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Electrometallurgy Today, 2004, №04

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2004 №03 2005 №01

Electrometallurgy Today 2004 #04

CONTENTS



ELECTROSLAG TECHNOLOGY
Paton B.E., Medovar L.B. and Saenko V.Ya. About prospects of bimetal production using electroslag process 2
The role of electroslag welding process in producing bimetal ingots for manufacturing sheets and rolled sections is shown. Specifics of manufacture of bimetal section semi-products by rolling in section mills of square two-layer ingots, produced by the method of cladding using mandrels of different shapes, and also by rolling and hot pressing of composite round two-layer billets, is considered. The feasibility of use of the electroslag process with a liquid metal in the production of bimetal ingots in ESR furnaces, including also the method of a continuous electroslag casting, is evaluated.
Troyansky A.A., Ryabtsev A.D., Mastepan V.Yu. and Samborsky M.V. Application of harmonic analysis of electric parameters for monitoring and control of ESR process 7
The feasibility of application of harmonic analysis for monitoring of the process of a chamber-type ESR is shown. Values of coefficients of harmonics are given for remelting using fluxes ANF-6, ANF-1P, pure CaF2 and CaF2ДCa system. It was suggested to use the information, obtained by this method, in automated systems of the ESR technological process control.
Biktagirov F.K. and Krikent I.V. Specifics of thermal interaction between slag and metal under conditions of electroslag heating 10
Laws of heat generation and mass transfer in slag pool at different diagrams of current supply were studied on the mathematical models relative to the non-consumable electroslag process. It is shown that to improve the heat transfer from slag to metal at a bifilar diagram of current supply, as well as at a three-phase diagram, it is necessary to keep certain geometric proportions of arrangement of electrodes in the slag melt. Experimental investigations of heat balance in electroslag heating of metal confirmed the calculated results.
ELECTRON BEAM PROCESSES
Trigub N.P., Akhonin S.V. and Pikulin A.N. Electron beam surface melting of zirconium ingots 15
This article presents technology of electron beam surface melting of cylindrical zirconium ingots and experimental determination of optimum technological parameters. Metallographic analysis of ingots showed that surface melted layer is characterized by the absence of macropores, discontinuities and other defects of casting origin.
Antonov S.N., Revenok V.P., Zhuravlyov A.V., Antipieva N.V., Kopylova N.E., Petrov V.D., Kalinyuk A.N. and Kozlovets O.N. Manufacture of titanium pipes from metal produced by EBCHM method 18
At CJSC "SETAB Nikopol Works", the cold-worked pipes, made of ingots, produced from titanium alloy PT-1M using the method of electron beam cold hearth melting at R&P Center "Titan" of the E.O. Paton Electric Welding Institute of the NAS of Ukraine, were manufactured. By its properties the forged billet, produced from these ingots, meets the requirements of TS 1-5-132Д78. Cold-worked pipes, manufactured from it, satisfy the requirements of GOST 22897Д86 and TS 14-3-820Д79. Quality of the surface, content of impurities, mechanical and technological properties of ready pipes are similar to the same characteristics for the pipes manufactured from the VAR metal.
PLASMA-ARC TECHNOLOGY
Zhadkevich M.L., Shapovalov V.A., Telin V.V., Teslevich S.M., Konstantinov V.S., Torkhov G.F. and Burnashev V.R. Study of gas phase composition in plasma-arc melting of titanium from a pressed billet 21
Composition of gas atmosphere was studied in melting of a pressed spongy titanium billet. It was established that content of hydrogen and moisture in the zone of melting is changed depending on the rate of billet melting, grade of spongy titanium, consumption of plasma-forming gas, terms of storage of a pressed billet.
Shapovalov V.A., Nikitenko Yu.A. and Burnashev V.R. Application of bottom pouring in plasma-arc skull melting 25
The article describes feasibility of application of a bottom pouring out of metal in use of refractory ceramic materials and plasma-arc melting in a copper water-cooled crucible, and also protection of the copper crucible from the action of a direct plasma flow.
VACUUM-ARC MELTING
Panov A.N. Defining of perspective trends in designing of large-capacity furnaces for production of large-sized titanium castigs 29
From results of investigations the most rational variant of design of a skull 7 t capacity furnace was defined. Possible variants of large-capacity furnaces and rationality of their design from the point of view of nature of melting the different-diameter consumable electrodes and thermal and hydrodynamic processes proceeding in molten pool of crucible of different capacity were considered.
GENERAL PROBLEMS OF METALLURGY
Prikhodko E.V. and Moroz V.F. About effect of atomic interaction in melts on solubility of gases and carbon in them. Part2. Solubility of hydrogen and oxygen. General conclusions 33
Using models of metal melts with BCC-like structure, the solubility of carbon, hydrogen, nitrogen, oxygen and other gases in metal and salt solutions was studied. Close correlations between the solubility and integral parameters of atomic interaction were established which allow numerical prediction of solubility of gases and carbon in metal and salt melts of different composition.
ELECTROMETALLURGY OF STEEL AND FERROALLOYS
Karpov V.V. About feasibility of producing gasars using methods of electrometallurgy 40
Experiments have been carried out that confirm the feasibility of use of electric arc melting for producing composite materials such as gas-reinforced refractory metals (gasars). Effect of process parameters on arc stability and formation of structure of gasars was determined.
ENERGY AND RESOURCE SAVING
Lakomsky V.I. and Lebedev V.A. Dependence of contact electric resistance of thermoanthracite on temperature and pressure 42
Constituents of contact electric resistance of thermoanthracite are studied. It is shown how great effect of adsorbed moisture can be exerted on contact resistance of a crushed thermoanthracite. Dependence of electric resistance of contact of thermoanthracite on pressure was obtained.
Lakomsky V.I. Volt-ampere characteristic of thermoanthracite contacts 44
Volt-ampere characteristics of contacts between grains of thermoanthracite under the conditions of pulsed and stationary electric supply of the latter were obtained for the first time. It is shown that VAC of thermoanthracite contacts in the isothermal conditions of measurements is straight-linear and passes through the origin of coordinates.
Index of articles for AEM'2004, Nos. 1Д4 47
List of authors 48


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