Production of Quasicomposite Surface Layer of a Metal Material by Shock Wave Strain Hardening

Quite often in order to improve the performance of a product it is necessary to form a strengthened structure that will be extremely hard and have good plasticity at the same time. One way to meet this challenge is to apply shock wave mechanical hardening to produce micro- or nanocrystalline heterogeneous structures in homogeneous metals or alloys. A peculiar feature of such structure is its layer-by-layer for-mation with smooth transition between hard and plastic areas, which improves the performance of the strengthened item significantly When you are citing the document, use the following link http://essuir.sumdu.edu.ua/handle/123456789/3638

Theoretical Studies of Laws Nanostructuring and Heterogeneous Hardening of Steel Samples by Wave Intensive Plastic Deformation

Theoretical studies and calculations, allowing to define the required parameters of the wave deformation hardening, are performed in order to obtain heterogeneous hardened surface layer in steel samples. The conditions for the effective use of impact energy for elastic-plastic deformation of the processed material and the establishment of a deep hardened surface layer are revealed

Theoretical Studies of Laws Nanostructuring and Heterogeneous Hardening of Steel Samples by Wave Intensive Plastic Deformation

Theoretical studies and calculations, allowing to define the required parameters of the wave deformation hardening, are performed in order to obtain heterogeneous hardened surface layer in steel samples. The conditions for the effective use of impact energy for elastic-plastic deformation of the processed material and the establishment of a deep hardened surface layer are revealed

Microscopic analysis of electroerozyon chrome-containing powders

The method of electro-erosive dispersion (EED) is characterized by relatively low energy costs and ecological purity of the process and allows to obtain powders from wastes of production and consumption. Nevertheless, the wide use of the method of electro-erosive dispersion is hampered by the lack of reference material for optimizing the powder formation regimes and the properties of the obtained copper powders. For wide use of this method, extensive theoretical and experimental studies are required. The purpose of this work is to study their shape and condition of the surface of powders, obtained by electro-erosive dispersion of chromium-containing waste. By the method of scanning electron microscopy (SEM) on the Nova NanoSEM 450 device particles of powders, obtained by electro-erosive dispersion of chromium-containing waste, were investigated. It was found that the shape of the powder particles is due to the way, in which the material is ejected from the well in the EED process. It can be seen, that particles having a regular spherical or elliptical shape prevail in a powder. They are obtained by crystallization of molten material (liquid phase). The particles, formed during the crystallization of the boiling material (vapor phase), have an irregular shape, the size of an order of magnitude smaller, than the particles, formed from the liquid phase, and usually agglomerate with each other and on the surface of other particles. In the EES process, such particles are most susceptible to chemical and phase changes.Keywords: Chrome-containing waste, electroerosive dispersion, powder, form, surfac

X-ray Microanalysis of Sintered Nanocomposite Materials from Tungsten-containing Powders

Presents the results of microanalysis of the samples sintered from tungsten-containing powders. It is established that the main elements in the composition of the sintered samples from powders of the tungsten are carbon, iron, tungsten and cobalt

X-ray Diffraction Analysis of the Chromium-containing Electroerosion Powders of Micro - and Nanoparticles

Presents the results of a study of x-ray analysis of the powder obtained by electro erosion dispersing of waste nichrome H15N60 brand in kerosene lighting. The major phases in Nickel-chromium powder obtained by electroerosion dispersion method in kerosene lighting are Ni and Si2O

Deposition of Alumina-titania Nanostructured Coating by a New Multi-chamber Gas-dynamic Accelerator

The aim of the study was to characterize alumina-titania (Al[2]O[3]:Ti wt ratio = 87:13) coatings were deposited by a new multi-chamber gas-dynamic accelerator on a grit blasted steel substrate. The aluminatitania coatings were characterized using scanning electron microscopy, X-ray diffraction techniques and Vickers hardness tester at a test load 200 g. The coating was well-adhered onto corrosion-resistant steel substrate. Obtained coatings possessed a unique microstructure consisting of fully melted regions with the microstructure similar to a typical thermal sprayed lamellar morphology and areas comprising unmelted or partially melted particles. The dense alumina-titania coatings with hardness of 657 ± 70 HV0.2 and porosity of less than 0.6% have been prepared by a new multi-chamber gas-dynamic accelerator

X-ray Microanalysis of Sintered Nanocomposite Materials from Tungsten-containing Powders

Presents the results of microanalysis of the samples sintered from tungsten-containing powders. It is established that the main elements in the composition of the sintered samples from powders of the tungsten are carbon, iron, tungsten and cobalt

Investigation of the Phase Composition of Samples Sintered from Tungsten-containing Composite Micro - and Nanopowders

Presents the results of research of phase composition of samples sintered from tungsten-containing composite micro- and nano-powders obtained by mixing a powder VK8 (70 %) and PRS powder (30 %) obtained in kerosene lighting. It is established that the main phase of the sintered sample are the WC and Fe3С

X-ray Diffraction Analysis of the Chromium-containing Electroerosion Powders of Micro - and Nanoparticles

Presents the results of a study of x-ray analysis of the powder obtained by electro erosion dispersing of waste nichrome H15N60 brand in kerosene lighting. The major phases in Nickel-chromium powder obtained by electroerosion dispersion method in kerosene lighting are Ni and Si2O