Pulsed plasma-oxidation of nitrided steel samples

Zlatanović, M.; Popović, N.; Bogdanov, Ž.; Zlatanovic, Sanja

doi:10.1016/s0257-8972(03)00590-5

Cited by 20 publications

(9 citation statements)

References 9 publications

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“…40,41 In addition, the compound zone has an open, porous structure. 42 This can be mechanically abraded to remove the compound zone or oxidized to form a passive film, 43 which enhances the corrosion resistance. Alternatively, the thickness of the compound zone can be controlled by manipulating the plasma nitriding process parameters.…”

Section: Resultsmentioning

confidence: 99%

Effect of Nitriding on the Hydrogen Diffusion Coefficient through AISI 4340

Jebaraj

Morrison

McLaughlin

et al. 2014

J. Electrochem. Soc.

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The effect of plasma nitriding on hydrogen permeation through AISI 4340 was studied both experimentally and theoretically. Effective hydrogen diffusion coefficients were measured for three different AISI 4340 membrane specimens: as-received, nitrided, and nitrided specimens with the compound layer removed by mechanical abrasion. The as-received specimen had a higher diffusion coefficient (2.8 × 10 −6 cm 2 /sec) than the nitrided specimens. The nitrided specimen with the compound layer intact had a much lower hydrogen diffusion coefficient (0.65 × 10 −6 cm 2 /sec) than the specimen without the compound layer (1.9 × 10 −6 cm 2 /sec). These results demonstrate that the γ-Fe 4 N rich compound surface layer and the N that diffuses more deeply into AISI 4340 during plasma nitriding both reduce the effective hydrogen diffusion coefficient. Multiple permeation transients yield evidence for the presence of only reversible trap sites in as-received specimens and the presence of both reversible and irreversible trap sites in nitrided specimens, with and without the compound zone intact. In addition, density functional theory-based molecular dynamics simulations yield hydrogen diffusion coefficients through γ-Fe 4 N (1.5 × 10 −5 cm 2 /sec) one order of magnitude lower than through α-Fe (1.2 × 10 −4 cm 2 /sec), which supports the experimental measurements of hydrogen permeation.

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Section: Resultsmentioning

confidence: 99%

Effect of Nitriding on the Hydrogen Diffusion Coefficient through AISI 4340

Jebaraj

Morrison

McLaughlin

et al. 2014

J. Electrochem. Soc.

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“…2) Free water molecules can be formed by the reaction of hydrogen and oxygen, which are beneficial to the formation of iron oxides [11], and provide the diffusion paths for N atoms [12]. 3) Compact Fe 3 O 4 with high chemical stability was formed on the surface.…”

Section: Discussionmentioning

confidence: 99%

A novel plasma oxynitriding by using plain air for AISI 1045 steel

Liu

Chai

et al. 2015

Vacuum

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Section: Introductionmentioning

confidence: 99%

“…A plasma oxynitriding process can produce a thin continuous oxide layer on the compound layer, which covers the porous compound layer and thus, improving the corrosion and wear resistances. 9,10 For example, Ebrahimi et al reported that the formation of thin oxide layer consisted of Fe 2 O 3 and Fe 3 O 4 on top of the compound layer using plasma oxidation process provides high corrosion resistance 11 Also, Yang et al reported that the oxide thin layer (Fe 2 O 3 /Fe 3 O 4 ), formed via oxynitriding process with optimal gas composition, can show better wear and corrosion resistances than that of a plasma-nitrided sample. 12 As suggested in the previous literature, main phases of the oxide layer prepared by oxynitriding process are Fe 2 O 3 and/or Fe 3 O 4 whose formation is competitive depending on the processing parameters, including atmosphere, oxidation methods, and processing temperature and time.…”

Section: Introductionmentioning

confidence: 99%

Effect of plasma oxynitriding temperature on wear and corrosion resistance of the AISI 4140 steel

Park

Lee

Kim

et al. 2022

Int J Applied Ceramic Tech

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This work presents the effect of oxynitriding process at different temperature on the corrosion resistance and wear behavior of the quenching-and-temperingtreated AISI 4140 steel. The AISI 4140 was plasma nitrided at 500 • C. Subsequently, the plasma oxynitriding was performed on the nitrided AISI 4140 at different temperatures under H 2 O atmosphere. Microstructure and phases of the plasma-oxynitrided samples are investigated, indicating that phase formation of the oxide layer is strongly dependent on processing temperature during plasma oxynitriding: Formation of Fe 3 O 4 is preferred over Fe 2 O 3 at lower processing temperature. Also, it is believed that ε-Fe 2-3 N phase formed by nitriding process plays an important role to promote the formation of Fe 3 O 4 phase during plasma oxynitriding. In order to investigate the mechanical, wear, and corrosion properties of the plasma-oxynitrided samples, Vickers hardness, friction coefficient, and potentiodynamic curves are evaluated, respectively. Compared to a plasma-nitrided sample, the Vickers hardness of the plasma-oxynitrided sample at optimal processing temperature shows a slight decrease of the hardness, but, improved wear and corrosion resistances were observed. It is suggested that wear and corrosion resistance of the oxynitrided sample is strongly dependent on the volume fraction of Fe 3 O 4 phase in the oxide layer.

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Pulsed plasma-oxidation of nitrided steel samples

Cited by 20 publications

References 9 publications

Effect of Nitriding on the Hydrogen Diffusion Coefficient through AISI 4340

Effect of Nitriding on the Hydrogen Diffusion Coefficient through AISI 4340

A novel plasma oxynitriding by using plain air for AISI 1045 steel

Effect of plasma oxynitriding temperature on wear and corrosion resistance of the AISI 4140 steel

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