Intensified Saturation of Iron with Nitrogen by the Method of Thermogasocyclic Nitriding

Belashova, I. S.; Петрова, Л. Г.; Sergeeva, A. S.

doi:10.1134/s1995421218010045

Cited by 5 publications

(3 citation statements)

References 10 publications

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“…Активизации происходящих процессов при ХТО способствует воздействие как тепловой, так и других видов энергии: лазерного излучения [4], плазмы [5], ультразвука [6]. Интенсификация процесса азотирования может быть достигнута регулированием активности атмосферы, изменением ее состава, использованием ступенчатых и газоциклических процессов [7], формированием каталитических и барьерных поверхностных пленок [8].…”

Section: наукоёмкие технологии электро-физикохимической и комбинироваunclassified

Electric discharge as technological factor of intensification of chemical-thermal treatment of engineering products

Петрова

Alexandrov

Sergeeva

2019

Science Intensive Technologies in Mechanical Engineering

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The advantages of nitriding in an electrostatic and high-frequency field connected with the possibility of carrying out processes at normal pressure are shown. The acceleration of the process of diffusion saturation with nitrogen in an electric field with the formation of a spark discharge as compared with gas nitriding is confirmed experimentally. This method of steel nitriding allows forming layers of different structure and thickness with the specified gradient of hardness.

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Section: наукоёмкие технологии электро-физикохимической и комбинироваunclassified

Electric discharge as technological factor of intensification of chemical-thermal treatment of engineering products

Петрова

Alexandrov

Sergeeva

2019

Science Intensive Technologies in Mechanical Engineering

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“…3 By thermogas cycling, as Belashova et al (2018) showed. Nam et al (2019) and Maldzinski (2007) have established that regardless of the processing variant adopted, a rigorous control of the nitriding process is necessary (the final stage of thermochemical processing), so a control of the correlation between its thermal, temporary, chemical and gasodynamic parameters specific to it, strictly dependent on the purpose pursued.…”

Section: Introductionmentioning

confidence: 96%

Nitriding in ammonia-nitrogen gaseous mixtures, after the simultaneous saturation with Ti and Al

Cotruț¹,

Ghinea²,

Brânzei³

et al. 2022

IJSURFSE

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The paper addresses aspects of nitriding in ammonia-nitrogen gaseous mixtures, after simultaneous saturation with Ti and Al using solid powdery media. The effects quantification of the nitriding conditions variation, i.e., temperature, the ammonia dissociation degree and dilution degree with nitrogen, on the layer's growth kinetics, simultaneous saturated with Ti and Al and subsequently nitrided, in the case of two metallic materials, Fe-ARMCO and 34CrAlMo5 steel, could be ensured using the second-order non-compositional experimental programming method. It was concluded that, in the case of ammonia dilution with nitrogen, the variation of the ammonia dissociation degree in the range 20÷70%, in the context of simultaneous dilution of ammonia with nitrogen, statistically significantly influences the layers growth kinetics with increasing nitriding temperature. On the other hand, for a dilution degree of ammonia with about 30% nitrogen and an ammonia dissociation degree of about 45%, the most intense layers growth kinetics was highlighted if the nitrided layer has been previously saturated simultaneously with Ti and Al.

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“…In general, research on the effect of pressure variation below and above atmospheric pressure (respectively, vacuum, or high pressure nitriding) indicates an intensification of the growth kinetics of nitrided layers [ 20 , 21 ]. Along with these variants of intensifying the growth kinetics of nitrided layers, the use of laser radiation [ 22 , 23 ] at low pressures [ 20 , 21 ] in the presence of rare earths [ 24 ] and thermogas cycling [ 25 ] represent other variants of particularly efficient processing.…”

Section: Introductionmentioning

confidence: 99%

The Effects of Modifying the Activity of Nitriding Media by Diluting Ammonia with Nitrogen

et al. 2021

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This paper discusses the issue of the effects of modifying the activity of nitriding media by diluting ammonia with nitrogen and the concomitant variation in the degree of ammonia dissociation on the layer’s growth kinetics and their phase composition. To understand and quantify the effects of the variation in the main parameters that influence the layer growth kinetics, the experimental programming method was used and mathematical models of interactions between influence and kinetics parameters were obtained for two metallic materials: Fe-ARMCO and 34CrAlMo5 nitralloy steel. It was concluded that the nitriding operating temperature and the degree of nitrogen dilution of the ammonia have statistically significant influences on the kinetics of the nitrided layer. In the same context, it was analytically proved and experimentally confirmed that the ammonia degree dissociation from the gaseous ammonia-nitrogen mixture, along with the dilution degree of the medium with nitrogen, significantly influences the nitrogen potential of the gaseous mixture used for nitriding and thus the concentration of nitrogen in balance at the medium thermochemically processed metal product interface.

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Intensified Saturation of Iron with Nitrogen by the Method of Thermogasocyclic Nitriding

Cited by 5 publications

References 10 publications

Electric discharge as technological factor of intensification of chemical-thermal treatment of engineering products

Electric discharge as technological factor of intensification of chemical-thermal treatment of engineering products

Nitriding in ammonia-nitrogen gaseous mixtures, after the simultaneous saturation with Ti and Al

The Effects of Modifying the Activity of Nitriding Media by Diluting Ammonia with Nitrogen

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