SUPERHIGH-ENERGY ELECTROIMPULSES IN THE METAL’S MELT

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Guidance of solidification’s processes of fluid metals has enormous value for the most various branches of the modern materiology, in particular special electrometallurgy and welding by a fusion. Academician D.I.Korneev of effect of superhigh-energy electrocurrent pulsing processing /SHEEP/ of melts solved the problem of adequate methods search of action on metals in basic after his discovery. Phenomenon SHEEP allows to carry out unique experiments on re-structuring a matrix basis a solid phase. Thus, basic principles of the theory of the condensed state of substance, the bound with oscillation, metastability, and evolution specific consistence are mentioned. Comparison of effects of the metallographic analysis shows, that, following strictly classical interpretation of processes of a crystallization and evolution in time modular states, it is not possible to receive qualitatively correct analogy to apparent physical processes.

Represented operation prolongs build-up of phenomenological model of phenomenon SHEEP based on interdisciplinary examinations of various aspects of complex action of destabilizing factors /CADF/. One of essential factors of regulation of processes of solidification fluid metals is their interior diffusion. The natural convection of a melt is determined by lapse rates of a temperature’s field. It is artificial labialized transport of a fluid consistence with inserts microcrystals depends on pulsing intensity of an exterior electromagnetic field and magnetohydrodynamic effects of collapse a trunk of the channel of the electrodischarge /CED/.

Parameters of thermo-streams of a melt are defined so-called Rayleigh numbers describing the relation of driving force to viscosity’s parameters of melt:

N(r) = g b(l) x(l) c l(m)^3 gradT / [K*(T) y(l)^2], (1)

where g – acceleration of gravities; b(l) - volumetric thermal expansion coefficient of a melt; x(l) and y(l) - dynamic and kinematical viscosity; c - heat capacity; l(m) - characteristic distance of convective mass transport; K*(T) - thermal conductivity. Magnetic making electromagnetic impulses SHEEP essentially veers a resulting convection of a conducting medium of a melt. Such motion through power lines of a magnetic field causes occurrence of force of the inductive inhibiting action, which in some approach can be viewed as a magnetic creep. The role of a magnetic creep is defined by value:

M* ~ H l(m) [x(l) e*]^0, (2)

where H - a magnetic intensity; e* - a direct-current conductivity of a melt.

At observation of CADF SHEEP, among views convectional masstransport electromagnetic and magnetohydrodynamic components dominate. Thus, streams of thermal energy are featured by the equation:

dT / dt = K*(T) Ñ ^2T – v(p) dT / dq, (3)

where v(p) - growth rate of a phase of a solidus; q - the generalized spatial coordinate.

Character convective masstransport in a melt of metal renders direct action on effects formation of a solid phase. Therefore, the laminar flow gives in growth of microcrystal grains in a direction opposite to an incident flow. On the other hand convective turbulent vortexes destruction the advanced branches of micromonocrystals, also are incremented with probability of their subfiltration in capillaries associations.

The generalized crystallographic pattern of a structure hardened without CADF guesses presence of three zone fractions: the compact-grained surface, columnar and plate-equilibrium. We shall improve that for carbonaceous and low-alloy steels presence of all three set forth above fractions is observed, and in structure of stainless steels prevail columnar fraction without a central equilibrium band with inappreciable peripheral fineness. CADF SHEEP completely changes structure of metal, translating it in a matrix with the expressed medial order of finely divide’s translation meshes.

