Changes in the operational properties of steel 40x during modification of the surface layer with organosilicate antifriction composites and tribological tests

2015 ◽  
Author(s):  
L. B. Leontev ◽  
N. P. Shapkin ◽  
A. L. Leontev
Keyword(s):  
Surface Layer ◽  
Tribological Tests ◽  
Antifriction Composites ◽  
Modification Of The Surface

scholarly journals THE INFLUENCE OF THE SOAKING TEMPERATURE OF NITRIDED WCL TOOL STEEL (EN-X37CrMoV5-1) ON THE MICROHARDNESS AND TRIBOLOGICAL WEAR OF THE SURFACE LAYER

Tribologia ◽  
2016 ◽  
Vol 268 (4) ◽  
pp. 69-78
Author(s):  
Michał DWORAK ◽  
Adrian BARYLSKI ◽  
Krzysztof ANIOŁEK ◽  
Elizaveta STEPANOVA
Keyword(s):  
Surface Layer ◽  
High Temperature ◽  
Low Temperature ◽  
Tool Steel ◽  
Nitrided Layer ◽  
Industrial Furnace ◽  
Tribological Tests ◽  
Nitrided Steel ◽  
Hot Work Tool Steel ◽  
Soaking Temperature

The present paper refers to the evaluation of the influence of soaking temperature of nitrided hot work tool steel, X37CrMoV5-1 (WCL), intended for dies for extruding aluminium profiles, on the structure, microhardness, and tribological wear of the nitrided layer. The research involved nitrided steel specimens (X37CrMoV5-1) soaked for 8 hours in an industrial furnace at temperatures of 450°C, 480°C, 520°C, 560°C, and 600°C. For comparison purposes, a REFERENCES material was used, which was not soaked after nitriding. Initially, as the soaking temperature raised, the microhardness of the nitrided layer increased by ca. 10%; however, a further increase in the soaking temperature to more than 450°C caused a decrease in the microhardness of the nitrided layer. The results of tribological tests showed that soaking nitrided steel at a low temperature (450°C) and high temperature (600°C) caused a decrease in tribological wear. Out of the tested materials, the highest microhardness of the upper layer was observed in the samples soaked at 450°C, while the highest resistance to tribological wear was obtained for the samples soaked at 600°C. The conducted tests indicate the possibility of extending the lifetime of dies made from the investigated nitrided steel.

scholarly journals The analysis of friction properties after laser texturizing of the silicon carbide surface layer

2018 ◽  
Vol 183 ◽  
pp. 02010
Author(s):  
Norbert Radek ◽  
Agnieszka Szczotok ◽  
Renata Dwornicka
Keyword(s):  
Silicon Carbide ◽  
Surface Layer ◽  
Statistical Analysis ◽  
Design Of Experiments ◽  
Laser Beam ◽  
High Reliability ◽  
Laser Beam Machining ◽  
Before And After ◽  
High Roughness ◽  
Modification Of The Surface

The modification of the surface properties is a desired technological procedure. One of the possible method is the electro-spark deposition (ESD). Unfortunately, ESD process produces a surface with high roughness. The laser beam machining (LBM) has been involved to lower roughness of the coating made by ESD. The elements coated by ESD have been tested to determine tribological properties and they were compared before and after LBM. To achieve high reliability of the results, the test has been conducted in accordance with design of experiments methodology and the results which were obtained have been processed by a statistical analysis. The description of such an experiment performed for a silicon carbide SiC coating, the obtained results and the conclusions are included in this paper.

The Methods of Surface Preparations of Titanium Alloys Applicable for Friction Pairs in Endoprostheses

2016 ◽  
Vol 687 ◽  
pp. 111-116
Author(s):  
Marcin Nabrdalik ◽  
Michał Sobociński
Keyword(s):  
Surface Layer ◽  
Titanium Alloys ◽  
Hip Joint ◽  
Abrasion Resistance ◽  
Tin Coating ◽  
Tribological Tests ◽  
Total Knee ◽  
Bio Compatibility

The paper presents the results of tribological tests on titanium alloys subjected to modification of surface layer. The tests were conducted with metal biomaterials coated with TiN layer and anodized, applied in knee and hip joint endoprostheses. One of the ways of improving abrasion resistance of metal and polyethylene elements of endoprostheses is TiN coating by means of PVD method. It results in getting the metal of high bio-compatibility and more friction resistant. The research were carried out for various friction pairs applied in total knee and hip joint endoprostheses.

