APPLYING SURFACE PLASMA HARDENING FOR IMPROVING THE TRIBOLOGICAL CHARACTERISTICS OF STEEL PARTS

Tribologia ◽  
2019 ◽  
Vol 283 (1) ◽  
pp. 49-55 ◽  
Author(s):  
Bauyrzhan RAHADILOV ◽  
Laila ZHUREROVA ◽  
Zhuldyz SAGDOLDINA
Keyword(s):  
Wear Resistance ◽  
Experimental Studies ◽  
High Hardness ◽  
Hardened Layer ◽  
Heating Time ◽  
Tribological Characteristics ◽  
Surface Plasma ◽  
Initial State ◽  
Plasma Hardening ◽  
Fine Grained

This work presents the results of experimental studies on the application of surface plasma hardening to improve the tribological characteristics of steel marks of 40CrNi, 20Cr2Ni4A, and 34CrNi1Mn. According to the obtained results, it was established that, after plasma treatment, a modified layer with a thickness of 1–1.2 mm with high hardness and wear resistance is formed, consisting of a hardened layer of fine-grained martensite and, an intermediate layer of perlite and martensite. It was determined that, after treatment with a heating time of 3 min, the microhardness of steels 40CrNi and 20Cr2Ni4A doubles, and the steel 34CrNi1Mn increases 1.6 times, depending on the initial state, and the wear resistance of all steel samples increases, on average, 30 times.

Changes of Structural-Phase Condition in 18CrNi3MoA-SH Steel After Elektrolyte-Plasma Processing

2012 ◽  
Vol 601 ◽  
pp. 74-78 ◽  
Author(s):  
Mazhyn Skakov ◽  
Lyaila Bayatanova ◽  
Michael Sheffler
Keyword(s):  
Wear Resistance ◽  
Plasma Treatment ◽  
Structural Phase ◽  
Plasma Processing ◽  
High Wear Resistance ◽  
Initial State ◽  
Drilling Tool ◽  
Steel Microstructure ◽  
Fine Grained ◽  
Bainite Structure

The research shows the results of electrolyte-plasma treatment influence on structure-phase state, 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 represented. It was found out that 18CrNi3MoA-Sh steel microstructure has fine-grained martensite-bainite structure after the treatment. It was determined 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 on the average. Microhardness on the bearing lane surface after electrolyte-plasma processing is 7500 MPa on the average. Microhardness increases in 2-2.5 times more before treatment that indicates the technology efficiency.

scholarly journals ДОСЛІДЖЕННЯ ВПЛИВУ ПОКРИТТІВ І ТЕХНОЛОГІЧНИХ МЕТОДІВ ВИГОТОВЛЕННЯ НАПРЯМНИХ ЕЛЕМЕНТІВ НА ЇХ ЗНОСОСТІЙКІСТЬ

2021 ◽  
pp. 33-47
Author(s):  
Є. А. Фролов ◽  
Н. К. Резніченко ◽  
Є. С. Дерябкіна ◽  
С. І. Кравченко ◽  
В. В. Агарков ◽  
...  
Keyword(s):  
Wear Resistance ◽  
Surface Hardening ◽  
Experimental Studies ◽  
High Hardness ◽  
Carbide Powder ◽  
Test Duration ◽  
Test Results ◽  
Detonation Spraying ◽  
Surface Microrelief ◽  
Diamond Burnishing

The matter of the experimental studies of the effect of coatings and technological methods of manufacturing guide elements of universal prefabricated readjustable tooling on their wear resistance are presented. The coatings investigated were made of VK15 carbide powder, which were applied by detonation spraying, and a titanium nitride-based coating produced by condensation with ion bombardment, as well as the surface hardening of guide elements by diamond burnishing for various steels: 20V, 12KhN3A, 40Kh, 38KhMYuA-B and others.During the process of diamond smoothing the roughness improves by 2 - 3 classes and the very nature of the roughness changes: a surface microrelief is created with rounded peaks and valleys instead of microroughness with sharp peaks and valleys, which are characteristic of surfaces after grinding. In this case the bearing surface of the samples increases essentially, and their running-in is accelerated. According to the results of tests under a load of 50, 75 and 100 kgf, a graph of the dependence of wear on the specific pressure was built and it was found that the wear of samples after burnishing decreases by 25 ... 40% compared to polished and at a load of 20 kgf/cm, respectively, is for steel 20 ... 2.7 and 1.9 μm, for steel 12XN3A – 2.3 and 1.6 μm, for steel 40X – 1.8 and 1.3 μm and for steel 38XMYUA – 1.4 and 0.8 μm.With increasing the load the wear of the ground specimens increases sharply, and for the flattened specimens this process is much slower. Based on the test results, graphs of the wear rate were plotted depending on the test duration, as well as for wear in relation to the number of cycles. According to the test results, it was found that steel 38KhMYuA has less wear, which is associated with its high hardness and insignificant tendency to metal seizure. Based on the research results, it was found that different methods of processing parts (previous) grinding and diamond burnishing have different wear. It has been found that diamond burnishing is a very effective surface hardening process.As a result of the tests carried out, it was found that the best performance in testing for wear resistance obtained for a column with TiN coating, the thickness of which does not exceed 0.1 μm, is 5 - 6 times less than the wear resistance of columns with a hard-alloy coating. For the system of directly changeable dies, a pair is recommended, which includes a guide column with a detonation coating VK15 and a holder (sleeve) with a CIB coating based on TiN, since these coatings showed high performance properties and had practically no wear.

