Glow discharge plasma nitriding of low alloy steel

Rao, K. Ram Mohan; Trinadh, Kalimi; Nouveau, Corinne

doi:10.1016/j.matpr.2019.08.224

Cited by 10 publications

(4 citation statements)

References 15 publications

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“…The diffusion coefficient of nitrogen in low alloy steels was found to be 2.23 × 10 −13 m 2 /s, which is faster than in alloyed steels and conventional nitriding [10].…”

Section: Introductionmentioning

confidence: 82%

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Hydrogen Embrittlement of Nitrogenating Layer on Martensitic Alloys

Moreno,

Nachmana,

Bashan

et al. 2023

JMMCE

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Nitriding of the surface in martensitic stainless steels is commonly carried out to improve their wear resistance. The process of plasma nitriding in stainless steel is influenced by two mechanisms: physical diffusion through the surface and chemical gas-metal reaction. The inner nitriding interaction involves the simultaneous penetration and formation of a solid solution, as well as the interaction of nitrogen with specific alloying elements, resulting in the development of homogeneous and heterogeneous structures. Our study concludes that the observed intergranular hydrogen embrittlement and crack formation during the surface nitridation process of AMS 5719 martensite alloy steel can be attributed to the ammonium concentration of approximately 50% at a temperature of 530˚C.

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“…The diffusion coefficient of nitrogen in low alloy steels was found to be 2.23 × 10 −13 m 2 /s, which is faster than in alloyed steels and conventional nitriding [10].…”

Section: Introductionmentioning

confidence: 82%

“…XRD analysis was conducted to identify the ε and ϒ' nitride phases after plasma nitriding of a low alloy steel. The increase in hardness was attributed to these phases, which induce stress on the surface [10].…”

Section: Introductionmentioning

confidence: 99%

Hydrogen Embrittlement of Nitrogenating Layer on Martensitic Alloys

Moreno,

Nachmana,

Bashan

et al. 2023

JMMCE

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“…Such layer is created on the surface by nitrogen diffusing into the substrate of the steel and react with iron and other alloying elements. According to Fe-N phase diagram, for conventional nitriding, nitrided layer are composed of a diffusion zone and a compound layer which consist predominantly of iron nitrides ε-Fe 2-3 N and γ′-Fe 4 N [4][5][6][7]. In general, the wear resistance improvement depends on the properties of the whole nitrided layer (compound layer + diffusion layer) [8][9][10].…”

Section: Introductionmentioning

confidence: 99%

Influence of compound layer on the corrosion resistance of low alloy steel in a 3.5% NaCl solution

Wang

2024

Eng. Res. Express

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Samples of AISI 4140 low alloy steel were nitrided at different conditions by using plasma nitriding. The optical microscopy observation and X-ray diffraction analysis showed that a 3~14 m thick compound layer composed of -Fe2–3N and γ′-Fe4N was formed on the surface after nitriding treatments. The corrosion behavior was evaluated by measuring the anodic polarization curves in a 3.5% NaCl solution along with the observation of corroded surfaces and cross-sectional morphologies using optical and scanning electron microscope. The results indicated that the corrosion resistance of low alloy steel was significantly enhanced through the formation of compound layer. The thickness of compound layer was one important factor in determining its corrosion resistance.

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“…The main CTT methods are carburizing (carbon saturation) [ 6 ], nitriding (nitrogen saturation), carried out in recent years by the ion-plasma method in a glow discharge [ 7 ], which, unlike traditional gas nitriding in furnaces, reduces the process duration by 1.5–2 times and is more environmentally friendly [ 8 ] and nitrocarburizing (saturation with carbon and nitrogen) [ 9 ].…”

Section: Introductionmentioning

confidence: 99%

Technological Features for Controlling Steel Part Quality Parameters by the Method of Electrospark Alloying Using Carburezer Containing Nitrogen—Carbon Components

et al. 2022

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A new method of surface modification based on the method of electrospark alloying (ESA) using carburizer containing nitrogen—carbon components for producing coatings is considered. New processes have been proposed that include the step of applying saturating media in the form of paste-like nitrogenous and nitrogenous-carbon components, respectively, onto the surface without waiting for those media to dry, conducting the ESA process with the use of a steel electrode-tool, as well as with a graphite electrode-tool. Before applying the saturating media, an aluminium layer is applied onto the surface with the use of the ESA method at a discharge energy of Wp = 0.13–6.80 J. A saturating medium in the form of a paste was applied to the surfaces of specimens of steel C22 and steel C40. During nitriding, nitrocarburizing and carburization by ESA (CESA) processes, with an increase in the discharge energy (Wp), the thickness, micro hardness and continuity of the “white layer” coatings, as well as the magnitude of the surface roughness, increase due to saturation of the steel surface with nitrogen and/or carbon, high cooling rates, formation of non-equilibrium structures, formation of special phases, etc. In the course of nitriding, nitrocarburizing and CESA processing of steels C22 and C40, preliminary processing with the use of the ESA method by aluminum increases the thickness, microhardness and continuity of the “white layer”, while the roughness changes insignificantly. Analysis of the phase composition indicates that the presence of the aluminum sublayer leads to the formation of the aluminum-containing phases, resulting in a significant increase in the hardness and, in addition, in an increase in the thickness and quality of the surface layers. The proposed methods can be used to strengthen the surface layers of the critical parts and their elements for compressor and pumping equipment.

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Glow discharge plasma nitriding of low alloy steel

Cited by 10 publications

References 15 publications

Hydrogen Embrittlement of Nitrogenating Layer on Martensitic Alloys

Hydrogen Embrittlement of Nitrogenating Layer on Martensitic Alloys

Influence of compound layer on the corrosion resistance of low alloy steel in a 3.5% NaCl solution

Technological Features for Controlling Steel Part Quality Parameters by the Method of Electrospark Alloying Using Carburezer Containing Nitrogen—Carbon Components

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