The regime parameters providing the improvements of initial cast structure in a white alloy quasi-eutectic pig iron are specified for the applied heat treatment which is based on the early defined principles of microstructure «regeneration» in hetero-phase materials with polymorphic matrixes. Extremely undesirable, typical original microstructure of the iron comprising big, plate-like, «ledeburite» cementite crystals along with coarse-grained colonies of pearlite-like structures was observed. Formation of dispersed, homogeneous in size and spacial distribution sole alloy cementite crystals instead of the «ledeburite» one, within fine grained matrix containing nano-sized cementite particles is shown as a result of the optimal «regenerative» heat treatment employment. Conserving the original iron hardness on the level 60-63 HRC was observed that confirms stability of its phase composition despite the obtained structure`s morphology changes. Unified features of the structure «regeneration» processes in hetero-phase metallic materials of various chemical composition are outlined that provides reliable obtaining high mechanical performance of the materials

Electrochemical study of polybrominated 2-dibromomethyl-2-methylcyclohexan-1-one, 6-dibromomethyl-6-methylcyclohexa-2-en-1-one, 6-dibromomethyl-6-methylcyclohexa-2,4-dien-1-one, and some of their 6-dichloromethyl analogs has been performed using cyclic voltammetry and rotating disc electrode methods.

Изучено влияние изотермических выдержек при нагреве на морфологию графитовой фазы (ГФ) в промышленных серых и высокопрочных чугунах. Выявлено два варианта такого влияния: 1) частичное растворение пластин ГФ с образованием «разорванных»: тонких пластин, содержащих отдельные крупные сферические частицы ГФ; «сетки» тонких прослоек ГФ на границах зерен феррита; 2) прирост: общей толщины существующих пластин ГФ или размеров исходных сферических частиц ГФ на отдельных локальных участках их поверхностей. Установлено значительное повышение ударной вязкости всех изученных чугунов

Spectral, luminescent and time-resolved characteristics of 2,5-dibenzylidenecyclopentanone and its symmetrical derivatives (bis( N,N -diethylamino-), dimethoxy-, tetramethoxy-, dimethylthio-, and bis-18- crown-6 derivative) have been studied in media of different polarity (cyclohexane, toluene, acetonitrile, DMSO, and methanol) at room temperature. The absorption maximum of dibenzylidenecyclopentanone shifts bathochromically by 15 nm with an increase in polarity of the medium (cyclohexane–methanol). The introduction of electron-donating substituents in the aromatic rings of dibenzylidenecyclopentanone also results in a bathochromic shift of the absorption maximum by 100–130 nm in the media of different polarity and shifts the fluorescence maximum by 130 nm relative to the maximum of the dimethoxy derivative. Upon laser irradiation of oxygen-free solutions of dibenzylidenecyclopentanone and its tetramethoxy- and bis-18-crown-6 derivatives in acetonitrile, the triplet state with a half-life time of 0.3–1 μs is generated. For dimethoxy-, dimethylthio-, tetramethoxy-, and bis-18-crown-6 derivatives of dibenzylidenecyclopentanone, the isomers with a lifetime of ~50 ms are formed.

The bromination of (E)-4,4-dimethyl-6-isobutylidenecyclohex-2-en-1-one with molecular bromine occurs first at endocyclic double bond and next at the exocyclic one.

A series of cross-conjugated dienones was synthesized to study the dependence of physicochemical characteristics on the nature of substituents in the aromatic groups of symmetric cyclopentanone dibenzylidene derivatives. The structure of compounds was established by electronic, IR, and NMR spectroscopy and X-ray diffraction study. All the compounds obtained possess the E,E-geometry. In the crystalline state, the arrangement of the dienone molecules is unfavorable for the intermolecular [2+2] photocycloaddition to take place. The low-temperature phases transition for unsubstituted diphenyl derivative of cyclopentanone was detected using variable-temperature X-ray diffraction and differential scanning calorimetry. Oxidation and reduction potentials of the dienones were measured by cyclic voltammetry. Their dependence on the nature and placement of substituents in the benzene rings was demonstrated. A linear correlation (R = 0.9343) between the difference of electrochemical oxidation and reduction potentials and the energy of the long-wavelength absorption maximum was found, that allows us to recommend the use of the data obtained in the correlation analysis of other compounds of this class.

