Technological importance of plasma-induced nitrided and carburized layers on steel

Staines, A. M.; Bell, Thomas A.

doi:10.1016/0040-6090(81)90289-3

Cited by 59 publications

(19 citation statements)

References 5 publications

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“…In the surface side, the nitrogen chemical potential could be regarded as the same for all alloys, because their nitriding conditions are the same. The sources of nascent nitrogen have been proposed to be the nitrogen ions impinging on the workpiece (the cathode) and the decomposition of high-nitrogen nitrides deposited on the surface to low-nitrogen nitrides in the sequence, e.g., FeN fi Fe 2 N fi Fe 3 N fi Fe 4 N. [1,2] Therefore, a substrate with a lower chemical potential for nitrogen would induce a larger driving force for nitrogen to diffuse inward. It is well known that the solubility of carbon or nitrogen is relatively low in bcc lattice as compared to fcc lattice, because bcc provides smaller interstitial sites for interstitial atoms.…”

Section: A Effect Of Aluminum Content On Nitrided Microstructure Andmentioning

confidence: 99%

“…SURFACE hardening by means of plasma nitriding [1][2][3] has been successfully used to improve the wear resistance, fatigue life, and corrosion resistance of parts such as cams, gears, or molds without affecting the softer but tougher interior of the parts. Particularly, plasma nitriding is used to deal with the materials that are nitrided difficultly by conventional nitriding techniques.…”

Section: Introductionmentioning

confidence: 99%

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Effect of Aluminum Content on Plasma-Nitrided Al x CoCrCuFeNi High-Entropy Alloys

Tang

2009

Metall Mater Trans A

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High-entropy alloys (HEAs) Al x CoCrCuFeNi with different aluminum contents (x = 0 to 1.8) were plasma nitrided at 525°C for 45 hours with an aim to develop wear-resistant structural parts. The nitrided layer comprises a well-nitrided dendrite phase and an un-nitrided Cu-rich interdendrite phase. Surface hardening is a result of the formation of various nitrides in the nitrided dendrite: CrN, Fe 4 N, and AlN. With increasing aluminum content, the hardness of the nitrided layer increases due to the increased amount of hard AlN phase and the increased volume fraction of bcc phase being harder than the fcc one. The nitrided layer thickness shows an apparent decrease with the increasing aluminum content of the alloy. The present alloy system provides a wide range of substrate hardness from Hv 170 to 560 before nitriding, which even becomes harder by around Hv 30 after nitriding. For Al 0.5 CoCrCuFeNi alloy having the highest surface hardness of Hv 1300, a layer thickness of 23 lm, and a substrate hardness of Hv 300, an adhesive wear test confirms its superior wear resistance as being 17 times that of the un-nitrided samples.

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Section: A Effect Of Aluminum Content On Nitrided Microstructure Andmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Effect of Aluminum Content on Plasma-Nitrided Al x CoCrCuFeNi High-Entropy Alloys

Tang

2009

Metall Mater Trans A

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“…On the other hand, plasma assisted thermochemical techniques have experienced fast industrial acceptance between the 1970s and 1980s, making it vital to many of the largest world manufacturing industries 2 . The advantages over conventional thermochemical treatments (solid, liquid and gas media) include: shorter cycle times, greater energy efficiency, low gas consumption, lower environmental impact by the strongly reduced emission of pollutants or toxic wastes, the obtainment of finished surfaces, among others [3][4][5] .…”

Section: Introductionmentioning

confidence: 99%

Low-temperature Plasma Assisted Thermochemical Treatments of AISI 420 Steel: Comparative Study of Obtained Layers

2015

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Formation of metastable C-, N-, or even Formation of metastable C-, N-, or even C/N-expanded phases can be observed for typical non-equilibrium conditions attained at the plasma assisted thermochemical treatments when temperatures relatively low are used. In present work, kinetics data are considered in a comparative study comprising low-temperature plasma assisted carburizing, nitriding and nitrocarburizing of AISI 420 martensitic stainless steel samples treated at 350, 400, and 450 °C, aiming to put in evidence the main metallurgical differences of the obtained layers. Microstructural characterization and hardness measurement results for untreated and treated sample surfaces show significant difference for the carburized layer growth in relation to that verified for the nitrided and nitrocarburized layers. While the carburized layer is constituted of a thin outer layer and a deep diffusion layer, just the opposite was observed for the other two treatments, id est., formation of thicker outer layers and thinner diffusion layers. Finally, carbide-/nitride-precipitation-free layers were supposedly obtained for samples carburized, nitrided, and nitrocarburized at 350 °C temperature.

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“…3,4) The main motivation of prior research has been to carry out nitriding and subsequent deposition of protective coatings on the nitrided surfaces in the same processing chamber. However, conventional nitriding processes such as ion nitriding 5,6) done using a glow discharge current are difficult to implement without the formation of a nitride compound layer at the steel surface.…”

Section: Introductionmentioning

confidence: 99%

Improvement of the Surface Layer of Steel Using Microwave Plasma Nitriding

et al. 2004

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Microwave plasma was employed for the nitriding of SCM445 steel and characteristics of the steel obtained by this process were compared with those of steel treated by conventional ion nitriding. The latter showed a large amount of globular shaped nitride compounds around 1-2 mm size precipitated on the steel surface and surface coarsening after ion nitriding. However, microwave plasma nitriding successfully produced a nitrided steel without a compound layer and a diffusion layer thickness of more than 0.5 mm was achieved at gas composition of 30%N 2 -70%H 2 (500 C, 2 h). Also, a smooth surface was also achieved. Microwave plasma nitriding was capable of producing just the diffusion layer with a good surface condition for subsequent deposition of a protective coating.

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Technological importance of plasma-induced nitrided and carburized layers on steel

Cited by 59 publications

References 5 publications

Effect of Aluminum Content on Plasma-Nitrided Al x CoCrCuFeNi High-Entropy Alloys

Effect of Aluminum Content on Plasma-Nitrided Al x CoCrCuFeNi High-Entropy Alloys

Low-temperature Plasma Assisted Thermochemical Treatments of AISI 420 Steel: Comparative Study of Obtained Layers

Improvement of the Surface Layer of Steel Using Microwave Plasma Nitriding

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