Using experimental methods of analysis, the morphology, elemental composition and chemical state of hard alloys of the «TiC-TiNi» system in the initial state and after various types of ion-beam treatment have been investigated. It is found that the effect of a continuous ion beam leads to an increase in the microhardness of the investigated alloys by 10–12 %. When samples are irradiated with a pulsed ion beam, as a result of destruction of surface layers, the microhardness value decreases by 20 %, as a result of which this type of modification is not preferable for alloys of the TiC-TiNi system

In the work presents the results of a study of the influence of the effect of a continuous ion beam of the composition (Ar++Zr+) with an ion energy E ≈ 20 keV and an irradiation dose D ≈ 5·1017 ion/cm2 on the phase composition, chemical state, microhardness, wear resistance during friction against an abrasive and corrosion resistance of tungsten-free hard alloys of the TiC – TiNi system. Analysis of the structure, morphology, and chemical state of the samples before and after ion treatment was carried out using scanning electron and scanning probe microscopy, as well as X-ray photoelectron spectroscopy and X-ray diffraction analysis. The features of the change in the physicochemical state of the tungsten-free hard alloy of the “TiC – TiNi” system subjected to continuous ion beam irradiation are revealed. It has been experimentally established that ion-beam treatment provides an increase in microhardness, wear resistance and corrosion resistance of the hard alloy.

Objective: study of the stress-strain state of the wheel pair of a freight car in the process braking. Methods: to determine the stress-strain state of the wheel pairs of a freight car. Results: A volumetric finite element model of a wheel pair with rail sections was created using a finite element of the ten knot tetrahedron type, and maximum shear stresses and maximum equivalent stresses were determined according to the Mises and Dang Wan theory. Practical significance: It is shown that the maximum tangential stresses are observed at a point located at a depth of 4.5-5.3 mm below the rolling surface of the wheel. In case of emergency (short) braking, maximum stresses occur on the rolling surface of the wheel. During prolonged braking (movement of the train along a prolonged descent), maximum stresses occur at the point of transition from the disk to the rim on the inner side of the wheel, and the magnitude of these stresses is 2.5 times higher than in the emergency braking mode.

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Purpose: To review algorithm methodology for the addition of a new material to Qform Heat Treatment Module database with further adequacy assessment of the model by the method of the comparison its microhardness distribution with experimental data. Methods: Technique for the modeling of heat treatment (hardening) of samples from steels 60 and 40Cr in QFORM Heat Treatment software module has been developed. Algorithm for new material addition into software package database with adequacy further assessment for built model by the method of comparison of obtained data on distribution of microhardness over a section while process modeling in Qform with laboratory experiment data is presented. Results: Models of hardness distribution over the diametrical section of hardened cylindrical samples from steel 60 and adapted steel 40X, built into QFORM Heat treatment database. Comparison of modeling results with experimental data on hardness distribution of hardened samples. Practical significance: The results, obtained in this work, represent algorithm for replenishing the database of Qform Heat Treatment Module, created for the purpose to carry out heat treatment procedures for steels and nonferrous alloys. During experiment pursuing, it was established that the model of added to the database material demonstrates adequacy high degree. The expansion of the database of given materials of the given Module will allow its widespread application in the industries which activities are related to heat treatment.