Diffusion of boron in FeB and Fe2B layers under solid boriding of steel AISI D2 (the Russian counterpart is Kh12MF) is simulated. Two approaches are used to assess the diffusion coefficients in solid-phase boriding, i.e., the concept of the mean value of diffusion coefficient in the FeB – Fe2B system and consideration of the growth kinetics of each of the two boride layers with the use of a system

Vanadium carbide coatings deposited on steel AISI 52100 (the Russian counterpart is bearing steel ShKh15) by the method of thermo-reactive diffusion (TRD) in a sealed container at 900°C for 2 – 8 h are studied. The structure of the coatings is analyzed by scanning electron microscopy and x-ray diffractometry. The microhardness is measured. Adhesion tests are performed by the Daimler-Benz Rockwell-C

Friction treatment (FT) with a sliding indenter forming nano- and submicrocrystalline austenite structures in the surface layer of austenitic steel 03Kh1N14M3T (the volume fraction of strain martensite does not exceed 1.5%) is studied. It is shown that the FT hardens the surface of the steel to 720 HV0.025 and raises the wear resistance under the conditions of sliding friction with a lubricant by a

The structure and the hardness of hybrid metal matrix composites with a matrix from alloy 6063 of the Al – Mg – Si system and dispersoid particles of Al2O3 and SiC are studied. At less than 5 wt.% dispersoid in the composition the distribution of particles in the matrix is uniform; at a higher content of dispersoid the particles are segregated even over grain boundaries of the matrix. The density and

The effect of the relative fraction of powder of steel 4605 (0.42% C, 2.15% Ni, 0.49% Mo, 0.1% Si) mixed with a polymer binder in injection molding of billets (the MIM technology) on their tensile mechanical properties, hardness, density and toughness is studied. The polymer binder is based on high-pressure polyethylene (HDPE), paraffin wax (PW) and stearic acid (SA). It is shown that the mechanical

The possibility of fabrication of permanent magnets based on a Fe – Cr – Co alloy with reduced cobalt content by the MIM technology is considered. The method is used to obtain permanent magnets 3 × 2 × 6 mm in size with magnetic properties close to those of standard 25Kh15KA magnets produced by investment casting. The microstructure and the magnetic properties of the alloys are studied.

The methods of optical and scanning electron microscopy and x-ray spectrum microanalysis are used to study and to compare the special features of formation of metastable trialuminides under rapid crystallization of superheated melts of the Al – Hf – Sc and Al – Hf – Ti systems. Heating of such melts by over 100°C above the liquidus temperature yields Aln(Hf1–xScx) and Aln(Hf1–x Tix) aluminides with

X-ray diffractometry and mathematical processing of diffraction patterns by the A. N. Tikhonov regularization method, which enhances the resolution, are used to study the kinetics of formation of phases in the forward reaction of the HDDR process in its early stages (the first minutes) in alloys based on Nd – Fe – Co – B – Zr.

The effect of nickel content in a high-strength medium-carbon complexly alloyed steel on the structural and phase transformations, location of critical points, quantitative parameters of microstructure and critical quenching rate is studied. Thermokinetic diagrams of decomposition of supercooled austenite in the steel with original composition are plotted and the characteristic types of microstructure

The structure and mechanical properties of different-thickness copper foils obtained by chemical and electrochemical deposition at high and low temperatures are studied. The activation energy and the driving force of the recrystallization are determined.

Results of a study of the low-cycle fatigue of singe crystals with orientations 〈001〉 and 〈111〉 from rhenium-containing refractory nickel alloy ZhS32 and of specimens of alloy ZhS32 obtained by selective laser melting on a single-crystal substrate from alloy ZhS32 at “soft” loading cycles (the controlled parameter is the strength amplitude in a cycle) at 750°C and “rigid” loading cycles (the controlled

Abrief review of reported data on special features of formation of structure in surface layers of metallic materials under contact deformation in active lubricants is presented. The factors affecting the kinetics of the process of formation of a wear resistant structure are considered.

The behavior of the structure of abrasion-resistant alloys of the Fe – Cr – C – Mo – Ni – Ti – B system during electric arc cladding with introduction of ultrafine particles of titanium nitride into the welding pool in the composition of both the electrode and the filling powder wires is considered. The effect of titanium nitride on the hardness and wear resistance of the experimental clad alloys at

The effect of nickel additions on the microstructure and ultimate tensile strength of alloy Al – 10% Si – 5% Cu in cast and heat treated conditions is studied. The nickel content optimum for obtaining a maximum-strength alloy is determined. The conditions at which a fishbone morphology negatively affecting the mechanical properties does not form are determined. Mechanical stirring of the melt before

The temperatures of appearance and degradation of short-range and long-range ordering in VDM® Alloy C-4 (UNS 2.4610/N06455) are determined with the help of physical methods of research. The sensitivity of the methods to these effects is studied. The results obtained are used to make recommendations on determination of the temperatures of disordering-ordering and ordering-disordering transitions in

The problem of formation of properties in microalloyed sheet steels is considered. The cause and the possible mechanism of precipitation of carbides of refractory metals on the boundary of the γ → α phase transition are suggested. A possible model of formation of a Fe3 C nucleus from austenite is presented.

The nitride layer obtained by low-temperature plasma nitriding on the surface of steel H13 used to produce hot-forming tools is studied. The structure of the surface layers is investigated by scanning electron microscopy, atomic force microscopy, x-ray diffractometry, and x-ray photoelectron spectroscopy. The roughness of the surface and the strength of bonding of the coating are determined. The nitrided

Wires with diameter 0.25 mm from a carbon steel with 0.70 and 0.90% C for tire cords are studied. The effect of the treatment modes, of the carbon content and of the morphology of pearlite on the fatigue resistance of the wires under pure bending tests at a frequency of 10 Hz is determined. The fracture mechanism of the wires is considered. The influence of the microstructure and of the composition

The effect of the content of chromium and vanadium on the corrosion resistance of steels in CO2-containing media is studied. Changes in the structure and composition of products of carbon dioxide corrosion are determined as a function of the concentration of chromium and vanadium. Special features of formation and structure of products of carbon dioxide corrosion are determined in tests in static and

The relation between the microstructure and the corrosion behavior of Hastelloy® G-35® in a KCl – AlCl3 salt solution after different deformation and heat treatments (DHT) is studied. It is shown that DHT may be used for creating a structure providing a corrosion rate lower than that of the traditional single-phase structure formed in the alloy by quenching.

The effect of an electrolytic-plasma treatment on the structure of steel 45G is studied. The possibilities of computer technologies for description of steel structures are considered.