Strength and Plasticity of the Surface Layers of Metals Nitrided in Glow Discharge

Stechyshyn, M. S.; Stechyshyna, N. M.; Martynyuk, А. V.; Luk’yanyuk, M. M.

doi:10.1007/s11003-018-0156-5

Cited by 8 publications

(2 citation statements)

References 5 publications

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“…The layer without a nitride zone has the highest plasticity [9,10]. In general, the thinner the nitride zone, the more plastic the nitrided layer, but the lower its resistance to abrasive and corrosion-mechanical wear.…”

Section: Research Results and Their Discussionmentioning

confidence: 99%

Influence of the parameters of hydrogen nitrogen nitrogen in a glow discharge on tribological and physico-chemical properties of steel 40X

Stechishina¹,

Стечишин²,

Martynyuk³

et al. 2021

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One of the modern and effective methods of hardening metals is nitriding in a glow discharge in ammonia or in an anhydrous medium (nitrogen + argon) - BATR. This paper presents the results of experimental studies comparing the results of tribological and physicochemical properties of hardened surfaces obtained by nitriding with autonomous and interconnected BATR modes. The complex of traditionally fixed values of operating parameters (temperature, composition of the gas mixture, pressure and saturation time) without taking into account energy characteristics (voltage, current density and specific discharge power) significantly reduces the technological capabilities of BATR to achieve the necessary physicochemical properties of metal surfaces specified by conditions exploitation. Taking into account the energy characteristics of BATR, a significant reduction in the energy consumption of the nitriding process is achieved. The energy levels of the main subprocesses are significantly different: the formation of nitrides occurs at low energies, surface sputtering occurs at high voltage values, and nitrogen diffusion occurs at increased current density values. In cases where the energy of the flow is insufficient, either a glow discharge may not occur at all, or with a lack of voltage, the nitride ball on the surface is not sprayed and it acts as a barrier that prevents the diffusion process into the inner layers of the metal, which leads to low physicochemical and, correspondingly, tribological indicators of nitrided balls. The quantitative ratio between them and the required operational properties of the metal, respectively, can be achieved only through an independent combination of the energy and operating characteristics of BATR

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Section: Research Results and Their Discussionmentioning

confidence: 99%

Influence of the parameters of hydrogen nitrogen nitrogen in a glow discharge on tribological and physico-chemical properties of steel 40X

Stechishina¹,

Стечишин²,

Martynyuk³

et al. 2021

View full text Add to dashboard Cite

show abstract

“…Obviously, while ensuring the independence of the BATR energy parameters, additional opportunities are opened both for the intensification of the process and for controlling the processes of formation of the required physicochemical characteristics of the nitrided layers, which correspond to the operating conditions of the parts of machines and apparatus. In this case suppression or, on the contrary, intensification of certain subprocesses and formation of different structures of the modified layer is possible [10].…”

Section: Results Of the Experiments And The Discussionmentioning

confidence: 99%

Fuel of the keeping needs of the energy discharge during nitrogen on the tribological characteristics of the design steel 45

Stechyshyna

Stechyshyn

Martyniuk

2019

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The effect of power discharge category W in BATR on tribological characteristics of nitrous steel 45 is investigated in the work. The highest wear resistance of steel 45 corresponds to mode 7, which provides optimum physico-chemical characteristics of the nitrided layer. The ratio of the intensities of the passage of the main BATR subprocesses determines the structure and phase composition of the nitrided layers. Depending on the current combination of parameters of the mode of formation of the nitrided layer, the intensity of the flow of the above subprocesses (nitride formation, sputtering and diffusion saturation of the surface with nitrogen), and therefore the intensity of the formation of certain phases may be different, and sometimes reverse. For example, as the energy of the incident stream W increases, the pre-formed nitride layer is sprayed, which stimulates the process of nitrogen diffusion into the metal base and the formation of e and g - phases. When the flow energy is insufficient to atomize the nitride layer, it acts as a kind of barrier that impedes or completely stops the process of nitrogen diffusion. It is established that the decrease in the specific discharge power leads to a decrease in the thickness of the nitride and diffusion zones and, as a consequence, the tribological characteristics deteriorate. It is revealed that at the maximum values of energy parameters, a nitrous containing layer is formed e , g і a - phase. The decrease in voltage and current density causes the particle to increase g - pfase (Fe4N) and according to the reduction of the share e - phase (Fe2N). At minimum values of energy parameters of formation of nitrides on the surface is absent and the nitrided layer consists only of a - phase.

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Physicochemical Properties of Carbonitrided KhVG Steel

et al. 2021

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Strength and Plasticity of the Surface Layers of Metals Nitrided in Glow Discharge

Cited by 8 publications

References 5 publications

Influence of the parameters of hydrogen nitrogen nitrogen in a glow discharge on tribological and physico-chemical properties of steel 40X

Influence of the parameters of hydrogen nitrogen nitrogen in a glow discharge on tribological and physico-chemical properties of steel 40X

Fuel of the keeping needs of the energy discharge during nitrogen on the tribological characteristics of the design steel 45

Physicochemical Properties of Carbonitrided KhVG Steel

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