CONTENTS

 

Effect of energy fluxes on materials

 

B.A. Kalin, N.V. Volkov, R.A. Valikov, A.S. Yashin

Effect of ion polishing on corrosion resistance of fuel claddings

from zirconium alloy E110 in steam-water environment .............................................................................................................. 5

The method of modification of the outer surface of the fuel cladding from E110 Zr alloy by means of irradiation

with a radial beam of Ar+ ions with a broad energy spectrum is proposed. It is shown that the use of ion-beam

treatment at the final stage of the cladding production can improve the surface quality due to removing a large

part of the mechanical polishing induced surface defects. Kinetics of the oxide films growth on ion-beam treated

(cleaning or polishing by Ar+ ions) tubular Zr alloy specimens in a steam environment (350, 375, and 400, up

to 3000 h) has been investigated. Monoclinic zirconia layer formation is found to be occurred on the specimen

surface oxidized at 350C in water and steam environments. Oxidation of the fragments of Zr alloy fuel claddings

in a steam under the pressure promotes the formation of a more thick and friable oxide film in comparison with

the oxidation in a water.

Keywords: zirconium alloys, fuel cladding, surface modification, ion cleaning, ion polishing, ion alloying.

 

N.V. Glushkova, V.A. Tsygvintsev, A.V. Kozlov, V.L. Panchenko

Changes in the characteristics of the fine structure of ChS-68 steel under neutron irradiation ................................................. 12

Based on the results of X-ray diffraction and electron microscopy studies of ChS-68 austenite steel after neutron

irradiation at 370C with dose up to ~2 dpa, the statistical analysis of experimental data has been carried out.

A linear model was proposed for dependencies of the crystal lattice parameter of γ-Fe solid solution on the

elemental composition and radiation dose. In the framework of the model, contributions of the elemental

composition variation and damaging radiation dose accumulation in the solid solution lattice parameter

changes were estimated.

Keywords: austenite steel, lattice parameter, swelling, solid solution, fuel cladding material, statistical treatment.

 

G.. Ozur, D.I. Proskurovsky, V.P. Rotshtein

Microcraters formation on the surface of stainless steels 304L and 316L under irradiation

with low-energy high-current electron beam .............................................................................................................................. 21

Dependencies of the parameters of microcraters formed on the surface of 304L and 316L stainless steels at a

single-pulse irradiation with microsecond low-energy (10-40 keV) high-current electron beam on the beam energy

density have been determined. The mechanism of microcraters formation is proposed taking into account the

radial spreading of the melt from the site of MnS inclusion under the action of gradient of the surface tension

forces induced by inclusion overheating. Estimations of the microcraters size are agreed satisfactory with

experimental data. Effect of the direction of rolling relatively to the irradiated surface on microcrater

characteristics is ascertained.

Keywords: low-energy high-current electron beam, stainless steels, microcraters, mechanism of microcraters

formation, thermocapillary mass transfer.

 

 

Plasmochemical methods of production and treatment of materials

 

S.V. Anakhov, N.B. Pugacheva, Yu.A. Pykin, A.V. Matushkin, T.M. Bykova

Qualitative cutting of steel with the use of narrow jet plasma technology ................................................................................... 31

By metallography and optical interferometry methods, the structure of steel cutting seams fabricated with the

use of narrow jet plasma technology has been analyzed. High quality of the seems done by a narrow jet

plasmatron allow to use of it for welding without removal of heat-affected zone. Application of a new narrow

jet plasma cutting technology secures the getting the high quality welding seams, high efficiency of the process

and a low energy consumption.

Keywords: plasmatron, plasma cutting of steel, cutting quality, heat-affected zone, structure transformation.

 

A.A. Nikolaev, D.E. Kirpichev, A.V. Samokhin, A.V. Nikolaev

Thermo-chemical plasma-arc treatment of leucoxene concentrate ............................................................................................. 38

The ability of separation of titanium and silicon oxides under plasma arc reduction melting of the leucoxene

concentrate of the Yaregs deposit is investigated. The results of thermodynamic calculations of optimal

conditions of the process as well as the experimental data about the product composition and the process

power inputs are presented.

Keywords: plasma, arc, reduction, melt, leucoxene, powder, rutile, silicon.

 

 

Functional coatings and surface treatment

 

A.I. Komarov

Structure formation and properties of ceramic coatings formed under microarc oxidation of Al-6Mg alloy

in electrolyte with TiC nanoparticles ........................................................................................................................................... 45

It is proposed to carry out the process of micro-arc oxidation of aluminum alloys in the electrolyte with

nanoscale additives containing titanium carbide and alumina. The composite coating formed in such

electrolyte-suspension comprises Al2O3 oxide matrix modified with the particles of titanium carbide.

Micro-arc oxidation of Al-6Mg alloy in electrolyte with nanoscale additives can increase the coating

thickness is 2 times (up to 330 μm), and its microhardness in 1.7 times. The resulting coatings have

4.5-12 times lower coefficient of friction and 2 times lower wear rate.

Keywords: microarc oxidation, nanoadditives, titanium carbide, aluminum oxide, modified coating,

tribological properties, microhardness, friction coefficient, wear resistance.

