Modification of Ni-Based Plasma Detonation Coatings by a Low-Energy DC E-beam
Автор(ы): Alontseva D. L.*Krasavin A.*Pogrebnyak A. D.*Russakova A. V.*
Объем документа: С. 867-870
МРНТИ: 29.19.21
Ключевые слова: плазменно-детонационные покрытия*модификация поверхностей*структурно-фазовые состояния покрытий*износостойкость покрытий*микротвердость*
Реферат: The paper presents the study of Ni-based coatings deposited by plasma detonation onto a steel substrate after direct current low-energy electron beam irradiation and proposes explicit parameters of the electron beam for modification of coatings by irradiation. The choice of irradiation modes is based on the calculation of the temperature profile in Ni-Fe two-layer absorbents using numerical simulation methods. It was found that exposure of coatings to irradiation of the recommended modes leads to the evolution of the structural-phase state of coatings and a substantial improvement of the performance properties of modified surfaces. The wear resistance of modified surfaces increases by 3 times, the microhardness increases by an average of 25%.
The Structure-Phase Compositions and Properties of Plasma-Detonation Ni and Co- Based Powder Alloys Coatings
Автор(ы): Alontseva D. L.*Russakova A. V.*
Объем документа: С. 94-99
МРНТИ: 29.19.16
Ключевые слова: структурно-фазовый состав покрытий*материалы покрытий*методы рентгеновской дифракции*методы просвечивающей электронной микроскопии*методы атомно-силовой микроскопии*
Реферат: This paper presents new results of transmission electron microscopy (TEM), X-ray diffraction (XRD) and atomic force microscopy (AFM) investigation of the structure-phase compositions of thick (150 mkm) coatings on the base of Ni and Co deposited by plasma-detonation on steel substrates. The phase structures and morphology of precipitation from solid solutionare defined. Factor k is defined in the Hall-Petch equation for the coating materials. The existence of a diffuse zone in the coating layer next to the substrate is established, the thickness of this zone is defined.
The Effect of Deformation and Irradiation with High-Energy Krypton Ions on the Structure and Phase Composition of Reactor Steels
Автор(ы): Russakova A. V.*Alontseva D. L.*Kolesnikova T.*
Реферат: The paper presents some results of a complex research of 12Cr18Ni10 Tistainlesssteel in the initial, deformed an dir radiated ( E=130MeV, Fmax=9x1015 ions/сm2) state susing magnetometry, X-ray diffraction and scanning electron microscopy with EBSD -analysis. Application of the EBSD method revealed differences between thenon-irradiated and irradiated 12Cr18Ni10Ti steel specimens consisting in the fact that in the surface layer of an irradiated sample alfa- and epsilon -phases are formed. It was established that the fluence value affects the amount of magnetic alfa-phase. The study of the martensite alfa-phase morphology showed that in the deformed steel specimens there is alfa\'-martensite of two scale levels.
Surface Hardening of 18CrNi3MoA-SH Steel with Heating in Electrolytic Plasma
Реферат: We investigated 18CrNi3MoA-Sh steel hardened by electrolyte-plasma processing method. The comparative analysis of microstructure, microhardness and wear-resistance of the samples in initial state and after electrolyte-plasma treatment is presented. It was found out that 18CrNi3MoA-Sh steel microstructure has fine-grained martensite-bainite structure after the treatment. It was set that 18CrNi3MoA-Sh steel possesses high wear-resistance after electrolyte plasma treatment so that technology is characterized by low power consumption and cost price. Scanning analysis of transient surface demonstrated that in the course of details\' electrolyte-plasma heating chemical surface modification takes place along with tempering. Microhardness increases 2-2.5 times more before treatment that indicates the technology efficiency. This method advantages are minor energy expenditure in the time of tempering high speeds, possibility of local surface processing especially of large size details with complicated shape.
Way of hardening surface coating of details from steel 30CrMnSi in electrolytic plasma
Реферат: The present work is devoted research of influence of various modes of electrolytic plasma cementation on feature of change a structurally-phase conditions and hardening of a constructional steel 30CrMnSi. It is chosen scientifically proved low-power and resources-economy a processing kind which leads to formation stable ferrite-perlites structures, provides higher mechanical properties. Cementation process carried out with selection of different modes of electrolytic-plasma processing in the electrolyte containing water solution of 10 % of sodium carbonate and 10 % of glycerin. As the basic methods of research in work we used metallographic the analysis with microscope application <NEOPHOT-21>, X-ray analysis on diffractometer X\'PertPRO in monochromatic CrK - radiation, tests for microhardness for device PMT-3. It is established that a microstructure of samples steel 30CrMnSi at different modes of processing consist from alfa-phases, particle carbides. Microhardness of the initial sample makes approximately 3000 MPa, and after processing its microhardness makes 6100 MPa that speaks about of a processing mode. The developed technology of electrolytic-plasma cementation of constructional steels in the conditions of the arc category in electrolyte is the optimal as provides reliable quality and demanded properties of details, working in variable loadings and often exposed to wear, forms the strengthened, modified surface coating.
