It is advisable to consider the application of the radial-shear rolling process mainly towards the end of the production cycle of products. ; Lezhnev, S.N. This research was funded by the Science Committee of the Ministry of Education and Science of the Republic of Kazakhstan (Grant No. Since radial-shear rolling is a cross type of rolling, it is advisable to study the equivalent strain not only in the longitudinal, but also in the cross-section of the workpiece—this will allow to evaluate not only the numerical values of the parameter, but also the nature of its distribution over the cross-section during … Visit our dedicated information section to learn more about MDPI. Therefore, rolling to smaller diameters from a single heating is not possible. ; Enikeev, N.A. In-situ study of heavy ion irradiation induced lattice defects and phase instability in β-Zr of a Zr–Nb alloy. providing turbulence and non-monotonous deformations that contribute to the formation of high-angle intergrained boundaries. Maksimkin, O.P. Connecting two or more cities: an interurban railroad. The cutting was carried out on a high-precision cutting machine Brilliant-220 (ATM Gmbh, Mammelzen, Germany) with a water-cooled abrasive wheel at a speed of 500 rpm and a feed of 15 microns/s. This type of structure is the most optimal for achieving high properties and is suitable for further SPD processing in the nanostructured region. Please let us know what you think of our products and services. Radial scar (RS) is a pseudo-infiltrative lesion characterized by a fibro-elastotic core with entrapped ducts and surrounding radiating ducts and lobules demonstrating a range of epithelial hyperplasia. This method largely implements the necessary conditions described above for the formation of the UFG structure. Effect of neutron irradiation on microstructure and properties of austenitic AISI-321 steel, subjected to equal-channel angular pressing. To find out more, see our Privacy and Cookies policy. ; Mitamura, T.; Terasawa, M.; Fukami, T. Microstructure and mechanical properties of neutron-irradiated ultra-fine-grained SUS316L stainless steels and Ni–W alloys. Please note that many of the page functionalities won't work as expected without javascript enabled. Thus, it can be argued that UFG structure is obtained to a depth of at least 2 mm with a total diameter of 20 mm. Zinkle, S.J. To create a radial gradient you must define at least two color stops. Involving relationships between cities: an interurban rivalry. The production of ultrafine-grained and nanostructured state is possible either by sintering ultradispersed powders, or by the method of severe plastic deformation (SPD). adj. The phase composition was studied using the XRD method on the automated high-resolution θ-θ multi-purpose X-ray diffractometer (XRD) SmartLab (Rigaku Corp., Tokyo, Japan) with expert system Guidance software, 1.5 kW sealed X-ray tube, CBO optics, D/teX Ultra 250 silicon strip-detector (Rigaku Corp., Tokyo, Japan). The statements, opinions and data contained in the journal, © 1996-2021 MDPI (Basel, Switzerland) unless otherwise stated. The use of SPD eliminates the presence of residual porosity characteristic of sintering powders, but has more stringent requirements for the process conditions: achieving high degrees of strain for grain grinding (ε > 6–8); formation of high hydrostatic pressure that prevents sample destruction and annihilation of crystal lattice defects (1 GPA or higher); deformation at temperatures about 0.3 of the melting point and below to exclude the phase transition α→α + β in a Zr-based alloy [. ; Colbert, C.; Houghton, Z.; Snuggerud, R.; Gaston, J.W. As in the preferred embodiment, a radial shear layer, orthogonal to the impeller axis of rotation, comprises radial vortices in fractal turbulence sustained by the radial counterflow forcing regime of the centrifugal impeller and the axial suction pump. MDPI stays neutral with regard to jurisdictional claims in published maps and institutional affiliations. Therefore, in radial stress, pressure difference is acting perpendicular to the wellbore wall, along the wellbore … Radial Distance from Centre of Rotation when Mobilised Shear resistance of Soil is Given calculator uses radial_distance = Mobilised shear resistance of soil /(( Weight of the body in newtons * Distance )/ Length of slip arc ) to calculate the radial distance, The Radial Distance from Centre of Rotation when Mobilised Shear … ; Bulanova, T.M. The phase composition of the initial bar was studied on the DRON-6 diffractometer (RPE “Thunderbird”, Saint Petersburg, Russia). Collective Use Office, AEO Nazarbayev University, 53 Kabanbay Batyr Ave, Nur-Sultan 010000, Kazakhstan, Metal Forming Institute, Częstochowa University of Technology, ul. Moreover, it is very convenient application because no plane … Etienne, A.; Radiguet, B.; Cunningham, N.J.; Odette, G.R. The structure of the central region has also changed. 