Morphological Changes in the Dislocation Structure of Structural Steel 20GL after Electrolytic-Plasma Hardening of the Surface

Rahadilov, Bauyrzhan; Zhurerova, Laila; Sagdoldina, Zhuldyz; Kengesbekov, Aidar; Bayatanova, Lyaila

doi:10.1134/s1027451021020300

Cited by 6 publications

(3 citation statements)

References 5 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The application of the electrolytic plasma surface quenching process resulted in a finer microstructure and an increase in hardness due to high heating and cooling rates. Similar results were shown in [16,17], where there was a significant increase in the hardness and wear resistance of tools and highly loaded parts after electrolytic plasma quenching. Aysun Ayday et al [18] studied the effect of the electrolytic plasma surface hardening on the microstructure and hardness of AISI 1040 steel.…”

Section: Introductionsupporting

confidence: 85%

Investigation of Changes in the Structural-Phase State and the Efficiency of Hardening of 30CrMnSiA Steel by the Method of Electrolytic Plasma Thermocyclic Surface Treatment

et al. 2022

View full text Add to dashboard Cite

Electrolytic plasma thermocyclic surface hardening is an attractive solution for both chemical and heat treatment used to improve the properties of the steel surface by structural and phase transformation. Structural and phase transformations occurring during the process of electrolytic plasma thermocyclic hardening are performed repeatedly at varying heating–cooling temperatures, which radically improve the quality of the part and give them properties unattainable by means of one-time processing. The impact of electrolytic plasma thermocyclic hardening modes on the structure and mechanical and tribological properties of 30CrMnSiA steel is investigated. The structural and phase components were examined using optical and scanning electron microscopy, as well as X-ray phase analysis. It is established that the structure of the cross-section is characterized by the following zonality: zone 1—a near-surface hardened zone, which is composed of hardened martensite; zone 2—thermal influence; and zone 3—a matrix consisting of pearlite and ferrite. The microhardness and wear resistance of the hardened surface were evaluated by nanoindentation and “ball on disk” methods, respectively. Nanoindentation analysis demonstrated that the indentation hardening process provides a maximum increase in hardness by three times and an increase in stiffness with a decrease in the elastic modulus by 38% compared to the original steel. The results of tribological studies show that electrolytic plasma thermocyclic hardening increases the resistance of steel to friction by increasing the surface hardness and reduces the area of actual contact during friction. It is established that the microhardness of the cross-section decreases proportionally from the surface to the depth of the layer, which is associated with a decrease in the volume content of martensite.

show abstract

Section: Introductionsupporting

confidence: 85%

Investigation of Changes in the Structural-Phase State and the Efficiency of Hardening of 30CrMnSiA Steel by the Method of Electrolytic Plasma Thermocyclic Surface Treatment

et al. 2022

View full text Add to dashboard Cite

show abstract

“…Electron backscattering (BSE) and element-distribution methods by X-ray energy dispersive spectroscopy (EDS), attached to the Tescan Mira 3 LMU scanning electron microscope (SEM), were used to obtain a transverse contrast image for the distribution of elements, respectively. Sliding wear resistance was evaluated by tribometer TRB 3 (Anton Paar Srl, Peseux, Switzerland) using a standard-procedure "ball-disk" (international standards ASTM G 133-95 and ASTM G99), whereas counter-body, they used a ball-disk with a diameter of 6.0 mm, SiC coated steel, a load of 6 N, a linear speed 15 cm/s, a radius of curvature 5 mm, and a friction path 100 m [22]. The surface roughness of the titanium-based coatings (Ra) was estimated by means of the profilometer model 130 (JSC "Plant Proton", Moscow, Russia).…”

Section: Spraying Methods and Characteristicsmentioning

confidence: 99%

Synthesis and Formation Mechanism of Metal Oxide Compounds

et al. 2022

View full text Add to dashboard Cite

In this work, the influence of the technological parameters of the detonation method on the formation of metal oxide compounds on the basis of titanium was investigated. The aim of the work was to investigate the method of the effective control of the phase composition and microstructure of titanium-based coatings during detonation spraying. The main parameters that varied in detonation spraying were the volume of filling the detonation barrel with explosive mixture and the oxygen/fuel ratio. The mechanism of formation of the gradient structure of coatings based on metal oxide compounds depending on the technological parameters of detonation spraying was considered. The structural-phase states and tribological properties of detonation coatings were investigated by the following methods: X-ray phase analysis (XRD), scanning electron microscopy (SEM), energy dispersive spectroscopy (EDX-mapping), profilometry, and the test for wear-resistance according to the “ball-disk” scheme. It is shown that the phase composition of coatings may significantly change relative to the initial titanium powder during the detonation spraying due to the interaction of particles of powders with components of the gas atmosphere. Varying the spraying parameters may control the chemical reaction and provide conditions for the synthesis of the desired phases in the coatings (titanium oxide TiO2 and Ti2O3).

show abstract

“…Titanium nitride (TiN) has excellent wear resistance, erosion resistance, heat resistance and low friction coefficient [1][2][3][4][5], so it is widely used in some areas as hard, wear-resistant coatings. The choice of TiN coating deposition methods is determined by geometric parameters of coated parts and articles, their design and technological features, conditions of future operation, as well as the required thickness of the functional protective layer [6][7][8][9][10]. The most common methods for obtaining TiN coatings are CVD and PVD methods.…”

Section: Introductionmentioning

confidence: 99%

Improving the Efficiency of Air Plasma Spraying of Titanium Nitride Powder

et al. 2022

View full text Add to dashboard Cite

The operation modes of a plasmatron for powder coating spraying have been studied. The plasmatron has a node of annular input and a gasdynamic focusing of the powder, and the outlet holes of the nozzle-anode are made in the form of rectangular narrowing-expanding channels (No.34334 RK: IPC H05H 1/42). The dynamics and trajectories of the powder particles in the plasmatron were investigated. The paper analyzes the influence of plasmatron arc current and working gas flow rate on the structure and properties of the obtained coatings. It is established that the phase composition of the sprayed coatings and the initial powder is the same: the main phase is the compound TiN, in addition, the structure contains the phase TiO2. The results of tribological tests of the coatings under dry friction conditions according to the ball-on-disk scheme are presented. Within the framework of this study, it can be said, from the point of view of obtaining denser coatings with high performance characteristics, that the optimal modes of plasma spraying of TiN powder are a current of 250 A and the working gas flow rate of argon 34 L/min.

show abstract

Morphological Changes in the Dislocation Structure of Structural Steel 20GL after Electrolytic-Plasma Hardening of the Surface

Cited by 6 publications

References 5 publications

Investigation of Changes in the Structural-Phase State and the Efficiency of Hardening of 30CrMnSiA Steel by the Method of Electrolytic Plasma Thermocyclic Surface Treatment

Investigation of Changes in the Structural-Phase State and the Efficiency of Hardening of 30CrMnSiA Steel by the Method of Electrolytic Plasma Thermocyclic Surface Treatment

Synthesis and Formation Mechanism of Metal Oxide Compounds

Improving the Efficiency of Air Plasma Spraying of Titanium Nitride Powder

Contact Info

Product

Resources

About