scholarly journals CONTROL LING THE DEPTH OF HARDENED LAYER, U10 STEEL PHASE COMPOSITION AND STRUCTUREТ IN THE COURSE OF PLASMA HARDENING

2015 ◽  
Author(s):  
Ant.A. Berdnikov ◽  
M.A. Filippov ◽  
A.A. Berdnikov ◽  
G.V. Alisova ◽  
D.V. Beznoskov
Keyword(s):  
Phase Composition ◽  
Hardened Layer ◽  
Plasma Hardening

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.

scholarly journals Перспективы развития процессов химико-термического упрочнения легированных сталей (обзорная информация)

2021 ◽  
Vol 70 (2) ◽  
pp. 78-85
Author(s):  
А.П. Прохоров ◽  
А.А. Баранова
Keyword(s):  
Phase Composition ◽  
Glow Discharge ◽  
Hardened Layer ◽  
Nitriding Process ◽  
Ion Nitriding ◽  
Steel Type ◽  
Structure Phase ◽  
Modified Layer

The paper summarizes the results of studies of the structure, phase composition and operational properties of gears made of steel type 38Kh2MYuA, which are observed in the modified layer, after the nitriding process. Much attention is paid to the process of ion nitriding in a glow discharge. The study of the hardened layer showed that there are some differences depending on the temperature of the process. Frequently used methods for the protection of non-aerated surfaces are considered.

Nanocrystalline grains and phase composition in the plasma hardening of cast-iron rollers

2008 ◽  
Vol 38 (8) ◽  
pp. 603-607 ◽  
Author(s):  
O. Yu. Efimov ◽  
Yu. F. Ivanov ◽  
V. E. Gromov ◽  
S. V. Konovalov
Keyword(s):  
Phase Composition ◽  
Cast Iron ◽  
Plasma Hardening

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.

The technology of thermal cyclic electrolytic plasma hardening of steels

2021 ◽  
Vol 101 (1) ◽  
pp. 26-34
Author(s):  
B.K. Rakhadilov ◽  
◽  
R.S. Kozhanova ◽  
Yu.N. Tyurin ◽  
L.G. Zhurerova ◽  
...  
Keyword(s):  
Hardened Layer ◽  
Medium Carbon Steel ◽  
Maximum Hardness ◽  
Industrial Installation ◽  
Medium Carbon ◽  
Plasma Hardening ◽  
Wide Range ◽  
Product Surface ◽  
Hardening Of Materials ◽  
Electrophysical Parameters

This work describes the technology of thermal cyclic electrolytic plasma hardening, as well as describes the design features of the electrolytic plasma heater. There are presented the results of the research of medium-carbon steel hardness treated by thermal cyclic electrolytic plasma hardening under different conditions. An industrial installation for thermal cyclic electrolytic plasma hardening of materials was developed to carry out thermal cyclic electrolytic plasma hardening of steels in an automated mode. Tempered layers were obtained on the surface of the samples with average thickness values from 0.5 to 10 mm and hardness up to 750 HV. Experimentally that the alternation of switching on the electric potential at a voltage of U1 = 320 V and U2 = 200 V provides heating of the product surface to a depth of 10 mm. In this case, the maximum hardness of the surface layer (750 HV) practically does not depend on the thickness of the hardened layer. The hardness of the hardened layer of the product gradually decreases from the maximum (750 HV) to the hardness of the base (280-300 HV). The developed installation allows to vary the electrophysical parameters within a wide range: to set the voltage, the duration of processing, the time of switching on and off the voltage.

scholarly journals Technological possibilities of plasma hardening

2018 ◽  
Vol 245 ◽  
pp. 04005
Author(s):  
Mikhail Korotkikh ◽  
Ludmila Ushomirskaya ◽  
Vyacheslav Shestakov ◽  
Dmitriy Ivanov
Keyword(s):  
Experimental Data ◽  
Surface Hardening ◽  
Plasma Heating ◽  
Hardened Layer ◽  
Plasma Hardening

The article shows the advantages of plasma hardening in comparison with other methods of surface hardening of steel products. Appropriate schemes of hardening of various products are considered and experimental data characterizing the possibility of obtaining a hardened layer of various thickness during the realization of various methods of plasma heating are presented.

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