scholarly journals Application of surface frequency functions to assess the state of the kinematic pair elements

2018 ◽  
Vol 182 ◽  
pp. 02019
Author(s):  
Maciej Matuszewski ◽  
Małgorzata Słomion ◽  
Janusz Musiał ◽  
Andres Bustilo
Keyword(s):  
Surface Layer ◽  
Density Function ◽  
Power Density ◽  
Spectral Power ◽  
Spectral Power Density ◽  
The State ◽  
Surface Structures ◽  
Kinematic Pair ◽  
Tribological Tests ◽  
Frequency Functions

In this paper the possibility of using frequency functions of the kinematic pair surface layer elements was analyzed for evaluation of the surface layer condition. The function of spectral power density and autocorrelation which were accepted for analysis was characterized. Evaluation of the elements condition was made on the quantify way as changes in degree of isotropy and in the qualitative way based on the graphs of the analyzed frequency functions. After tribological tests the surface structures were adopted to assess the changes. Spectral graphs for structures without cooperation (directly after-machining) and for the different friction distance, were analyzed. Conditions during tribological tests were taken as permanent. The determined degree of isotropy basis on the frequency functions and received graphs of spectra power density function and autocorrelation become useful in evaluation of the surface layer changes during its transformation.

Ionizing Radiation Effect on PMMA Measured by Microhardness

2013 ◽  
Vol 586 ◽  
pp. 198-201 ◽  
Author(s):  
David Manas ◽  
Martin Ovsik ◽  
Miroslav Manas ◽  
Michal Stanek ◽  
Jakub Javorik ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Surface Layer ◽  
Cross Linking ◽  
Case Hardening ◽  
Microhardness Test ◽  
Irradiation Dosage ◽  
The Subject ◽  
Metal Materials ◽  
Injection Technology ◽  
Modification Of The Surface

The experimental study deals with the effect of modification of the surface layer by irradiation cross-linking on the mechanical properties of the Poly (methyl methacrylate) - PMMA tested using the instrumented microhardness test. The surface layer of PMMA specimen made by injection technology was modified by irradiation cross-linking using beta irradiation, which significantly influences mechanical properties of the surface layer. Compared to the heat and chemical-heat treatment of metal materials (e.g. hardening, nitridation, case hardening), cross-linking in polymers affects the surfaces in micro layers. These mechanical changes of the surface layer are observed in the instrumented microhardness test. Our research confirms the comparable properties of surface layer of irradiated PMMA with highly efficient polymers. The subject of this research is the influence of irradiation dosage on the changes of mechanical properties of PMMA.

scholarly journals Modification of the surface layer of the system coating (TiCuN)/substrate (A7) by an intensive electron beam

2015 ◽  
Vol 81 ◽  
pp. 012009 ◽  
Author(s):  
Yu F Ivanov ◽  
A I Potekaev ◽  
E A Petrikova ◽  
O V Ivanova ◽  
I A Ikonnikova ◽  
...  
Keyword(s):  
Surface Layer ◽  
Electron Beam ◽  
Modification Of The Surface

scholarly journals Assessment of friction pair elements condition based on changes in the geometric surface structure isotropicity degree

2019 ◽  
Vol 302 ◽  
pp. 01015 ◽  
Author(s):  
Maciej Matuszewski ◽  
Małgorzata Słomion ◽  
Adam Mazurkiewicz ◽  
Danil Yu. Pimenov
Keyword(s):  
Weight Loss ◽  
Surface Layer ◽  
Surface Structure ◽  
Friction Pair ◽  
Tribological Characteristics ◽  
Roughness Parameters ◽  
Functional Characteristics ◽  
Tribological Tests ◽  
Functional Features ◽  
Geometric Surface

This paper regards the possibility of using the degree of the surface isotropicity to assess the condition of the surface layer friction pair elements. The analysis is based on certain changes in operational and technological surface layer. The methods of constituting the surface layer have been characterized due to the features of geometric surface structure as well as the problem of assessing the condition of surface in terms of functional features and tribological characteristics. The evaluation of the occurring changes in the surface layer have been conducted by performing tribological tests and for descript condition of surfaces the degree of surface isotropicity and weight loss of specimens have been adopted. Whereas the assessment of technological state of the surface layer has been carried out for the surface after its coating. Based on the analysis, it has been found that the use for assessment the condition of surface layer and the degree of the surface isotropicity are useful and it is an alternative way or supplement to classical adoption of a properly selected set of roughness parameters to evaluate the potential functional characteristics of friction couples surfaces.

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