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

Borowski, T.; Adamczyk‐Cieślak, Bogusława; Brojanowska, A.; Kulikowski, Krzysztof; Wierzchoń, T.

doi:10.5755/j01.ms.21.3.7404

Cited by 7 publications

(10 citation statements)

References 12 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The characteristics of the nitrided layers depend on different nitriding techniques [1,[7][8][9][10], treatment parameters [1,3,[11][12][13][14] and alloy composition [1,3,11,15,16]. Even if the main critical parameter, which influences microstructure and phase composition of the modified layers, is recognized to be the treatment temperature, also treatment pressure plays a very important role.…”

Section: Introductionmentioning

confidence: 99%

Surface Modification of Austenitic Stainless Steel by Means of Low Pressure Glow-Discharge Treatments with Nitrogen

2019

View full text Add to dashboard Cite

When low temperature nitriding of austenitic stainless steels is carried out, it is very important to remove the surface passive layer for obtaining homogeneous incorporation of nitrogen. In the glow-discharge nitriding technique this surface activation is performed by cathodic sputtering pre-treatment, which can heat also the samples up to nitriding temperature. This preliminary study investigates the possibility of producing modified surface layers on austenitic stainless steels by performing low pressure glow-discharge treatments with nitrogen, similar to cathodic sputtering, so that surface activation, heating and nitrogen incorporation can occur in a single step having a short duration (up to about 10 min). Depending on treatment parameters, it is possible to produce different types of modified surface layers. One type, similar to that obtained with low temperature nitriding, consists mainly of S phase and it shows improved surface hardness and corrosion resistance in 5% NaCl solution in comparison with the untreated steel. Another type has large amounts of chromium nitride precipitates, which cause a marked hardness increase but a poor corrosion resistance. These surface treatments influence also water wetting properties, so that the apparent contact angle values become >90°, indicating a hydrophobic behavior.

show abstract

Section: Introductionmentioning

confidence: 99%

Surface Modification of Austenitic Stainless Steel by Means of Low Pressure Glow-Discharge Treatments with Nitrogen

2019

View full text Add to dashboard Cite

show abstract

“…In the remaining two cases, no significant changes were observed. By comparing the obtained results of the authors of Reference [28], it can be observed that the creation of a nitrided layer at 440 • C, with a chamber pressure of 220 Pa and a N 2 /H 2 ratio of 1:1 on the substrate of the sanded surface with 800 grit sandpaper leads to obtaining a lower breakdown potential and polarisation resistance values (E b = +320 mV, R p = +231 kΩ•cm 2 ) than on a polished surface. Referring to the results of previous research of the authors related to the development of a nitrocarburised layer at 440 • C over 6 h on a mechanically polished surface [45], in turn, a higher value of polarisation resistance can be observed as well as the existence of a breakdown potential, as opposed to the transpassivation potential achieved in the paper.…”

Section: Discussionmentioning

confidence: 96%

“…Traditional diffusion processes employing cathode sputtering or ion implantation lead to the increase in surface roughness and damage the structure of diffusion layers generated on austenitic steels, which results in a slight increase of resistance to corrosion or even its decrease [25][26][27]. The processes conducted under conditions of glow discharge, where the processed element is isolated from the cathode and placed outside of a perforated active screen (cathode), lead to significantly better results [28,29]. The obtained layers are characterised by lower roughness and the lack of edge effect in comparison to layers created through a traditional method of glow-discharge processing, which is mostly caused by the elimination of cathode sputtering [Błąd!…”

Section: Introductionmentioning

confidence: 99%

Effect of Nitrided and Nitrocarburised Austenite on Pitting and Crevice Corrosion Resistance of 316 LVM Steel Implants

et al. 2020

Self Cite

View full text Add to dashboard Cite

Harmful lesions occur in the body around multielement stabilisers made of AISI 316 LVM (Low Vacuum Melted) steel, caused by products of pitting, fretting or crevice corrosion. Preventing the effect is possible by modifying the surface of the steel implants. Therefore, the goal of the paper is the comparison of the mechanical and physiochemical properties of plates for treating deformations of the anterior chest wall made of AISI 316 LVM steel, subjected to diffusion and sterilisation processes and exposed to Ringer’s solution. The surface of the implants was subjected to electrochemical polishing, chemical passivation and, in order to modify their properties, nitrocarburised and nitrided diffusion layers were created on selected stabilisers under glow discharge conditions with the use of an active screen at a temperature of 420 °C, over 60 min. The conducted studies involved the examination of the microstructure of the formed layers, surface roughness testing, analysis of contact angles and surface free energy, examination of resistance to pitting and crevice corrosion and examination of nanohardness. On the basis of the results of the conducted studies, it was established that the most advantageous set of properties after sterilisation and exposure to Ringer’s solution was displayed by implants with a formed diffusion nitrocarburised layer.

show abstract

“…The processes were conducted via a semi-industrial device produced by the Institute of Precision Mechanics in Warsaw, Poland. The treatment device was described elsewhere [ 33 ].…”

Section: Methodsmentioning

confidence: 99%

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

Borowski

2021

Materials

Self Cite

View full text Add to dashboard Cite

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.

show abstract

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

Cited by 7 publications

References 12 publications

Surface Modification of Austenitic Stainless Steel by Means of Low Pressure Glow-Discharge Treatments with Nitrogen

Surface Modification of Austenitic Stainless Steel by Means of Low Pressure Glow-Discharge Treatments with Nitrogen

Effect of Nitrided and Nitrocarburised Austenite on Pitting and Crevice Corrosion Resistance of 316 LVM Steel Implants

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

Contact Info

Product

Resources

About