At the analysis of a level of verification of viewed model SHEEP mechanisms, it is necessary to carry out their maximization on a statistical weight at consecutive input of various characteristic parameters. Among such parameters it is necessary to allocate lapse rates of concentration of nonequilibrium plasma along tubes of a current in trunk CED, balance of the relative concentrations of various charge carriers and their velocities of oscillation, a recombination and an annihilation. At transition to model operation of inhomogeneities quasineutral CED plasmas, it is necessary to structure qualitative dependences of local concentrations of charge carriers and electromagnetic fields lengthways various directions of power lines of peak-a-boo fields of pulsing electrodischarges. Taking into account technological homogeneity of series of SHEEP discharges it is possible to present, that the blanket balance of number of charge carriers of CED trunk will be featured by the equation

d[N(i)] / dt + d[N(e)] / dt + d[N(pl)] / dt + div(q v) = v*, (4)

where N(i), N(e) and N(pl) - average on volume of CED trunk of concentration of charge carriers; v and v* - medial for SHEEP period of transportation’s velocity and volumetric processes of ionization, the charging inverse and a recombination of charge carriers. Here too it is necessary to carry out particular correction of kinetics of the charging collectivization with processes of the ambipolar masstransport in oscillating electromagnetic field.

Being returned to difficult to explain mechanisms in models of CED evolution, we shall note many insufficiently studied processes of direct ionization by electronic shock and a dissociative electron-ionic recombination. The detailed analysis of a relation (4) allows essentially improving a partial composition of energy balance of empirical model of SHEEP. The electrical power, oozed in unity of melt’s volume will be spent for CED formation with subsequent collapse and oscillation of magnetohydrodynamic effects. Subsequent of thermal dissipation of magneto-hydrodynamic oscillations energy is accompanied magneto-hydrodynamic by the effects labializing metastable quasicyclic reactions in direct and return phase transitions

{I(pl)} + < T(l) > + M(l) <=> {I(pl)}* + < T(s) > + M(s) + M(sl), (5)

where {I(pl)} - stream of plasmoids; < T(l) > and < T(s) > - lapse rates of phase temperatures; M(s), M(s) and M(sl) - modular phases of melt [8].

Inhomogeneities of physical properties of CED trunk change a relation a builder, included in energy balance, varying course of quasichemical reactions (5) in the allocated points of volume hardening metal. The given deduction numerous experimental effects, and mathematical models of confirm evolutions of energy’s balance. Thus, it is possible to draw prestress deductions on a probable course of processes nonequilibrium converting and the subsequent dissipative relaxation of electromagnetic energy of electrodischarges. The given phenomena will be defined and in a particular degree to be limited by quasihomeomorphic variations thermodynamic and physical properties of metastable medium hardening metal [10, 11].

The qualitative above described pattern of development of various instabilities plasma of CED trunk at SHEEP includes only basic well identifiable effects. Plans of such processes may be constructed on a hierarchical basis and include a gang of the basic empirical connections between the integrated performances determining summary dynamic balance of radiants and sinks of converted electromagnetic energy [9].

1. Feygin O.O. Action of high-energy electroimpulses on metal melts// Ibid.- http://www.sciteclibrary.ru/eng/catalog/pages/5294.html

2. Korneev D.I., Feygin O.O. Paradoxical physics of super-power impulsing discharges// SciTecLibrary.com.2003. - http://www.sciteclibrary.ru/eng/catalog/pages/5347.html

4. Korneev D.I., Feygin O.O Thermodynamics of fluid metals at ultrahigs energies of electrocurrent action// Ibid. - http://www.sciteclibrary.ru/eng/catalog/pages/5454.html

5. Feygin O.O. Explosion of boiling metal// Ibid. – http://www.sciteclibrary.ru/eng/catalog/pages/5592.html

6. Petrenko S.S., Feygin O.O. Nonequilibrium crystallization of metal melts// Ibid. - http://www.sciteclibrary.ru/eng/catalog/pages/5687.html

7. Korneev D.I., Feygin O.O. Quasicrystallization of metals at ultrahigh energy of action// Ibid. - http://www.sciteclibrary.ru/eng/catalog/pages/6078.html

9. Korneev D.I., Feygin O.O. Theoretical explorations of processes high-energy electrophysical treatments of metal’s melt// Ibid. - http://www.sciteclibrary.ru/rus/eng/catalog/pages/6436.html

10. Korneev D.I., Feygin O.O. Mechanisms of the operation of electroimpulses channels in the metal’s melts// http://www.sciteclibrary.ru/rus/eng/catalog/pages/6586.html

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