Zaporozhe National University

Zaporozhe, Ukraine

Zaporozhe National University

Zaporozhe, Ukraine

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Girzhon V.V.,Zaporozhe National University | Ovchinnikov A.V.,Kharkiv Polytechnic Institute
Metal Science and Heat Treatment | Year: 2017

X-ray diffraction analysis and light microscopy are used to study the structure of surface layers of helically extruded specimens of titanium alloy VT25U after laser fusion of the surface. It is shown that the rates of cooling of the melt promote formation of a martensitic α″-phase in the zone of laser fusion and of a submicrocrystalline microstructure. The microhardness in the zone of fusion of the initial specimens exceeds the microhardness of the specimens after the extrusion. © 2017 Springer Science+Business Media New York


Grigor'ev S.M.,Zaporozhe National University | Petrishchev A.S.,Kharkiv Polytechnic Institute
Steel in Translation | Year: 2015

The low-temperature treatment of metallized molybdenum concentrate with plasma-forming gas is analyzed. The phase composition, chemical composition, and structure of the refined product are carefully studied. © 2015, Allerton Press, Inc.


Yanovsky A.S.,Zaporozhe National University | Tomilin S.V.,Zaporozhe National University
Journal of Surface Investigation | Year: 2013

Samples representing a system of Pd nanoparticles on a Si surface is obtained. The metal is deposited onto the substrate by thermal evaporation in vacuum. The system of nanoparticles is formed using a thin screen located at an angle to the substrate and by vacuum annealing of ultrathin continuous palladium films. The chemical composition of the deposited substance is studied by Auger electron spectroscopy. The size and topology of the islands on the surface is established by scanning electron microscopy. © 2013 Pleiades Publishing, Ltd.


Grigor'ev S.M.,Zaporozhe National University | Petrishchev A.S.,Kharkiv Polytechnic Institute
Steel in Translation | Year: 2012

X-ray microanalysis is used to investigate the phase composition and microstructure of waste-based alloys with relatively low silicon content, which are intended for use in the production of high-speed steel. Possible reactions and phase transformations at all stages of refining are studied. The physicomechanical properties of the alloy are established. Guidelines are proposed for reducing waste and increasing the assimilation of alloying elements by the steel melt. © 2012 Allerton Press, Inc.


Grigor'ev S.M.,Zaporozhe National University | Petrishchev A.S.,Kharkiv Polytechnic Institute
Steel in Translation | Year: 2012

The phase composition and microstructure of the scale on P6M5Φ3 and P12M3K5Φ2 Steel are studied by X-ray microanalysis. The results are used to improve the utilization of refractory elements from the metal-oxide wastes of high-speed steel. © 2012 Allerton Press, Inc.


Gaivoronskii I.V.,Zaporozhe National University | Girzhon V.V.,Zaporozhe National University | Skrebtsov A.A.,Kharkiv Polytechnic Institute | Ovchinnikov A.V.,Kharkiv Polytechnic Institute
Metal Science and Heat Treatment | Year: 2014

The effect of various modes of laser treatment of sintered powder titanium VT1-0 in an argon environment on the structure and properties of its surface is studied. It is shown that laser fusion of the surface reduces markedly the porosity in the fusion zone. One of the causes of elevation of the microhardness in the surface layers is growth in the total length of grain boundaries. © 2014 Springer Science + Business Media New York.


Gaivoronskii I.V.,Zaporozhe National University | Girzhon V.V.,Zaporozhe National University
Metal Science and Heat Treatment | Year: 2015

X-ray phase analysis and light metallography are used to study pure zirconium surface layer structure after pulsed laser treatment. Afivefold increase in microhardness is established within surface layers of the laser action zone as a result of a high degree of structure dispersion and presence of a significant amount of martensitic phase. © 2015, Springer Science+Business Media New York.


Mishchenko V.G.,Zaporozhe National University | Sheyko S.P.,Zaporozhe National University
Steel in Translation | Year: 2014

The influence of the rolling parameters on the structural and phase transformations and mechanical properties of steel is analyzed. At a particular combination of temperature, strain, and strain rate, fine-grain austenite structure may be obtained, with highly developed polygonal substructure. For low-carbon steel, the best combination of cooling and winding parameters after rolling is as follows: tfr = 800–850°C; tin.co = 750°C; vco = 80°C/s; twi = 500°C. © 2014, Allerton Press, Inc.


Psarev V.I.,Zaporozhe National University
Russian Journal of Non-Ferrous Metals | Year: 2010

The features of the formation of a system of microinclusions during the decomposition of supersaturated solid solutions are analytically described taking into account the size factor of interfacial surface energy. The suggested computation discloses the physical meaning of phenomena corresponding to phase transformation during the homogeneous and heterogeneous modes by which it proceeds. The supersaturation of the matrix phase is the determining characteristic of such a possibility at the stage of nanostructured nucleation. Unimodal and bimodal systems of microparticles can form at definite values of this quantity. Reliably established experimental facts confirm the conclusions of this theoretical analysis. The obtained solutions can be spread to the various bulk and surface systems of dispersed particles. © 2010 Allerton Press, Inc.


Butrimov P.A.,Zaporozhe National University | Anan'ina O.Y.,Zaporozhe National University | Yanovskii A.S.,Zaporozhe National University
Journal of Surface Investigation | Year: 2010

The dependence of the binding energy and the activation energy of adsorption of hydrogen atoms on the number of previously adsorbed particles and their position-on one or both sides of a cluster, on nearest or distant neighbors (carbon atoms)-is investigated by quantum-chemical modeling. A hypothesis of the formation of adsorption sites (islands) on graphene at the initial stage of its saturation by hydrogen is discussed. © 2010 Pleiades Publishing, Ltd.

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