Effect of Nitriding Current Density on the Surface Properties and Crystallite Size of Pulsed Plasma-Nitrided AISI 316L

Díaz-Guillén, J.C.; Granda‐Gutiérrez, E. E.; Vargas‐Gutiérrez, G.; Díaz-Guillén, M.R.

doi:10.4236/msce.2015.31007

Cited by 10 publications

(9 citation statements)

References 21 publications

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“…Thus, the results of studies of the average energy of ions with voltage and pressure do not allow them to be considered as the basis for establishing the regularities due to the absence of the composition of the gas mixture, as well as the way of changing the voltage, subject to constant values of temperature and pressure. The same applies to the results reported in [8,9], where the effect of current density on the thickness of the nitrided layer was investigated. According to [9], increasing the current density leads to an increase in the thickness of the nitrided layer, and according to [8] -to its decrease.…”

Section: Results Of the Experiments And The Discussionmentioning

confidence: 62%

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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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Section: Results Of the Experiments And The Discussionmentioning

confidence: 62%

“…The same applies to the results reported in [8,9], where the effect of current density on the thickness of the nitrided layer was investigated. According to [9], increasing the current density leads to an increase in the thickness of the nitrided layer, and according to [8] -to its decrease.…”

Section: Results Of the Experiments And The Discussionmentioning

confidence: 62%

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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“…In particular, low-temperature plasma nitriding (<420°C) of austenitic stainless steels such as AISI 304 or 316L results in formation of a metastable austenite phase supersaturated with nitrogen atoms (nitrogen concentration is [20][21][22][23][24][25][26][27][28][29][30] ) and exhibits significant improvement in substrate hardness while the wear resistance is enhanced by several orders of magnitude (Menthe et al, 2000). What is more, some authors attribute γN excellent anticorrosive properties (Fossati et al, 2006b).…”

Section: General Informationmentioning

confidence: 99%

Direct Current and Pulsed Direct Current Plasma Nitriding of Ferrous Materials a Critical Review

Łępicka

Grądzka-Dahlke

2016

Acta Mechanica Et Automatica

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Nowadays, the improvement of ferrous materials performance is a problem of high interest. One of well-known wear-and corrosion properties improving technique is plasma nitriding, in which elemental nitrogen is introduced to the surface of a metal part for subsequent diffusion into the material. As a result, a compound, "white" layer and a diffusion zone are formed at the detail's surface. Most of the authors positively describe the effects of surface ion nitiding. On the other hand, there are also reports on adverse effects of direct current and pulsed direct current plasma nitriding on ferrous materials performance. Therefore, an attempt to provide comprehensive summary on direct current and pulsed direct current ion nitriding and its influence on ferrous materials' mechanical and corrosion properties has been made. According to the results, some of the technique drawbacks are hard to avoid in mass production.

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“…Ayrıca elde edilen yeni fazların da alaşımın sertlik değerini olumlu yönde etkilediği belirtilmiştir [26][27][28][29][30]. Bunlara ilave olarak üretilen malzemenin kristal boyutunun düşük olması malzemenin sertliğini artırdığı tespit edilmiştir [31]. Bir örnek olarak J. C. Díaz-Guillén ve arkadaşları üretmiş oldukları plazma-nitrürlü AISI 316L paslanmaz çelik numuneler sayesinde kristal boyutundaki düşüşün malzeme sertliğine etkisini araştırmıştır.…”

Section: Gi̇ri̇ş (Introduction)unclassified

“…Bir örnek olarak J. C. Díaz-Guillén ve arkadaşları üretmiş oldukları plazma-nitrürlü AISI 316L paslanmaz çelik numuneler sayesinde kristal boyutundaki düşüşün malzeme sertliğine etkisini araştırmıştır. Buna göre elde ettikleri malzemelerin sertlik değerlerinin kristal boyutunun düşmesiyle birlikte 262 HV'den 1245 HV'ye arttığını belirtmişlerdir [31].…”

Section: Gi̇ri̇ş (Introduction)unclassified

Mekaniksel Alaşımlama İle Üretilen Nanokristal Mg50Cu50 Tozları

Kursun¹

2017

SAÜ Fen Bilimleri Enstitüsü Dergisi

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Bu çalışmada Mg ve Cu ikili karışımı ile nanokristal Mg50Cu50 kompozisyonlu toz alaşımı mekanik alaşımlama tekniği ile sentezlenmiştir. Mekanik alaşımlama süresinin, toz alaşımın faz değişimine ve mikro sertliğine etkisi X-ışını kırınımı (XRD), taramalı elektron mikroskobu (SEM) ve Vickers mikro sertlik (HV) cihazı ile incelenmiştir. Alaşımın mikro sertlik değeri artan mekaniksel alaşımlama zamanı ile yükseldi ve final ürün için ~600 Mpa olarak ölçülmüştür. Mg50Cu50 alaşımının kristal boyutu XRD piklerinin genişlemesi ile Debye Scherrer eşitliği kullanılarak hesaplanmıştır. Toz alaşımın kristal boyutu ayrıca geçirimli elektron mikroskobu (TEM) ile teyit edildi ve yaklaşık 10 nm olarak belirlenmiştir. Mekanik olarak alaşımlanan Mg50Cu50 tozlarının termal özellikleri diferansiyel taramalı kalorimetri ile (DSC) analiz edilmiştir. DSC sonuçlarına göre ~ 650 ˚C' de Magnezyum (Mg) elementinin erime sıcaklığına ait endotermik bir pik gözlenmiştir.

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Effect of Nitriding Current Density on the Surface Properties and Crystallite Size of Pulsed Plasma-Nitrided AISI 316L

Cited by 10 publications

References 21 publications

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

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

Direct Current and Pulsed Direct Current Plasma Nitriding of Ferrous Materials a Critical Review

Mekaniksel Alaşımlama İle Üretilen Nanokristal Mg50Cu50 Tozları

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