Influence of Regimes Electrolytic Plasma Cementation on the Mechanical Properties of Steel 12Cr18Ni10Ti
Автор(ы): Skakov M. K.*Kurbanbekov S.*Sheffler M.*
Реферат: In the present work the results of electrolytic-plasma treatment influence on the mechanical properties and structural-phase condition of steel\'s 12Cr18Ni10Ti surface layers. In the work, the mechanical characteristics of steel\'s surface layers are investigated, cemented in electrolytic plasma with the composition 10 % Nа2CO3 and 10 % С3Н8О3. The operational parameters for the processing are determined. The optimal content of components in saturating mixtures plasma by cementation defined. According to the study it is found that, after electrolyte plasma processing, high hardness increased in 2-2.5 times more than in the original condition. The hardened layer with thickness 30-65 чm is formed. It is shown that after the electrolyte-plasma processing of steel 12Cr18Ni10Ti, microstructure contains particles carbides and has fine-grained martensitic structure. The advantages this method are: small energy consumption high speeds annealing opportunity of local surface processing details complex configuration, operating in the conditions intensive loads, easy implementation process.
Influence of Electrolyte Plasma Treatment on Structure, Phase Composition and Microhardness of Steel Р6М5
Реферат: Microhardness of nitrated and carbonitriding in electrolyte plasma steel Р6М5 surface layers are investigated in the research. It shows perspectiveness of the cutting tool electrolyte-plasma treatment technology. Operating conditions for the technology realization are defined. It was also indicated the desired content of components in saturating mixtures by nitriding and carbonitriding. Comparative research of structure, phase composition of fast-cutting P6M5 steel modified surface layers after electrolyte plasma treatment was carried out by scanning-electron and light microscopy, and X-ray structure analysis methods. The way of electrolytic plasma nitriding in cathodic mode, to provide fast-cutting steels which allows for modification the surface and high kinetic efficiency the process diffusion saturation. It was established that as a result of nitriding and nitrocarburizing in plasma electrolyte has been a significant increase in microhardness in the surface layers of steel Р6M5.
Influence of regimes electrolytic-plasma processing on phase structure and hardening of steel 30CrMnSi
Реферат: The present work is devoted research of influence of various modes of electrolytic-plasma cementation on feature of change a structurally-phase conditions and hardening of a constructional steel 30CrMnSi. It is chosen scientifically proved low-power and resources-economy a processing kind which leads to formation stable ferrite-perlites structures, provides higher mechanical properties. Cementation process carried out with selection of different modes of electrolytic-plasma processing in the electrolyte containing water solution of 10 % of sodium carbonate and 10 % of glycerin. The developed technology of electrolytic-plasma cementation of constructional steels in the conditions of the arc category in electrolyte is the optimal as provides reliable quality and demanded properties of details, working in variable loadings and often exposed to wear, forms the strengthened, modified surface coating.
Changes of structural-phase condition in 18CrNi3MoA-Sh Steel after elektrolyte-plasma processing
Реферат: The research shows the results of electrolyte-plasma treatment influence on structure phasestate, mechanical properties and wear-resistance of drilling tool steel samples. The comparative analysis of microstructure, microhardness and wear-resistance of the samples in initial state and after electrolyte-plasma treatment is presented. It was found out that 18CrNi3MoA-Sh steel microstructure has fine-grained martensite-bainite structure after the treatment. It was set that 18CrNi3MoA-Sh steel possesses high wear-resistance after electrolyte-plasma treatment so that technology is characterized by low power consumption and cost price. The initial state microhardness is 2800 MPa upon the average. Microhardness increases 2-2.5 times more before treatment that indicates the technology efficiency.
Changes of Mechanical Properties of Steel 12Cr18Ni10Тi After Electrolytic-Plasma Cementation
Автор(ы): Kurbanbekov S.*Skakov M. K.*Zhurerova L.*Sheffler M.*Naltaev A.*
Реферат: In the present work the results of electrolytic-plasma treatment influence on the mechanical properties and structural-phase condition of steel\'s 12Cr18Ni10Ti surface layers. In the work, the mechanical characteristics of steel\'s surface layers are investigated, cemented in electrolytic plasma with the composition of 10 % Nа2CO3 and 10 % С3Н8О3. The operational parameters for the processing are determined. The optimal content of components in saturating mixtures of plasma by cementation is defined. According to the study it is found that, after electrolyte plasma processing, high wear resistance and hardness increased in 2-2.5 times more than in the original condition. The hardened layer with thickness 30-65 чm is formed. It is shown that after the electrolyte-plasma processing of steel 12Cr18Ni10Ti, microstructure contains particles of carbides and has a fine-grained martensitic structure.