Low-temperature plasma-assisted nitriding

Czerwiec, T.; Renevier, Nathalie; Michel, H.

doi:10.1016/s0257-8972(00)00792-1

Cited by 187 publications

(73 citation statements)

References 51 publications

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“…It is believed that this phase is very rich in nitrogen. This darkened microstructure is similar to the precipitation of expanded austenite (y n ) [16,17] which is a metastable phase containing high concentrations of nitrogen [16][17][18].…”

Section: Resultsmentioning

confidence: 76%

Plasma Nitriding of Surface Mo-Enriched Sintered Iron

Bendo

Pavanati

Klein

et al. 2011

ISRN Materials Science

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Plain iron samples produced by powder metallurgy were submitted to a single thermal cycle involving plasma-assisted sintering and simultaneous surface alloying with Mo followed by nitriding using a plasma reactor. The microstructural characterization of the samples was carried out by optical and scanning electron microscopy in addition to X-ray diffraction. Microhardness tests were also performed. EDX line profiles of the concentration of Mo from the surface to the bulk of the sintered samples showed that the alloying element diffused down to depths of about 25 μm under the sintering conditions applied. A significant increase in microhardness was observed for samples enriched with Mo and subsequently nitrided. This behavior was attributed to the precipitation of nitrides and the presence of Mo in solid solution.

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Section: Resultsmentioning

confidence: 76%

Plasma Nitriding of Surface Mo-Enriched Sintered Iron

Bendo

Pavanati

Klein

et al. 2011

ISRN Materials Science

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“…Glow discharge plasmas, which are maintained in nitrogen and nitrogen-hydrogen atmospheres at reduced pressures of 10 2 -10 4 Pa, are used in plasma nitridation most commonly, producing several kinds of iron and chromium nitrides and iron-matrix phases containing large amounts of interstitial nitrogen in stainless-steel materials. [1][2][3][4] It is a drawback in the nitriding treatment using a glow discharge plasma that the reaction rate is very slow; in fact, it requires several hours to obtain a nitrided layer having several micrometers in thickness. 1 This is probably because of the low population of excited nitrogen species as well as the low temperature of the substrate in the glow discharge plasma at low gas pressures.…”

Section: Introductionmentioning

confidence: 99%

“…[1][2][3][4] It is a drawback in the nitriding treatment using a glow discharge plasma that the reaction rate is very slow; in fact, it requires several hours to obtain a nitrided layer having several micrometers in thickness. 1 This is probably because of the low population of excited nitrogen species as well as the low temperature of the substrate in the glow discharge plasma at low gas pressures. 5,6 It is thus expected that a nitrogen plasma at atmospheric pressures could provide a higher flux of excited nitrogen species to promote the growth of a nitrided layer; however, it is difficult to produce an atmospheric plasma using a conventional glow discharge.…”

Section: Introductionmentioning

confidence: 99%

Spatially-resolved Spectral Image of a Microwave-induced Plasma with Okamoto-cavity for Nitridation of Steel Substrate

2014

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“…12 It was recently suggested the presence of two different phases in the nitrided layer. 12,13 Furthermore, low-iron metal alloys with fcc-like structure such as Inconel also presented the formation of two different expanded austenite phases. 14 Magnetic force microscopy ͑MFM͒ was used to show that the outermost layer is ferromagnetic and covers up to 80% of the total nitrided layer thickness, 15 whereas the inner layer was shown to be paramagnetic, similar to the bulk material ͑austenitic stainless steel AISI 316͒.…”

Section: Introductionmentioning

confidence: 99%

Magnetic and structural properties of ion nitrided stainless steel

Basso

Pimentel

Weber³

et al. 2009

Journal of Applied Physics

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The magnetic properties and crystalline structure of expanded austenite obtained by ion beam nitriding of AISI 316 steel are investigated. Magnetic force microscopy reveals that the nitrogen expanded austenite has two different layers, an outermost ferromagnetic layer and a paramagnetic layer beneath it. Superimposing the nitrogen concentration profile determined by secondary neutral mass spectrometry and the magnetic force microscopy image, one can see that the paramagnetic-ferromagnetic transition takes place at the inflection point of the nitrogen concentration profile at about 14Ϯ 2 N at. %. Conventional and glancing angle x-ray diffraction suggests that nitrogen could occupy first tetrahedral interstitial positions ͑nitrogen-poor paramagnetic phase͒ and then, after saturation of Cr traps, octahedral interstitial positions ͑nitrogen-rich ferromagnetic phase͒. The ferromagnetic-paramagnetic transition is seen to be governed by Cr ͑traps͒-N interactions.

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Low-temperature plasma-assisted nitriding

Cited by 187 publications

References 51 publications

Plasma Nitriding of Surface Mo-Enriched Sintered Iron

Plasma Nitriding of Surface Mo-Enriched Sintered Iron

Spatially-resolved Spectral Image of a Microwave-induced Plasma with Okamoto-cavity for Nitridation of Steel Substrate

Magnetic and structural properties of ion nitrided stainless steel

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