Modifying the structure of glow discharge nitrided layers produced on high-nickel chromium-less steel with the participation of an athermal martensitic transformation

Borowski, T.; Jeleńkowski, J.; Psoda, M.; Wierzchoń, T.

doi:10.1016/j.surfcoat.2009.09.021

Cited by 8 publications

(6 citation statements)

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“…This structure was formed on the steel surface during sample preparation. As a result of the pressure applied on the sample surface during polishing, a plastic deformation-induced martensitic transformation occurred (TRIP effect), a phenomenon also reported by researchers in other studies [ 37 ]. In the case of layers nitrided and nitrocarburised at a temperature of 440 °C, expanded peaks were observed, which corresponded to nitrogen S-phase (γ N ) or nitro-carbon S-phase (γ NC ), respectively.…”

Section: Resultssupporting

confidence: 59%

“…At a certain concentration of nitrogen and/or carbon, the A s temperature reaches a value equal to the process temperature (440 °C) resulting in the transformation of the α′ N nitrogen martensite or α′ C carbon martensite to reversed nitrogen S-phase (γ N ) or carbon S-phase (γ C ). A similar mechanism was observed during the nitriding process of metastable chromium-free, high-nickel austenitic steel [ 37 ] and AISI 304 steel [ 38 ] previously subjected to martensitic transformations. In addition, the layers did not contain the CrN phase, the presence of which contributes to the segregation of chromium in the austenitic structure in the proximate grain-boundary locations and causes intergranular corrosion [ 28 ].…”

Section: Resultssupporting

confidence: 53%

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Enhancing the Corrosion Resistance of Austenitic Steel Using Active Screen Plasma Nitriding and Nitrocarburising

Borowski

2021

Materials

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AISI 316L steel was subjected to active screen plasma nitriding and nitrocarburising. The processes were carried out at 440 °C for 6 h. The nitriding process employed an atmosphere of nitrogen and hydrogen, while nitrocarburising was carried out in nitrogen, hydrogen and methane. The processes yielded structures consisting of nitrogen and nitro-carbon expanded austenite, respectively. Microhardness was measured via the Vickers method, surface roughness using an optical profilometer, microstructure by means of light microscopy, while a scanning electron microscope (SEM) served to determine surface topography. Phase composition, lattice parameter and lattice deformation tests were carried out using the X-ray diffraction (XRD) method. Corrosion resistance measurements were performed in a 0.5 M NaCl solution using the potentiodynamic method. The produced layers showed very high resistance to pitting corrosion, while the pitting potential reached 1.5 V, a value that has not yet been recorded in a chloride environment. After the passive layer was broken down, there was a clear deceleration of pitting in the nitrocarburised layer. It was found that in the case of nitro-carbon expanded austenite, pits are formed much slower compared to the nitrogen austenite layer.

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Section: Resultssupporting

confidence: 59%

Section: Resultssupporting

confidence: 53%

Enhancing the Corrosion Resistance of Austenitic Steel Using Active Screen Plasma Nitriding and Nitrocarburising

Borowski

2021

Materials

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“…In the process of nitriding, the α'd deformation martensite is transformed into α'N nitrogen martensite and then into γN nitrogen austenite, that is why α'd martensite is no longer seen in the nitrided layers. This mechanism has been precisely defined in a separate publication, in which metastable high-nickel content austenite was studied [13].…”

Section: Resultsmentioning

confidence: 99%

Surface modification of austenitic steel by various glow-discharge nitriding methods

Borowski

Adamczyk‐Cieślak²,

Brojanowska³

et al. 2015

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The article presents a characterisation of nitrided layers produced on austenitic X2CrNiMo17-12-2 (AISI 316L) stainless steel in the course of glow-discharge nitriding at cathodic potential, at plasma potential, and at cathodic potential incorporating an active screen. All processes were carried out at 440 °C under DC glow-discharge conditions and in 100 kHz frequency pulsed current. The layers were examined in terms of their microstructure, phase and chemical composition, morphology, surface roughness, hardness, wear, and corrosion resistance. Studies have shown a strong influence of the type of nitriding method used and of the electrical conditions on the microstructure and properties of the diffusion layers formed.

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“…2Θ = 44.5° angle is observed, which indicates bodycentered cubic structure deforming martensite presence (A2), developed during technological wires drawing. In glow-discharge nitrogening process deforming martensite α' transforms into nitrogen martensite and next in nitrogen austenite γ, thus martensite α' cannot be seen in nitrogened layers any more [24]. In case of Centraliss wire (Fig.…”

Section: Resultsmentioning

confidence: 99%

Archives of Metallurgy and Materials

Kamiński¹,

Małkiewicz²,

Rębiś³

et al. 2020

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The oral cavity due to its temperature fluctuations, changing pH, high humidity, action of mechanical forces and the presence of microorganisms is a favorable environment for degradation of dental materials. The paper presents comparative results on orthodontic arch-wires AISI304 steel before and after low temperature plasma nitriding carried out at cathodic potential (conventional) and at plasma potential, i.e. in a process incorporating an active screen. Corrosion resistance test on nitrided layers produced on stainless steel were carried out via electrochemical impedance spectroscopy (EIS) and the potentiodynamic method in non-deaerated artificial saliva solution at 37°C. The results were complemented with analysis of the structure, surface topography and microhardness. The results showed an increase in corrosion resistance of AISI304 steel after conventional glow-discharge nitriding.

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Modifying the structure of glow discharge nitrided layers produced on high-nickel chromium-less steel with the participation of an athermal martensitic transformation

Cited by 8 publications

References 8 publications

Enhancing the Corrosion Resistance of Austenitic Steel Using Active Screen Plasma Nitriding and Nitrocarburising

Enhancing the Corrosion Resistance of Austenitic Steel Using Active Screen Plasma Nitriding and Nitrocarburising

Surface modification of austenitic steel by various glow-discharge nitriding methods

Archives of Metallurgy and Materials

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