Kramators’k, Ukraine
Kramators’k, Ukraine

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Vlasov A.F.,Donbas State Engineering Academy | Makarenko N.A.,Donbas State Engineering Academy | Kushchiy A.M.,Donbas State Engineering Academy
Welding International | Year: 2017

An exothermic flux with electrical conductivity in the solid state and producing rapidly a slag pool of the required volume in the starting period of the electroslag process with a ‘solid’ start instead of a ‘liquid’ start is developed. The chemical composition of the reduced metal equivalent to the standard composition of 9KhF steel is described. In comparison with the existing methods of producing a slag pool, the electroslag processes using exothermic alloyed flux with the ‘solid’ start increase the yield of suitable metal by 2–7%, save 1.2–1.4 kWh for melting 1 kg of standard flux and reduce the duration of the starting period of the electroslag process by 25%. © 2017 Informa UK Limited, trading as Taylor & Francis Group.

Turchanin M.A.,Donbas State Engineering Academy | Bondar A.A.,Frantsevich Institute for Problems of Materials Science | Dreval L.A.,Donbas State Engineering Academy | Abdulov A.R.,Donbas State Engineering Academy | Agraval P.G.,Donbas State Engineering Academy
Powder Metallurgy and Metal Ceramics | Year: 2014

The mixing enthalpies of ternary liquid alloys in the Cu-Fe-Co system have been studied by calorimetric method at 1873 K and x Cr = 0-0.45. The phase transformations in the Cu-Fe-Cr system have been examined using methods of physicochemical analysis. The thermodynamic assessment of the ternary system has been carried out in the framework of the CALPHAD method. The set of self-consistent parameters for thermodynamic models of the phases has been obtained taking into account experimental data of the present work and information on phase transformations. The isothermal and vertical sections of the phase diagram, liquidus and solidus surfaces, as well as metastable miscibility gaps of supercooled liquid alloys have been calculated. The degrees of supercooling for metastable liquid phase immiscibility have been assessed. The composition ranges for the formation of alloys with special structures have been predicted. The temperature-composition ranges for the formation of supersaturated solid solutions during liquid quenching have been evaluated. © 2014 Springer Science+Business Media New York.

Chigarev V.V.,Mariupol State University | Gavrish P.A.,Mariupol State University | Gribkov E.P.,Donbas State Engineering Academy
Welding International | Year: 2014

The proposed automated program takes into account changes in the geometrical parameters during drawing, the mechanical properties and the contact friction conditions along the length of the deformation zone, and also the conditions of plastic deformation of the shell and the fracture parameters of the shell. It is shown to be possible to produce defect-free flux-cored wires at the minimum number of passes. © 2014 © 2013 Taylor & Francis.

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