Effect of plasma nitriding on the structural stability and hydrogen absorption capability of Pd-coated Nb during thermal treatment

Ohtsu, Naofumi; Kozuka, Taro; Shibata, Yuga; Yamane, Masayuki

doi:10.1016/j.apsusc.2017.06.196

Cited by 5 publications

(3 citation statements)

References 29 publications

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“…Therefore, plasma nitriding was adopted, which can produce a nitrided surface on an iron substrate with a low gas flow. In this study, a self-made direct-current glow-discharge plasma equipment was used (Hirano et al, 2015; Ohtsu et al, 2017). The mainframe of the equipment was a high-vacuum chamber that could evacuate down to approximately 4 × 10 −4 Pa using a turbo molecular pump.…”

Section: Methodsmentioning

confidence: 99%

Quantitative Analysis of Nitrogen by Atom Probe Tomography Using Stoichiometric γ′-Fe₄N Consisting of ¹⁵N Isotope

et al. 2021

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The nitrogen deficiency in steels measured by atom probe tomography (APT) is considered to arise from the obscurement of singly charged dimer nitrogen ions (N2+) by the iron-dominant peak (56Fe2+) at 28 Da. To verify this by quantifying the amount of N2+ ions, γ′-Fe4N consisting of the 15N isotope was prepared on iron substrates by plasma nitriding using a nitrogen isotopic gas (15N2). Although considerable amounts of 15N2+ were observed at 30 Da without overlap with any iron peak, the observed nitrogen concentrations of γ′-Fe4N were clearly lower than the stoichiometric composition (19–20 at%), using both pulsed voltage and pulsed laser atom probes. The origin of the missing nitrogen, excluding nitrogen obscured by other ion species, was predicted to be the occurrence of neutral nitrogen or nitrogen gas molecules in field evaporation. The generation rate of iron nitride ions (FeN2+) for 15N was significantly lower than that for 14N in γ′-Fe4N, which affected the amount of the missing nitrogen. The isotope effect suggests that the isotopic ratio cannot always be determined from only one ion species among the multiple species observed in the APT analysis. We discuss the mechanism of the isotope effect in FeN2+ formation by field evaporation.

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Section: Methodsmentioning

confidence: 99%

Quantitative Analysis of Nitrogen by Atom Probe Tomography Using Stoichiometric γ′-Fe₄N Consisting of ¹⁵N Isotope

et al. 2021

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“…[8][9][10][11][12][13][14][15] Different studies have demonstrated that plasma nitriding at relatively low temperatures (below 450 • C) can allow obtaining a surface layer of nitrides due to diffusion of nitrogen during this process, which results in an increase of the hardness and wear resistance. [16][17][18][19] Zappelino et al, 20 presented a higher dry sliding wear resistance in samples of cold work tool steel Vanadis 10, with a cryogenic treatment samples followed by plasma nitriding. In addition, this process allows to reduce the treatment time, obtain minimal distortions, low gas consumption, energy and no harm to the environment when compared with other surface modification techniques.…”

Section: Introductionmentioning

confidence: 99%

“…Different studies have demonstrated that plasma nitriding at relatively low temperatures (below 450°C) can allow obtaining a surface layer of nitrides due to diffusion of nitrogen during this process, which results in an increase of the hardness and wear resistance 16‐19 . Zappelino et al, 20 presented a higher dry sliding wear resistance in samples of cold work tool steel Vanadis 10, with a cryogenic treatment samples followed by plasma nitriding.…”

Section: Introductionmentioning

confidence: 99%

Effect of plasma nitriding time on the structural and mechanical properties of AISI‐O1 steel

Araújo

Ferreira

et al. 2020

Engineering Reports

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In this paper, the effect of plasma nitriding time on the improvement of surface microhardness of AISI O1 steel as a strategy to increase its wear resistance was addressed. The plasma nitriding was carried out in a controlled atmosphere (80% H 2(g) and 20% N 2(g)), temperature (500 • C), and pressure (6 mbar), during the different amount of time (4, 5, and 6 hours). The material was characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), energy dispersive spectroscopy (EDS), and microhardness measurements. Moreover, microhardness measurements were carried out to investigate the mechanical properties. From the results, it was verified that the XRD patterns, SEM images, and EDS spectra confirmed the formation of a layer with ε-Fe 3 N and γ ′-Fe 4 N phases in all nitrided samples. The sample AISI-O1 steel, which was nitrided for 6 hours, exhibited a hardness about 46% higher than the one measured for the untreated sample. This sample also showed the thicker layer, with a mean of 7.22 μm. Therefore, this thermochemical treatment can improve mechanical properties in AISI O1 steel, and suggest its use in compression tools to improve this tools life.

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Multiphase Nb–TiCo alloys: The significant impact of surface corrosion on the structural stability and hydrogen permeation behaviour

Yan

Min

Huang

et al. 2019

International Journal of Hydrogen Energy

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Effect of plasma nitriding on the structural stability and hydrogen absorption capability of Pd-coated Nb during thermal treatment

Cited by 5 publications

References 29 publications

Quantitative Analysis of Nitrogen by Atom Probe Tomography Using Stoichiometric γ′-Fe₄N Consisting of ¹⁵N Isotope

Quantitative Analysis of Nitrogen by Atom Probe Tomography Using Stoichiometric γ′-Fe₄N Consisting of ¹⁵N Isotope

Effect of plasma nitriding time on the structural and mechanical properties of AISI‐O1 steel

Multiphase Nb–TiCo alloys: The significant impact of surface corrosion on the structural stability and hydrogen permeation behaviour

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Effect of plasma nitriding on the structural stability and hydrogen absorption capability of Pd-coated Nb during thermal treatment

Cited by 5 publications

References 29 publications

Quantitative Analysis of Nitrogen by Atom Probe Tomography Using Stoichiometric γ′-Fe4N Consisting of 15N Isotope

Quantitative Analysis of Nitrogen by Atom Probe Tomography Using Stoichiometric γ′-Fe4N Consisting of 15N Isotope

Effect of plasma nitriding time on the structural and mechanical properties of AISI‐O1 steel

Multiphase Nb–TiCo alloys: The significant impact of surface corrosion on the structural stability and hydrogen permeation behaviour

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Quantitative Analysis of Nitrogen by Atom Probe Tomography Using Stoichiometric γ′-Fe₄N Consisting of ¹⁵N Isotope

Quantitative Analysis of Nitrogen by Atom Probe Tomography Using Stoichiometric γ′-Fe₄N Consisting of ¹⁵N Isotope