Features of tribomodifi cation of steel surface layer and formation of wear-resistant ceramic-metal coating on friction surface

2020 ◽  
pp. 217-223
Author(s):  
L.B. Leont’ev ◽  
A.L. Leont’ev ◽  
N.P. Shapkin ◽  
V.N. Makarov ◽  
P.A. Nikiforov
Keyword(s):  
Mechanical Properties ◽  
Surface Layer ◽  
Chemical Composition ◽  
Friction Surface ◽  
Steel Surface ◽  
Metal Layer ◽  
Metal Coating ◽  
Friction Surfaces ◽  
Silicon Oxygen ◽  
Resistant Ceramic

The features of the tribomodification process of friction surfaces of steel 40Kh with modified vermiculite are studied. The mechanism for forming of ceramic-metal coating is refined, the chemical composition and mechanical properties of the coating are determined. It is found that ceramic-metal layer 6.0...7.5 μm thickness is formed on the friction surface, which contains large amount of carbon, silicon, oxygen and minimum amount of iron (only 8...9 %). The alloying depth of the surface layer with elements that make up the modified vermiculite reaches 0.25 mm

scholarly journals INFLUENCE OF VACUUM ACTIVATED DIFFUSION CHROMING ON MECHANICAL PROPERTIES OF THE SURFACE OF STEEL 25X1MF

2020 ◽  
pp. 132-138
Author(s):  
S.G. Rudenkyi ◽  
V.I. Zmij ◽  
N.F. Kartzev ◽  
A.A. Korneev ◽  
A.V. Kunchenko ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Surface Layer ◽  
Sodium Chloride ◽  
Abrasive Wear ◽  
Steel Surface ◽  
Chromium Content ◽  
Chromium Plating ◽  
Untreated Material

In the work, the surface of samples made of 25X1MF steel was saturated with chromium. For this, the method of vacuum activated diffusion chromium plating was used. In this process, sodium chloride was used as an activator. It was found that vacuum activated diffusion chromium plating of samples made of 25Kh1MF steel leads to the formation of a surface layer containing from 87 to 97 wt.% of this element. It was found that an increase in the temperature of the process and its duration leads to an increase in the chromium content on the surface of the samples. The tests showed that in the case of cavitations-erosion effects on the surface of chrome-plated samples of steel 25X1MF they have higher resistance. With abrasive wear, the resistance of the chrome-plated steel surface is 1.8 to 3 times higher compared to untreated material.

scholarly journals MODEL ANALYSIS OF ELASTIC PROPERTIES OF COATING

2014 ◽  
Author(s):  
Sergiy Timofeyev
Keyword(s):  
Mechanical Properties ◽  
Molybdenum Disulfide ◽  
Composite Coating ◽  
Elastic Properties ◽  
Friction Surface ◽  
Deformation Theory ◽  
Physical And Mechanical Properties ◽  
Adequate Model ◽  
Elastoplastic Properties ◽  
Friction Surfaces

The article describes a method of solving the problem of designing the friction surfaces withcomposite coatings. Despite the fact that many scientists have investigated the effect of coatings on theproperties of the items during the exploitation, however, has not yet been carried out a detailed study ofelastoplastic properties of the coating to the copper-containing material with different concentrations ofultrafine additions of copper, nickel, molybdenum disulfide. Elastoplastic properties of such materials isusually described by the relations of the deformation theory of plasticity.It is proved that the modeling of physical and mechanical properties, and varying the coatingcomposition can achieve a favorable combination of properties of the surface and the substrate. Proposed ofdesigning friction surface with composite coating, development an adequate model of the interaction ofsurfaces, which makes it possible to judge which components need to enter into the coating to obtain thedesired properties.