30, Temirtau 101400, Kazakhstan, RSE National Nuclear Center of the Republic of Kazakhstan, Beybit atom st. 2B, Kurchatov 071100, Kazakhstan, JSC Volkovgeologiya (NAC Kazatomprom), Bogenbay Batyr str. Shamardin, V.K. ; Rybalchenko, O.V. Geomedicine. ; Yarovchuk, A.V. Notice in this image there is both speed and directional shear as both the angle and the length of the wind vectors are changing with height. "a total system of performance". This alloy is used as a material for shells (nuclear fuel cladding tubes) and end plugs, as well as spacer grids of fuel elements of thermal neutron reactors (PWR, WWER). Coaxial disk armatures, counter-rotating through an axial magnetic field, act as electrolysis electrodes and high shear centrifugal impellers for an axial feed. Yu, H.; Dong, Q.; Yao, Z.; Zhang, H.K. Example of Radial Gradient: This phenomenon is typical for metals and alloys of the hexagonal close-packed (HCP) system. The appearance of the mill is shown in. Knapiński, M.; Dyja, H.; Kawałek, A.; Kwapisz, M.; Koczurkiewicz, B. Investigation of Ultrasound-Measured Flow Velocity, Flow Rate and Wall Shear Rate in Radial and Ulnar Arteries Using Simulation. Also, a fixed FlowNet grid was constructed in the cross section of the workpiece, which, unlike the finite element mesh, is never rebuilt, but only deformed according to the nature of the metal flow. radial pulse synonyms, radial pulse pronunciation, radial pulse translation, English dictionary definition of radial pulse. Turbulence regulation by shear flow or velocity shear (radial electric field shear ) has been commonly observed in nature and the laboratory magnetized plasmas. In order to obtain a bar with a modified radiation-resistant outer layer, an experiment of radial-shear rolling under the most stringent conditions was carried out. The main purpose of this work is to evaluate the applicability of the radial-shear rolling method for grinding the structure of a zirconium alloy to a level that theoretically provides an increase in its radiation resistance. Lopatin, N.V.; Salishchev, G.A. These two facts cause a high interest in the study of the influence of this method on changes in the structure and properties of the zirconium alloy and testing of radiation resistance of the resulting structure in the future. In the surface zone (80–100% of the radius from the center), the maximum effect of shear deformation is observed, here the strain level is 29–30.6. Segal, V.M. The analysis of the metal force on the rolls during rolling at the SVP-08 mill of the Zr-1% Nb alloy blanks was also performed. Wellbore pressure and pore pressure both stem from fluid pressure acting equally in all directions. Radial distribution function of Lennard-Jones fluids in shear flows from intermediate asymptotics. The Radial Thickness of the Element when Rotation Due to Shear on a Arch Dam is Given formula is defined as thickness in a particular direction and is represented as T = Fs * K /(E * θ) or thickness = Shear Force * Constant K5 /(Elastic Modulus of Rock * Angle of Rotation).Shear Force is the force which causes shear deformation to occur in the shear … An increase in the strain rate from 0.5 to 15 s. As the temperature and strain rate increase, the nature of the flow curves changes. Subscribe to receive issue release notifications and newsletters from MDPI journals, You can make submissions to other journals. ; Abramova, M.M. The main concept of creating a new generation of nuclear reactors is to increase their safety level, increase their service life and power [, This is especially true for the materials of the nuclear fuel cladding tubes and end plugs of the reactor fuel elements, because they separate the nuclear fuel from the reactor interior. These disadvantages can be eliminated by using a method of intense deformation, such as radial-shear rolling, which also allows to obtain a UFG state, but already in long round bars with some features of the structure distribution [, During radial-shear rolling, in the deformation zone a stress state scheme close to all-round compression with large shear deformations and high metal flow turbulence is implemented.

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