metal is provided both by refining of its crystalline structure, and also by hardening the solid solution by scandium. 7 Ref., 3 Tables, 4 Figures. | |
Keywords: | high-strength aluminium alloys, scandium, alloying, weld metal, modifying of cast structure | |
Edition: | The Paton Welding Journal | | | 2014,
№5 Pages 28-32,English |
082 Influence of heating rate on inflammation temperature of mutlilayer Ti/Al foil |
Authors: | Kuzmenko D.N., Ustinov A.I., Kosintsev S.G. and Petrushinets L.V. | |
Summary: | Self-sustaining exothermal reaction of synthesis in multilayer foil consisting of intermetallic forming elements may proceed by means of self-propagation of high-temperature synthesis reaction front through foil (self-propagating high-temperature synthesis (SHS) or as a result of synthesis reaction running through the entire volume (autoinflammation (AI)). The latter is realized under the condition of foil heating up to a certain critical temperature, at which the synthesis reaction runs in the entire volume without external heat supply. In the work influence of foil heating rate on AI temperature was studied in the case of Ti/Al multilayer foil. It is shown that there exists a certain critical heating rate, below which foil AI is not observed, and at heating rates above the critical rate AI temperature decreases with increase of heating rate. Dependence of AI temperature on heating rate is nonmonotonic: at low heating rates AI temperature abruptly decreases, and at further increase of heating rate AI temperature remains practically unchanged. Such nonmonotonic dependence of foil AI temperature on heating rate is associated with running of the process of thermally activated solid phase reactions in it, which are accompanied by formation of intermetallic interlayers on the boundary between titanium and aluminium layers, preventing diffusion mixing of elements. With increase of heating rate, interlayer thickness decreases, promoting AI temperature lowering. 11 Ref., 4 Figures. | |
Keywords: | multilayer foil, autoinflammation, electron beam vacuum deposition, thermal explosion, heat evolution | |
Edition: | The Paton Welding Journal | | | 2014,
№10 Pages 22-25,English |
082 Force effect on welded surfaces initiated by running of SHS reaction in nanolayered interlayer |
Authors: | Velikoivanenko E.A., Ustinov A.I., Kharchenko G.K., Falchenko Yu.V., Petrushinets L.V. and Rozynka G.F. | |
Summary: | The case of welding samples of titanium aluminide through nanostructured Ti/Al interlayer was used to calculate stresses arising in the surface layers of welded intermetallide samples, initiated by intensive heat evolution at running of the reaction of self-propagating high-temperature synthesis in the interlayer. | |
Keywords: | welding, nanolayered interlayer, reaction of self-propagating high-temperature synthesis, thermal stresses | |
Edition: | The Paton Welding Journal | | | 2011,
№7 Pages 7-10 ,English |
082 Development of new titanium bio-compatible alloys for medical application |
Authors: | Topolsky V. F., Akhonin S. V., Grigorenko G. M ., Petrichenko I. K.
| |
Summary: | Mechanical characteristics of vanadium-free titanium alloys of different systems of alloying developed in Ukraine and designed for manufacture of different products of medical purposes are presented. The high level of biological compatibility and corrosion resistance of developed titanium alloys is shown. Analyzed are the structural-phase composition of new titanium alloys after thermomechanical treatment, as metal of well as their welded joints. The capability of production of these alloys by the method of electron beam cold hearth melting was confirmed. Physical and chemical properties of developed titanium alloys stipulate their wide application in orthopedy and stomatology. | |
Keywords: | | |
Edition: | SOVREMENNAYA ELEKTROMETALLURGIYA | | | 2012,
№1. –С. 22-25,Russian |
082 Experimental study and modelling of thermal-deformation processes occurring in welded joints on nickel superalloys |
Authors: | Yushchenko K.A., Romanova V.A., Balokhonov R.R., Savchenko V.S., Chervyakov N.O. and Zvyagintseva A.V. | |
Summary: | Results of experimental and numerical investigations of the processes of deformation and fracture of welded joints on nickel superalloys under conditions of mechanical and thermal loading are presented. Structural transformations were investigated, and thermal-deformation processes in the heat-affected zone (HAZ) during the welding cycle process were evaluated. The mechanisms of initiation and propagation of hot cracks in the HAZ metal near the fusion line were determined, and local plastic strains under the thermal cycle condition were assessed. Evolution of the stress-strain state in the HAZ metal was analysed in terms of physical mesomechanics, and conclusions on the role of grain boundaries in the processes of initiation and propagation of cracks were made. | |
Keywords: | arc welding, nickel superalloys, welded joints, thermal loading, inter-grain boundaries, hot cracks, numerical modelling | |
Edition: | The Paton Welding Journal | | | 2012,
№10 Pages 2-9 ,English |
082 Dispersion-strengthened titanium alloys of Ti-Si-X system |
Authors: | Grigorenko G. M ., Akhonin S. V., Taranova T. G., Grigorenko S. G.,
Zadorozhnyuk O. M . | |
