Influence of the regime of plastic deformation on the magnetic properties of single-crystal silicon Cz-Si

Dmitriev, A. I.; Скворцов, А. А.; Коплак, О. В.; Моргунов, Р. Б.; Proskuryakov, I. I.

doi:10.1134/s1063783411080099

Cited by 14 publications

(12 citation statements)

References 19 publications

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“…Despite the radical difference in the methods of obtaining, in this case, one can also observe the sufficiently uniform distribution of carbide grains in the metal component as well as the formation of WC solid solutions in Co or Ni (though to a lesser extent than at sintering). In this case, the dependence of mechanical properties on phase composition remains (Dmitriev et al, 2011;Orlov et al, 2003).…”

Section: Resultsmentioning

confidence: 99%

The Features of Detonation Spraying Technology for Tungsten Carbide Based Coatings

Baldaev¹,

Khamitsev²,

Baldaev³

et al. 2019

PTQ

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The authors studied the effect of key parameters of detonation spraying process on tungsten carbidebased coatings and their mechanical properties, microstructure, and phase composition. Two main tasks are solved when developing the technology for spraying the carbide-containing materials. The relationship is established between the phase composition of tungsten-based coatings and their strength, hardness, and substrate adhesion. It was established that the WC dissolution in the metal phase promotes the increase of substrate adhesion as well as strength and hardness of coating material. A procedure of spraying coatings in the reduction mode is proposed: i.e., using working gas mixtures with excess acetylene. It prevents the decarbonization of WC carbides under the action of detonation products and environment. The phase composition heterogeneity (both along with the layer thickness and along the spraying spot diameter) is established. This depends on a complex of factors that determine the intensity of heat removal from the area of layer formation. For optimizing the structure and the mechanical characteristics of the coating, we need to control decarbonization of carbide component (WC) and formation of Ni (W) solid solution at different stages of spraying. Even a minor departure from carbon content leads to either appearance of graphite or formation of the fragile phase (Co3W3C), thus strongly reducing the mechanical properties.

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Section: Resultsmentioning

confidence: 99%

The Features of Detonation Spraying Technology for Tungsten Carbide Based Coatings

Baldaev¹,

Khamitsev²,

Baldaev³

et al. 2019

PTQ

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“…Traditionally, the heat flows from gas to the body, and then the problems of the theory of thermal conductivity in a body with boundary conditions in the form of these heat flows were formed and solved separately which led to the errors in temperatures of up to 50%. The joint solution of these two problems faces the difficulties associated with the following features: the physics of heat transfer in the gas and in the body are described by the various partial differential equations; the type of these equations is different; the viscous gas dynamics equations are most often stationary, and the equations of thermal conductivity are non-stationary (Skvortsov et al, 2000;Dmitriev et al, 2011;Amirgaliyev et al, 2017). In addition, if the streamlined bodies are anisotropic, then the difficulties associated with anisotropy are added, namely: tensor nature of thermal conductivity as a result of which the thermal conductivity equations contain the mixed derivatives; setting and solving only the multidimensional nonstationary problems; the boundary conditions of the second kind contain all the components of the temperature gradient (Kazanin et al, 2019;Korshunov et al, 2016).…”

Section: Introductionmentioning

confidence: 99%

Approximate Analytical Solution of the Problem of Conjugate Heat Transfer Between the Boundary Layer and the Anisotropic Strip

Формалев¹,

Колесник²,

Kuznetsova³

2019

PTQ

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Optimization of technological processes in metallurgy related to transfer and use of heat energy makes more complicated demands for calculation of heat exchange. Therefore, the work, the approximate analytical method for solving the conjugate problems of viscous gas-dynamic boundary layer and thermal conductivity in the anisotropic strip, has been developed. The paper uses modern numerical methods for solving differential equations in partial derivative and analytic methods on the basis of an integral transform of Fourier and Laplace. Boundary equations have been solved analytically with certain simplifications, and the problem of anisotropic heat conduction has been solved analytically. The heat flows are determined analytically by the longitudinal variable at the interface boundary. It has been established that temperature increase of the external surface contributes to that all factors directly impacting on the magnitude of heat flows act towards their reduction. The analytical solution for the problem of thermal conductivity in the anisotropic strip with a general type of anisotropy when the heat flows from the boundary layer are determined at the boundaries is obtained. The conducted research for the temperature of external boundary and heat flow from gas to it demonstrates that with increasing the degree of longitudinal anisotropy the surface temperature of the strip downstream increases from increasing longitudinal heat conduction An original conjugation method using the continuous heat flows, and temperatures at the interface boundary is found. The numerical results for the heat flows and temperatures at the interface boundary have been obtained and analyzed.

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“…As a result, the construction operates under difficult stress conditions (allround compression in the rear part, longitudinal compression in the front part, shear at the contact boundary of the shell and the rod, and in the region of change in the cross-section of the shell, etc. ), which, however, at a first approximation, can be reduced to a simple one-dimensional case of loading a variable cross section composite rod (Dmitriev et al, 2011;Skvortsov et al, 2000). The task of the calculation in such a simplified model is to determine the tensile/compression stresses in the shell and in the rod, as well as to determine the tangential stresses in the zone of their contact (Yasnitskii, 1989;Gorchakov et al, 2004;Skvortsov et al, 2012).…”

Section: Introductionmentioning

confidence: 99%

Design Calculation Technique for Thick-Walled Composite Constructions Operating Under High-Speed Loading

Babaytsev¹,

Rabinskiy²

2019

PTQ

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The scientific paper presents a technique for calculating a thick-walled axially symmetrical construction consisting of a steel rod (reinforcing component) and an external thick-walled shell made of carbon fiber. The construction is loaded with linear load distributed along its length, associated with the operating external pressure, and inertial forces. The technique is based on a one-dimensional model of a composite rod of variable cross-section, roughly taking into account transverse deformations, which is necessary when analyzing a thickwalled construction operating under pressure. In the proposed approach, the geometry of the product is divided into sections and approximated by fragments in the form of truncated cones and, in the particular case, in the form of cylinders. As a result of calculations, the distribution of normal tensile/compression stresses in the shell and in the reinforcing rod, as well as tangential stresses at the boundary of their contact, are determined. As a result of test calculations, a fairly good consistency of the considered one-dimensional model with refined finiteelement modeling is shown. It has been established that the concentration of shear stresses is realised due to the presence of substantially inhomogeneous deformations in the areas of sharp changes in geometry, a reduction in the radius of the shell (the appearance of edge effects), and in the area of a sharp increase in the radius of the bevel of the shell where external pressure is in place.

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Influence of the regime of plastic deformation on the magnetic properties of single-crystal silicon Cz-Si

Cited by 14 publications

References 19 publications

The Features of Detonation Spraying Technology for Tungsten Carbide Based Coatings

The Features of Detonation Spraying Technology for Tungsten Carbide Based Coatings

Approximate Analytical Solution of the Problem of Conjugate Heat Transfer Between the Boundary Layer and the Anisotropic Strip

Design Calculation Technique for Thick-Walled Composite Constructions Operating Under High-Speed Loading

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