Change of Structure and Mechanical Properties of R6M5 Steel Surface Layer at Electrolytic-Plasma Nitriding

2014 ◽  
Vol 1040 ◽  
pp. 753-758 ◽  
Author(s):  
Mazhyn Skakov ◽  
Bauyrzhan Rakhadilov ◽  
Erlan Batyrbekov ◽  
Michael Scheffler
Keyword(s):  
Mechanical Properties ◽  
Surface Layer ◽  
High Speed ◽  
Steel Surface ◽  
Plasma Nitriding ◽  
Cutting Tools ◽  
High Speed Steel ◽  
High Hardness ◽  
R6m5 Steel ◽  
Temperature Plasma

In the article changes in the structure and mechanical properties of R6M5 steel surface layer after electrolytic-plasma nitriding are shown. The optimal mode of electrolytic-plasma nitriding of R6M5 high-speed steel in electrolyte based on carbamide, which allows saturation of the surface with nitrogen from low-temperature plasma and get the modified layer of high hardness and wear-resistance. It is established, that after electrolytic-plasma nitriding reduced R6M5 steel wear rate and increases its resistance to abrasive wear. Perspectivity of use an electrolytic-plasma nitriding method to improve performance cutting tools made from R6M5 steel is shown.

Research about Relation between the Microstructures and Mechanical Properties of Metal Coating Layers

2014 ◽  
Vol 216 ◽  
pp. 169-174
Author(s):  
Arthur Olàh ◽  
Mircea Horia Tierean
Keyword(s):  
Mechanical Properties ◽  
Heat Treatment ◽  
Wear Resistance ◽  
Chemical Composition ◽  
Metal Coating ◽  
Laser Heat Treatment ◽  
Laser Heat ◽  
Coating Layers ◽  
Microstructures And Mechanical Properties

The paper presents the research about the correlation between the microstructures and mechanical properties of metal coating layers after laser heat treatment. The research was made with eight types of electrodes for welding coating. Laser heat treatment was applied after coating. Evaluation of results was made by observing the microstructures with metallographic microscopy, SEM/EDX and the mechanical properties were obtained by microhardness and wear resistance. The goal of this research is to study the influence of the laser heat treatment on wearing resistance of metal coating layers. Results reveal the influence of microstructures and chemical composition of used electrodes on microhardness and wear resistance of metal coating layers.

scholarly journals Mechanical Properties of Metal Coating Layers after Laser Heat

2020 ◽  
Vol 21 (2) ◽  
pp. 72-77
Author(s):  
Arthur Olah
Keyword(s):  
Mechanical Properties ◽  
Heat Treatment ◽  
Wear Resistance ◽  
Chemical Composition ◽  
Metal Coating ◽  
Laser Heat Treatment ◽  
Laser Heat ◽  
Coating Layers

The goal of this research is to study the influence of the laser heat treatment on wearing resistance of metal coating layers. Results reveal the influence of microstructures and chemical composition of used electrodes on microhardness and wear resistance of metal coating layers. Laser heat treatment was applied after coating. Evaluation of results was made by observing the microstructures with metallographic microscopy, SEM/EDX and the mechanical properties were obtained by microhardness and wear resistance.

scholarly journals Microstructure and Properties of the Copper Alloyed with Ag and Ti Powders Using Fiber Laser

Materials ◽  
2020 ◽  
Vol 13 (11) ◽  
pp. 2430 ◽  
Author(s):  
Mariusz Krupiński ◽  
Paulina Ewelina Smolarczyk ◽  
Mirosław Bonek
Keyword(s):  
Mechanical Properties ◽  
Surface Layer ◽  
Chemical Composition ◽  
Abrasion Resistance ◽  
Melting Zone ◽  
Hardness Measurement ◽  
Copper Surface ◽  
Laser Alloying ◽  
Microstructure And Mechanical Properties ◽  
The Impact

The scope of the work covers the development of the relationship between the chemical composition of surface-modified copper and the diffusion of alloy elements as well as the microstructure and mechanical properties. This article presents the impact of laser alloying with titanium and silver powders on the microstructure and mechanical properties of copper. In order to investigate the phenomena occurring during the laser alloying process, microstructural studies were performed using scanning electron microscopy (SEM), optical microscopy, and energy dispersive x-ray spectroscopic (EDS) analysis of the chemical composition in micro-areas. In addition, to test the properties of the resulting alloy, abrasion resistance, hardness measurement at low loading force, and conductivity measurements were performed. As a result of alloying with Ag and Ti powders, three distinct zones were indeed recognized: re-melting zone (RZ), diffusion zone (DZ), and heat affected zone (HAZ). The surface modification that results from laser alloying increases the hardness as well as the abrasion resistance of the material. Overall, it was found that laser alloying with Ti powder increased the strength of the copper surface layer due to the formation of intermetallic phases (Cu3Ti2). It was also found that laser alloying with Ag powder changed the mechanical properties of the surface layer due to the solid solution strengthening.

