Papers by Keyword: Pulsed Electron Beam

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Authors: Viktor N. Kudiiarov, Natalia S. Pushilina, S.Y. Harchenko
Abstract: Experimental Stand for Testing Electrochemical Permeation (STEP) of hydrogen through metal foils was constructed and described in this paper. Hydrogen diffusion coefficients in different metal foils at room temperature can be determined by using STEP. Influence of pulsed electron beam irradiation on hydrogen diffusion coefficient in zirconium alloy E110 was investigated. It was established that treatment by pulsed electron beam with the energy density of 18 J/cm2, by three impulses with duration 50 μs leads to a decrease in the diffusion coefficient of hydrogen on the order of one. This is due to the fact that structure with more branched crystals’ boundary formed after irradiation and such structure is effective trap for hydrogen. Also there is formation of protective oxide film after irradiation.
224
Authors: Alexander Tabaev, Galina Kholodnaya, Roman Sazonov, Denis Ponomarev
Abstract: This paper presents results of study of dissipation processes of pulsed electron beam in the oxygen and hydrogen (300 Torr). These gases are chosen owing of their use as a operating environment at pulse plasmochemical synthesis of nanosized oxides of metals. Experimental studies are conducted on the laboratory TEU-500 electron accelerator (500 keV electron energy; 10 кА ejected electron current; 60 ns half-amplitude pulse duration; 5 pps pulse repetition rate; diameter of a bunch is 5 cm). The electron beam was removed in a drift pipe through the anode window which is the supporting lattice (with optical transparency of 95%) and through aluminum foil 140 microns thick. The pipe of drift is equipped with three shunts of the return current which are fixing a signal at the same time. The received results of researches allow to make a conclusion. It is necessary to increase length to 80 cm and diameter to 30 cm of a pipe of drift for optimum absorption of a pulse electron beam by operating gas, for obtaining high efficiency of electron accelerator of pulse plasmochemical synthesis of nanosized oxides of silicon and the titan.
653
Authors: N.S. Pushilina, Ekaterina N. Stepanova, E.V. Berezneeva, A.M. Lider, Ivan P. Chernov, S.V. Ivanova
Abstract: The paper presents the results of the pulsed beam effect on the structure and phase composition of zirconium alloy. Such treatment is demonstrated to lead to forming of complex morphology martensite in the surface layer of the alloy. The processes of hydrogen absorption by zirconium alloy with modified surface have been studied. Modification of the samples is found to reduce the amount of hydrogen, absorbed by the volume of zirconium alloy during hydrogenation.
66
Authors: Yurii F. Ivanov, Elizaveta A. Petrikova, Anton D. Teresov, Pavel Moskvin
Abstract: Combined treatment including vacuum arc deposition a hard nanocrystalline TiCuN coating followed by electron-beam treatment has been carried out in the present work. The structure and phase composition of surface layer have been studied by scanning and diffraction transmission electron microscopy. The modes of treatment leading to a dramatic improvement of microhardness and wear-resistance of modified material have been determined. It has been established that the combined treatment results in microscopic delamination of the silumin by elements and an interlayer of thickness ~20 nm dominated by silicon atoms is formed along the coating substrate interface.
157
Authors: Thierry Grosdidier, Y. Samih, Nathalie Allain-Bonasso, Bernard Bolle, Z.X. Zou, Y. Quin, Sheng Zhi Hao, Chuang Dong
Abstract: The low energy high current pulse electron beam (LEHCPEB) irradiation induces ultra fast dynamic temperature fields in the surface of the material to which is associated dynamic stress fields that causes intense deformation at the material surface and sub-surface. Improved surface properties (hardness, corrosion resistance) can be obtained using the LEHCPEB treatment. Under the “Melting” mode, the top surface (few µm) which is melted and rapidly solidified (107 K/s), can solidify has nano-domains formed from the highly under-cooled melt. The thermal stress wave that propagates in the sub-surface imposes strain hardening and grain size refinement. This induces a sub-surface hardening that can extent over about 100 µm. The use of the “Heating” mode is less conventional. This mode can promote grain size refinement, hardening as well as texture modification without modification of the sample geometry.
499
Authors: Nurken E. Aktaev, Alexander Y. Pak
Abstract: The theoretical model for investigation of the electron beam propagation in the gas medium is developed. The main feature of the model is the possible to analyze the time evolution of the differential current which allows obtaining the energy distribution function of electron. The equations for electromagnetic fields created by the electron beam are the time dependence function. The elastic collision and ionization are considered as a basic interaction processes between beam and gas medium.
37
Authors: Thierry Grosdidier, Bernard Bolle, J.D. Puerta Velásquez, J.X. Zou, Jean-Jacques Fundenberger, Nathalie Allain-Bonasso, P. Chevrier, Albert Tidu
Abstract: This paper reviews some recent results concerning surface integrity of materials processed with two important developing techniques: high speed machining (HSM) – here applied to the difficult case of Ti alloys – and low energy high current pulsed electron beam (LEHCPEB) surface treatment of steels. The effect of the processing parameters on the development of microstructure, texture and residual stresses is detailed for modifications occurring both at the surfaces and sub-surfaces.
9
Authors: Yurii F. Ivanov, Natalja Popova, Mark Kalashnikov, Victor Gromov, Evgeniy Budovskih, Anton D. Teresov, Elena L. Nikonenko
Abstract: Modification of a titanium surface layer with yttrium using the combined technique of electroexplosive doping and the subsequent irradiation by a high-intensity electron beam is carried out. The studies on the structure, the element and the phase composition, mechanical and tribological properties of the doped layer are carried out. Formation of a multiphase submicron-nanocrystalline eutectic is revealed. A multifold increase in the microhardness, a decrease in the friction coefficient and the wear rate of the modified layer is established.
63
Authors: Artem V. Poloskov, Ivan S. Egorov, Vitaly Ezhov, Gennadiy Remnev
Abstract: Paper presents the results of experiments on multicapillary carbon-epoxy as a candidate material for a cathode of a pulsed electron accelerator. A high voltage pulse of 350 kV, 350 ns (FWHM) was applied to the cathode. The pulse repetition rate was 20 pps. The optical image of the cathode surface after 4×104 shots of electron beam was changed as well as electrical characteristics of the electron diode.
667
Authors: Yurii F. Ivanov, Olga V. Krysina, Elizaveta A. Petrikova, Оlgа V. Ivanova, Irina Ikonnikova, Maria E. Rygina
Abstract: The temperature fields arising in a Ti film – Al substrate system and bulk Ti specimen irradiated with a submillisecond intense electron beam are calculated in the one-dimension approximation. It is found that the temperature fields in the irradiated bulk Ti specimen and Ti film – Al substrate system differ greatly. Electron beam irradiation conditions which allow solid-phase and liquid-phase alloying of aluminum with titanium are defined
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