scholarly journals DEVELOPMENT OF WEAR- AND IMPACT-RESISTANT COATINGS BASED ON FE-TI-MN-C SYSTEM FOR OIL AND GAS EQUIPMENT

2018 ◽  
pp. 50-56
Author(s):  
P. M. Prysiazhniuk ◽  
L S. Shlapak ◽  
D. L. Lutsak ◽  
M. Y. Burda ◽  
A. O. Molchanov ◽  
...  
Keyword(s):  
Wear Resistance ◽  
Titanium Carbide ◽  
Abrasive Wear ◽  
Strain Hardening ◽  
Oil And Gas ◽  
Experimental Studies ◽  
Abrasive Wear Resistance ◽  
Manganese Steel ◽  
Initial State ◽  
Wear Resistant Coatings

The paper presents the results of research on the development of wear-resistant coatings on the working surfaces of equipment and tools operating in conditions of intense abrasive wear. Titanium carbide alloyed high-manganese steel with a high strain hardening capacity served as the basis for coatings. The coating was made by electric arc surfacing with powder electrodes, the charge of which consisted of ferrosilicomanganese, titanium powder, graphite, and components that protect the arc from the atmosphere. The coatings consiss of manganese austenite and dispersed inclusions of titanium carbide with dimensions of ~ 1 micron. Rockwell hardness was measured my means of TK-2 hardness testers (GOST 3882-74) by indentation of a diamond cone under a load of ~ 150 N (scale C). Before measuring the hardness, the surface deposited layer was deformed using the TS-2 hardness gage. At the same time, a carbide ball with a diameter of 10 mm manufactured according to GOST 3722-81 was used as an indenter. The indentation effort was 3,000 kg. Hardness was measured both in the well and in the undeformed zones. By the difference in hardness, the degree of work hardening was calculated. The developed coatings are characterized by the capacity for strain hardening under plastic deformation conditions. It was found that the hardness of the deformed coatings exceeds the hardness of the coatings in the initial state by 57% higher. Experimental studies of abrasive wear resistance under friction conditions on a fixed abrasive were carried out by comparing the developed coatings and serial materials for surfacing. The results of the comparison of abrasive wear resistance showed that the developed coatings are characterized by wear resistance higher compared to serial high-chromium alloys for surfacing almost 2 times. The wear resistance of coatings under conditions of aero-abrasive erosion was carried out using a Kleis centrifugal accelerator in an environment of quartz sand at angles of attack of 30 °, 60 ° and 90 °. The test results showed that the highest wear resistance of the developed coatings was determined at an angle of attack of 90 °. Analysis of the surface of the coatings carried out by electron microscopy showed no signs of brittle fracture. The developed coatings can be applied to increase the durability of the working surfaces of oil and gas equipment operating in abrasive conditions.

scholarly journals IMPROVING THE SURFACE STRUCTURE OF MASSIVE PARTS BY THE PLASMA METHOD

2021 ◽  
Author(s):  
I.M Kossanova.Т.Кanayev,A А.U.Аkhmedyanov,I.P. Mazur,
Keyword(s):  
Structural Changes ◽  
Surface Plasma ◽  
High Temperature Region ◽  
Heating Rates ◽  
Plasma Hardening ◽  
Fine Grained ◽  
Kinetics Of ◽  
New Phase ◽  
Phase And Structural Changes ◽  
Structural Zones

An increase in the reliability of the operation of large-sized and massive parts by plasma hardening of their surfaces is substantiated. It has been established that the formation of several structural zones of different microhardness is observed in detail along the depth of hardening, indicating the formation of a gradient-layered structure. It has been proved that at ultrafast heating rates, which occur during surface plasma hardening, phase and structural changes move to the high temperature region, changing the kinetics of the appearance and growth of new phase nuclei. In this case, fine-grained austenite is formed, which is transformed into a highly dispersed martensitic structure, which increases the strength and reliability of the surfaces of the parts.

