This article studies the static strength, static fracture and stiffness of the teeth of a wheel made of structural alloy steel of 12KhN3А grade before and after the carburizing of the working surface. The results of the analysis show that the static strength and static destruction of the part before and after chemical heat treatment are approximately equal, however, the gear wheel, strengthened by this method, has a higher hardness. The study and simulation of the applied loads were carried out using a 3D-model in the SolidWorks 2018 Simulation software.

The paper presents the results of studies of the structure and physical and mechanical properties of copper M0b after combined plastic deformation under different schemes of equal channel angular pressing (ECAP) and upsetting or ECAP and multi upsetting. Comparative characteristics of the structure, hardness and deformational decompaction of copper are given. Interesting to note that after ECAP and multi upsetting treatment, a deeper development of the structure has been observed.

The purpose of this work is to show that during mixing, two hidden (latent) processes proceed simultaneously and compensate each other: the first initiates an increase in the average heat capacity, equal in magnitude to the entropy of mixing, which requires energy absorption to ensure a constant temperature, the second initiates simultaneous latent heat release by strengthening interatomic bonds. The passage of these two processes during mixing shows the identity of the vibrational and configurational (statistical) entropy.

The article presents experimental data on the effect of microarc oxidation parameters on the thickness and structure of the MAO-coating and its tribological characteristics in friction against bronze. The appli- cation of thick antifriction coatings by the MAO-method on titanium alloys has been developed. The possibility of using MAO-coatings of high thickness in sliding friction units was investigated.

The paper studies a method for producing nanostructured composite powders of the metal – non-metal system. Powders preparation by universal disintegrator-activator technology, processing in planetary ball mills and bowl grinders is shown on the Al–Zn–Sn composition and titanium nitride nanoparticles. Judging by engineering-and-economical performance, the most promising method for obtaining nanostructured composite powders is the method of processing in a bowl grinder.

This paper presents the results of comprehensive studies of the process of obtaining volume-porous catalytically active coatings based on г-Al₂O₃ using a controlled microplasma spraying process.

The paper presents the results of laboratory and bench tests of UGET and FUT antifriction carbon plastics macro modified with PTFE. The efficiency (friction coefficient reduction) of this modification of carbon fiber reinforced plastics has been confirmed. The dependence of the method’s efficiency on the design of sliding friction units has been established. The plastic deformation of the fluoroplastic is the key factor that determines the effectiveness of the modifier when designing sliding bearings. The design of the friction unit should exclude the pressure gradient in the fluoroplastic protectors and prevent the possibility of an uncontrolled exit of the fluoroplastic from the friction zone.

This article presents the results of studies of the properties of fiberglass based on polyetheretherke- tone (PEEK). A comparative analysis of the physical, thermophysical, elastic-strength and dielectric properties of fiberglass based on PEEK and fiberglass based on epoxy binder is carried out. The results of a study of the fire-insulating properties of fiberglass based on PEEK are presented.

Compounds based on PVC-plasticate of I40-13A grade, zinc borate, antimony and chalk oxide have been obtained. The thermal stability, thermophysical and operational properties of the obtained compounds have been investigated. It was found that the modernized compounds have high thermal stability values that meet the requirements for insulating materials. It is shown that the obtained compounds have low values of heat release, heat of combustion, smoke formation and release of hydrogen chloride. It was found that the operational characteristics of the modernized PVC cable compounds are improved.

This article presents the results of studies of corrosion-resistant surfacing with a strip electrode under a layer of flux on carbon steel, performed by arc and electroslag methods. The similarity of the chemical composition, structure, mechanical and corrosion characteristics of the deposited metal in both cases is estab- lished. It has been shown that electroslag surfacing provides greater purity for non-metallic inclusions.

This article investigates the change in the structure of heat-resistant nickel alloys doped with cobalt, chromium, molybdenum, aluminum, niobium, tungsten and titanium and aluminum, cobalt, rhenium, tantalum, ruthenium, molybdenum, tungsten and chromium under the influence of a solution of 75% Na₂SO₄ + 25% NaCl in temperature range 600–750°C. As the results of the study show, a corrosive film of a layer struc- ture based on oxides of chromium, aluminum, nickel and nickel sulfides is formed on the metal surface. It has been established that the nature of corrosion destruction of metal depends on the composition and content of alloying elements in it.

Experimental data are obtained for austenitic chromium-nickel steel of 18Cr–10Ni–Ti grade(analog of AISI 321 steel) irradiated with mixed neutron spectrum to various damage doses at temperature near 300oC. Metal for investigations has been taken from decommissioned components of internals of WWER type reactor. On the basis of the tests of standard cylindrical specimens the strengthand the plasticity characteristics are determined over wide temperature range. The fracture mechanisms are studied by SEM examination.

It is revealed that the fracture strain decreases with decrease of temperature and the transition occurs from transgranular ductile to intergranular brittle fracture. The performed review of other published works has shown that this phenomenonmay be observed for various austenitic steels irradiated with mixed neutron spectrum and for austenitic and ferritic steels with implanted helium. This phenomenon is termed as low temperature helium embrittlement (LTHE).

The effect of neutron irradiation on the mechanical properties, fracture toughness and hardness of martensitic-ferritic stainless steel 14Kh17N2 grade (analogue of AISI 431 steel) is investigated. The investiga- tion is carried on the metal of control rods couplings of WWER-440 reactor of Unit 3 of Novovoronezh NPP. The metal had neutron fluence up to 8·1020 neutr./cm². The dependence of yield stress of the steel 14Kh17N2 grade on temperature and neutron dose is defined and correlations between its yield stress, fracture toughness and hardness are evaluated.

The structural integrity of the control rods couplings of the WWER-440 reactor is analyzed. On the basis of material investigation of the control rod couplings (martensitic-ferritic stainless steel grade 14Kh17N2, analogue of AISI 431 steel) that were under operation in the Unit 3 of Novovoronezh NPP it is shown that the structural integrity of the coupling is satisfied until the radiation-induced hardening of its material does not exceed 423 units of Vickers hardness.

The optimization of post-irradiation recovery annealing of metal of control rods couplings (marten- sitic-ferritic stainless steel 14Kh17N2 grade, analogue of AISI 431 steel) is carried out. It is shown that the optimized recovery annealing leads to complete recovery of the mechanical properties of coupling metal embrittled under neutron irradiation. The recovery annealing does not reduce corrosion resistance of control rod tube made of austenitic stainless steel 08Kh18N10T grade (analogue of AISI 321 steel).