 

O.N. Kanygina, M.M. Filyak, M.V. Ovechkin

X-ray phase and elemental composition analysis of anodic alumina growth in sodium hydroxide solutions ............................. 52

With the help of X-ray diffraction and elemental analysis, the composition and structure of anodic alumina film

produced by anode process in sodium hydroxide based electrolyte have been investigated. The structure of the

crystalline phases constituent of alumina was determined. A high degree of hydration of anodic alumina formed

in sodium hydroxide based electrolyte is ascertained.

Keywords: nanoporous anodic alumina, alkaline electrolyte, X-ray phase analysis, elemental composition.

 

 

Composite materials

 

Yu.G. Skurydin, E.M. Skurydina

Effect of the components of wood composite materials on the temperatures of phase transitions .............................................. 57

By the methods of thermogravimetric and differential thermal analysis, the properties of the pine wood and larch

one in initial conditions and after explosive autohydrolysis treatment have been investigated. Treatment with the

steam under pressure (autohydrolysis) is found do not significant effect on the thermal destruction of the wood

components, but promotes the formation of the polymer bounds under following hot compaction of the

wood-composite plastics.

Keywords: differential thermal analysis, thermogravimetric analysis, wood, explosive autohydrolysis.

 

S.N. Sergeenko, F.T. Dzhuraev, A.Kh. Al Khilfi, A.A. Postnikov

Peculiarities of mechanochemical activation and consolidation

of Al-Si-Ni-Fe-C and Al-Cu-Fe powder charges ......................................................................................................................... 63

Hot formed powder composite materials produced from Al-Si-Ni-Fe-C and Al-Cu-Fe powder mixtures

mechanochemically activated in saturated aqueous solution of boric acid have been investigated.

Granulometric composition of the activated powders was ascertained. Effects of the cold pressing pressure

as well as reduced work of hot forming on the relative density of compacted material were studied. Hot

formed materials produced from the activated Al-Si-Ni-Fe-C and Al-Cu-Fe powder charges are found to

be more hard than those produced by powder mixing technology. Optimal values of the cold pressing

pressure and reduced work of the hot forming are determined which ensure the production of the composite

materials with enhanced relative density and hardness.

Keywords: powder material, mechanochemical activation, consolidation, hot compaction.

 

A.G. Meilakh

Effect of the method of cladding of iron powder with nickel on the properties of sintered materials .......................................... 73

The processes of sintering of sprayed iron powder plated with nickel have been investigated. Dependencies

of the structure parameters and mechanical properties of the sintered materials on temperature of sintering,

powder composition, method of cladding, and conditions of heat treatment of 0,5-2,0% Ni coatings were

ascertained, and mechanisms of the materials compaction are proposed. The use of cladding under combination

of the processes of complete reduction of coatings and the product sintering leads to 2-3% decreasing the

material porosity as well as mechanical properties increasing by 1.4-1.9 times in comparison with the

properties of composites produced from the blends of micropowders.

Keywords: cladding powders, heat treatment, activated sintering, powder materials, structure,

physical and mechanical properties.

 

 

New methods of treatment and production of materials with required properties

 

V.T. Burtsev, S.N. Anuchkin, E.K. Kazenas, V.A. Volchenkova, N.A. Andreeva, T.N. Penkina

The form of the existence of Al in Fe-Sn melts with exogenous nanoparticles of refractory oxides ............................................. 78

Interaction of refractory phase nanoparticles (Al2O3) with a surfactant in Fe-Sn melt results in removal of the

nanoparticle+Sn complexes to the Meceramic or Megas interfaces has been investigated. New methods of

quantitative analysis of Al in Fe-based alloys dissolved in the solution or in the form of alumina were developed

with the use of atomic emission spectrometry with inductively coupled plasma. It is shown that due to adsorption

interaction of Al2O3 particles with Sn, the part of Sn moved off from the melt is 22.5% while the part of removed

Al2O3 nanoparticles in the form of Fe+(Al2O3+Sn) complexes is 65%. Up to 98% of aluminum in the melt is

presented in the form of Al2O3 particles and the only ~2% is in the solution.

Keywords: nanoparticles, luminium oxide, adsorption, iron alloys, autoclave preparation of samples,

atomic emissionspectrometry with inductively coupled plasma.

 

V.N. Roshchupkin, M.M. Lyakhovitsky, M.A. Pokrasin, N.A. Minina

An experimental study of the acoustic properties of heat resistant Ni-Cr-Mo-Al alloy ............................................................... 83

Acoustic properties (velocity and attenuation coefficient of ultrasound) and the relative thermal expansion

of Ni-based heatresistant alloy have been investigated experimentally in the range of 20-1100C. Thermal

expansion data enables to increase the accuracy of acoustic parameters measurement as well as to calculate

the temperature dependencies of the density and modulus of elasticity values. Approximate equations for the

temperature dependencies of the acoustic, thermal, and mechanical properties of the alloy have been determined.

Keywords: alloy, speed of ultrasound, attenuation factor, thermal expansion, density, Youngs modulus.