Impact of Electrolytic-Plasma Nitriding on 34CrNi1Mo Steel Surface Layer Properties

2014 ◽  
Vol 698 ◽  
pp. 439-443 ◽  
Author(s):  
Mazhyn Skakov ◽  
Lyudmila Yerygina ◽  
Michael Scheffler
Keyword(s):  
Mechanical Properties ◽  
Surface Layer ◽  
Structural Steel ◽  
Steel Surface ◽  
Plasma Nitriding ◽  
Plasma Hardening ◽  
Temperature Force ◽  
Heating Mode

The present work is devoted to the research into the microstructure and microhardness of structural steel 34CrNi1Mo after electrolytic-plasma nitriding in a cathode heating mode. The technology of electrolyte-plasma hardening provides a reliable quality and the required mechanical properties of the products which are often subjected to wear and temperature-force actions.

scholarly journals MATHEMATICAL MODELING OF GROUND FRICTION SURFACE WEAR PROCESS

2016 ◽  
Vol 2016 (2) ◽  
pp. 6-12
Author(s):  
Сергей Бишутин ◽  
Sergey Bishutin ◽  
Анатолий Суслов ◽  
Anatoliy Suslov
Keyword(s):  
Mathematical Modeling ◽  
Wear Resistance ◽  
Surface Layer ◽  
Friction Surface ◽  
Structural Phase ◽  
Surface Wear ◽  
Factors Affecting ◽  
Wear Process ◽  
Force Impact ◽  
Friction Surfaces

Many factors affecting considerably surface wear cannot be taken into account within the bounds of existing approaches to the mathematical description of this process. It is wellknown that the modes of finish grinding have a significant influence upon wear resistance of a friction surface. It is explained, for example, by differences in a structural – phase state of a surface layer formed in the course of thermal and force impact of abrasion. Therefore, for reliable fore-casting of the resource of many tribo-couplings it is necessary to estimate friction surface wear resistance taking into account the influence of conditions and modes of finishing abrasion. The mathematical modeling of the process un-der consideration allowed obtaining an equation for the computation of a wear rate of run-in ground friction surfaces and nonrunin ones in which pressure in a contact, slip velocity, abrasion modes, form errors in a friction surface and also a state of a surface layer and a position error of a friction surface in a coupling are taken into account. Experimental researches have confirmed a possibility of use in practice the mathematical depen dences obtained. The researches carried out allow forecasting more reliably ground friction surface wear of machinery and mechanisms.

scholarly journals INVESTIGATION INTO THE MECHANICAL PROPERTIES AND METAL CREAKS OF A DIESEL LOCOMOTIVE WHEEL

Transport ◽  
2010 ◽  
Vol 25 (3) ◽  
pp. 287-292 ◽  
Author(s):  
Virgilijus Jastremskas ◽  
Gediminas Vaičiūnas ◽  
Olegas Černašėjus ◽  
Vitalijus Rudzinskas
Keyword(s):  
Mechanical Properties ◽  
Chemical Composition ◽  
Western Europe ◽  
Indentation Depth ◽  
Metal Layer ◽  
Current Investigation ◽  
Diesel Locomotive ◽  
Wheel Surface ◽  
Hardness Ratio

After JSC ‘Lithuanian Railways’ (AB ‘Lietuvos geležinkeliai‘) bought new Siemens ER20 CF locomotives produced in Western Europe and brought them into service, some of them have already done about 170–200 thousand km that caused the appearance of indentations of an inadmissible size (the depth is more than 3 mm, the length – 10 mm) the elimination of which turning cutting results in up to 20 mm loss of a wheel. Having grounded off the metal layer of indentation depth, indentation reappears (metal ‘flakes off') and needs to be removed by returning cutting the wheel. The purpose of the current investigation is to determine whether there is a reason to claim that the cause of wheel surface crumbling could be a chemical composition of the wheel or wheel‐to‐rail hardness ratio. The carried out investigations have revealed that there is no reason to claim that the cause of wheel surface crumbling could be the chemical composition of the wheel or wheel‐to‐rail hardness ratio.

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