The properties of 4-methyl-4-(trichloromethyl)cyclohexa-2,5-dien-1-one which contains the trichloromethyl substituent at a quaternary carbon atom have been studied by cyclic voltammetry, rotating disk electrode voltammetry, and preparative electrolysis. Reductive dehalogenation involves initial two-electron reductive elimination of one of the geminal chlorine atoms followed by consecutive addition of proton, simultaneous elimination of the two residual halogen atoms to form carbene, and rearrangement of cyclohexadienone into the corresponding 4-methylcyclohepta-2,4,6-trien-1-one.

Bromination of 6-dibromomethyl-6-methylcyclohexyl-2,4-dien-1-one (I) with molecular bromine was studied at different ratios of reactants and varied reaction time. A number of tri-, tetra-, penta-, and hexabromo derivatives was obtained, which were characterized by 1H, 13C, IR, UV spectroscopy and elemental analysis. The molecular structure of (2R,3R,4S,5S,6R)-2-dibromomethyl-2-methyl-3,4,5,6-tetrabromocyclohexan-1-one (V) was revealed using XRD. It was shown that 2-bromo-6-dibromomethyl-6-methylcyclohexyl-2,4-dien-1-one (III) upon standing for six months at room temperature dimerized quantitatively via Diels-Alder reaction to form IX. Dimer IX was investigated by the methods of cyclic voltammetry (CVA) and rotating disk electrode (RDE) in a solution of DMF on glassy carbon electrode.

It is found that during oxidizing heating at 1000-1150 оС the secondary and eutectic carbides dissolution accompanied by carbon content decreasing and chromium content increasing in surface layers of high-chromium cast iron takes place. The processes kinetics is studied, kinetic parameters are found, activation energy and diffusion coefficient of carbon are calculated

The structures of 1,7-dimethyl-1,7-bis(dichloromethyl)-5,8-ethenodecalin-3-ene-2,6-dione, the dimer of 6-methyl-6-dichloromethyl-cyclohexa-2,4-dien-1-one, and of products of its bromination were established by XRD analysis. The dependence of composition of the products of bromination on the ratio of reactants was established. Electrochemical reduction of the dione and its bromine-containing derivatives was studied.

Григорьева М. А. Влияние упрочняющих факторов на прочность конструкционной стали / М. А. Григорьева, В. А. Русецкий, В. Г. Гаврилова // Інноваційні ресурсозбережні матеріали та зміцнювальні технології: матеріали Міжнар. наук.-практ. конф. 6-8 червня 2012, м. Маріуполь / ДВНЗ «ПДТУ». – Маріуполь, 2012. – С. 130-131.

A thermo-dynamical analysis of the state of iron-arsenic system at various temperature conditions was carried out in the article .Dependence of partial pressure of arsenic and phosphorous vapours and the activity of the described elements upon their mole shares inside melts based upon iron was experimentally evaluated.

Особенности деформационного упрочнения в процессе растяжения стали Х70, закаленной из межкритического интервала / Ф. К. Ткаченко [и др.] // Вісник Приазовського державного технічного університету : зб. наукових праць / ПДТУ. – Маріуполь, 2011. – Вип. 22. – С. 128–131. – (Серія : Технічні науки).

Electrochemical investigation of 4(6)-dihalomethyl-4(6)-methylcyclohexa-2,5(2,4)-dien-1-ones using cyclic voltammetry (CVA) and rotating disc electrode (RDE) methods has been performed. The reductive dehalogenation of cyclohexa-2,5(2,4)-dien-1-ones having a dihalomethyl substituent at the tertiary carbon atom was shown to proceed as a two-electron reductive elimination of the geminal halogen atoms with the intermediate formation of carbene and subsequent rearrangement of cyclohexadienone with the ring expansion to the corresponding 4- or 2-methylcyclohepta-2,4,6-trien-1-one.