Influence of Regimes Electrolytic Plasma Cementation on the Mechanical Properties of Steel 12Cr18Ni10Ti

2012 ◽  
Vol 531-532 ◽  
pp. 173-177 ◽  
Author(s):  
Mazhyn Skakov ◽  
Sherzod Kurbanbekov ◽  
Michail Scheffler
Keyword(s):  
Mechanical Properties ◽  
Structural Phase ◽  
Plasma Processing ◽  
Implementation Process ◽  
High Hardness ◽  
Hardened Layer ◽  
Operational Parameters ◽  
Surface Layers ◽  
Fine Grained ◽  
Phase Condition

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 µm 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.

Study of plasma-hardened wheel steel using nanoindentation

2020 ◽  
Vol 86 (4) ◽  
pp. 56-60
Author(s):  
A. T. Kanaev ◽  
Z. M. Ramazanova ◽  
S. K. Biizhanov
Keyword(s):  
Mechanical Properties ◽  
Wear Resistance ◽  
Surface Layer ◽  
Young’S Modulus ◽  
Young's Modulus ◽  
Elastic Recovery ◽  
Physical And Mechanical Properties ◽  
Hardened Layer ◽  
Wheel Steel ◽  
Plasma Hardening

The necessity and possibility of using nanoindentation in studying the physical and mechanical properties of plasma-hardened wheel steel are considered. The goal of the study is demonstration and substantiation of significant differences in the mechanical properties and behavior of the materials in nanoscale tests from those determined in traditional macroscopic tests. The method was implemented using a NanoHardnessTecter nanohardness tester. The electric field formed in the nanoscale hardness tester pressed on the indenter and the diamond tip of the indenter is immersed in the surface layer of the material under study. The characteristics of the surface layer are determined using the developed software. Knowledge of the physicomechanical characteristics of the material (hardness, Young’s modulus, elastic recovery, etc.) which affect the wear resistance of the surface layers, allows one to evaluate and select the optimal surface modification technology using plasma hardening. The credibility of determination depends on the parameters of measuring equipment and compliance with the requirements to the depth of the imprint depending on the thickness of the hardened layer. The studies were carried out on the samples cut from the rim and crest of a railway wheel subjected to surface plasma hardening on a UPNN-170 installation (Russia). It is shown that the hardness (according to Vickers HV and H) of the rim is greater, and Young’s modulus, on the contrary, is less than the corresponding characteristics of the crest. Moreover, the wear resistance of hardened structural steel increases after nanostructural friction treatment.

REYNOLDS 390 and A390

Alloy Digest ◽  
1971 ◽  
Vol 20 (8) ◽  
Keyword(s):  
Mechanical Properties ◽  
Wear Resistance ◽  
Corrosion Resistance ◽  
High Temperature ◽  
Physical Properties ◽  
High Hardness ◽  
Heat Treating ◽  
Silicon Alloys ◽  
Aluminum Silicon Alloys ◽  
Temperature Performance

Abstract REYNOLDS 390 and A390 are hypereutectic aluminum-silicon alloys having excellent wear resistance coupled with good mechanical properties, high hardness, and low coefficients of expansion. This datasheet provides information on composition, physical properties, hardness, elasticity, and tensile properties as well as fatigue. It also includes information on high temperature performance and corrosion resistance as well as casting, heat treating, and machining. Filing Code: Al-203. Producer or source: Reynolds Metals Company.

HOWMET No. 3

Alloy Digest ◽  
1968 ◽  
Vol 17 (10) ◽  
Keyword(s):  
Fracture Toughness ◽  
Wear Resistance ◽  
Corrosion Resistance ◽  
Base Alloy ◽  
High Hardness ◽  
Heat Treating ◽  
High Heat ◽  
Cobalt Base Alloy ◽  
Metal Products ◽  
Cobalt Base

Abstract HOWMET No. 3 is a cobalt-base alloy having high hardness and compressive strength, high heat and corrosion resistance, along with excellent abrasion and wear resistance. It is recommended for bushings, scrapers, valve parts, and other machinery components. This datasheet provides information on composition, physical properties, hardness, elasticity, and tensile properties as well as fracture toughness. It also includes information on corrosion resistance as well as casting, heat treating, machining, and joining. Filing Code: Co-56. Producer or source: Howmet Corporation Metal Products Division.

DOUBLE SEVEN

Alloy Digest ◽  
1962 ◽  
Vol 11 (9) ◽  
Keyword(s):  
Fracture Toughness ◽  
Wear Resistance ◽  
Physical Properties ◽  
Cold Working ◽  
High Hardness ◽  
Heat Treating ◽  
Heavy Duty ◽  
High Carbon ◽  
Die Steel ◽  
High Chromium

Abstract DOUBLE SEVEN is an air hardening high-carbon high-chromium tool and die steel having high hardness and wear resistance. It is recommended for shear blades, cold working tools, and heavy duty dies. This datasheet provides information on composition, physical properties, hardness, and elasticity as well as fracture toughness. It also includes information on forming, heat treating, machining, and joining. Filing Code: TS-124. Producer or source: Edgar Allen & Company Ltd, Imperial Steel Works.

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