Summary: | Results of investigations of experimental alloys of Ti-Si-X system are presented, the interest to which was shown by the challenge of their application in aircraft industry and rocketry. Ingots of experimental titanium alloys were manufactured by the method of electron beam crucible melting with electromagnetic stirring, which allows producing the homogeneous melt and ingots, homogeneous in chemical composition, after cooling. Using the methods of light metallography, such as SEM, Auger-spectroscopy, the structure and properties of wrought titanium alloys of Ti-Si-X system with dispersion strengthening were examined. It was found that the presence of fine-dispersed strengthening particles of nanosizes,having non-homogeneous chemical composition in section, promotes the increase in strength. | |
Keywords: | | |
Edition: | SOVREMENNAYA ELEKTROMETALLURGIYA | | | 2012,
№ 1, c. 45-52 ,Russian |
082 Mathematical simulation of the processes of evaporation in melting ingots of multicomponent titanium alloys in electron beam cold hearth installations |
Authors: | Akhonin S.V., Severin A.Yu., Berezos V.A., Erokhin A.G. | |
Summary: | A mathematical model was constructed, which correlates concentration of aluminium and other alloying components in an ingot of multicomponent titanium alloy, produced by electron beam cold-hearth melting, with technological parameters of meting, initial charge composition and physico-chemical constants of the titanium alloy. Adequacy of the constructed mathematical model has been verified, and influence of technological parameters of melting and initial charge composition on chemical composition of the produced ingots is analyzed in the case of producing an ingot of titanium aluminide alloy Ti—29Al—12Nb—3Cr—3Zr by the process of electron beam cold-hearth melting. It is shown that the constructed
mathematical model quite accurately describes the actual evaporation process in electron beam melting of titanium aluminide. Relative error of calculation results, compared to experimental data, is from 3.2 for aluminium up to 7.3 % for zirconium. Developed mathematical model of evaporation allows prediction of chemical composition of produced ingots of multicomponent titanium alloys, and can be used in production to manufacture ingots of a guaranteed composition by EBM process. Ref. 12, Table 1, Figures 7. | |
Keywords: | electron beam melting; ingot; evaporation; mathematical simulation; melting rate; titanium alloys, titanium aluminide; alloying elements | |
Edition: | SOVREMENNAYA ELEKTROMETALLURGIYA | | | 2013,
№ #4, с. 34-39,Russian |
082 Temperature stresses in instantaneous heating of contacting surfaces |
Authors: | I.O. Prybytko, L.V. Petrushinets, G.K. Kharchenko, Yu. V. Falchenko | |
Summary: | | |
Keywords: | | |
Edition: | Visnyk of Chernihiv State Technological Univercity | | | 2011,
№47. – С. 55 – 61.,Ukrainian |
082 Diffusion welding of γ-TiAl based alloy to VT6 titanium alloy |
Authors: | G.K. Kharchenko, Yu. V. Falchenko L.V. Petrushinets | |
Summary: | | |
Keywords: | | |
Edition: | Visnyk of Chernihiv State Technological University | | | 2012,
№1(55), С. 131 – 135,Ukrainian |
082 Diffusion welding of titanium aluminide alloy to stainless steel |
Authors: | G.K. Kharchenko, Yu. V. Falchenko, L.V. Petrushinets | |
Summary: | | |
Keywords: | | |
Edition: | Visnyk of Chernihiv State Technological University | | | 2012,
№2(57), С. 81 – 84.,Ukrainian |
The events in the framework of the project |
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082 3.2. Scientific and technological foundations of permanent joints materials using nanostructured layers and severe plastic deformation in the joint zone Purpose: Expected results:Release of new product: material Stage 1:Розробка методик електронно-променевого осадження наношаруватих фольг при незмінних технологічних параметрах та визначення їх реактивних характеристик, обґрунтування методології експериментальних і фундаментальних досліджень щодо можливості з'єднання однорідних та різнорідних металевих та композиційних матеріалів Stage 2:Експериментальне та теоретичне дослідження впливу характеристик мікроструктури на реактивну здатність наношаруватих фольг, дослідження особливостей виділення тепла та процесів масопереносу в зоні контакту однорідних та різнорідних металевих та композиційних матеріалів при імпульсному нагріванні електричним струмом і використанні наношаруватих плівок та компактних прошарків Stage 3:Дослідження впливу характеристик мікроструктури реактивних наношаруватих фольг на їх деформаційну поведінку при неперервному нагріванні в умовах постійно діючих зовнішніх навантажень, визначення закономірностей фазових перетворень, морфології структурних складових в зоні з'єднання в процесі імпульсного нагрівання матеріалів при використанні наношаруватих плівок та компактних прошарків, встановлення їх впливу на властивості з'єднань Stage 4:Створення кількісної моделі опису реактивної поведінки наношаруватих фольг в процесі протікання ВСС, встановлення ефективності застосування наношаруватих плівок та компактних прошарків при з'єднанні у твердій фазі сучасних конструкційних матеріалів з метою отримання якісних швів Stage 5:Розробка методики визначення характеристик мікроструктури наношаруватої фольги з заданою реактивною здатністю та пластичністю при неперервному нагріванні в умовах постійно діючих навантажень, узагальнення результатів експериментальних і фундаментальних досліджень, розробка технологій неро'ємного з'єднання сучасних та перспективних конструкційних матеріалів з використанням наношаруватих плівок і компактних прошарків
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