Microstructure and Wear Behavior of DC-Pulsed Plasma Nitrided AISI 316L Austenitic Stainless Steel

Heras, Evangelina De Las; Santamaría, Daniel González; García‐Luis, Alberto; Cabo, Amado; Brizuela, Marta; Ybarra, Gabriel; Míngolo, N.; Brühl, Sonia Patricia; Corengia, P.

doi:10.1002/ppap.200731809

Cited by 18 publications

(14 citation statements)

References 18 publications

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“…Rolling-sliding tests (10% sliding), carried out with an Amsler wear testing machine in dry conditions using the same sample type as counterpart, have shown that the nitrided samples had a low wear rate as long as the modified layer was not broken, i.e., with low applied load (490 N) [201]. As the applied load increased, the nitrided layer might break, and plastic deformation phenomena were observed in the subsurface layers; the wear rate increased, but tended to remain smaller than that of untreated samples.…”

Section: Tribological Propertiesmentioning

confidence: 99%

From Austenitic Stainless Steel to Expanded Austenite-S Phase: Formation, Characteristics and Properties of an Elusive Metastable Phase

Borgioli

2020

Metals

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Austenitic stainless steels are employed in many industrial fields, due to their excellent corrosion resistance, easy formability and weldability. However, their low hardness, poor tribological properties and the possibility of localized corrosion in specific environments may limit their use. Conventional thermochemical surface treatments, such as nitriding or carburizing, are able to enhance surface hardness, but at the expense of corrosion resistance, owing to the formation of chromium-containing precipitates. An effective alternative is the so called low temperature treatments, which are performed with nitrogen- and/or carbon-containing media at temperatures, at which chromium mobility is low and the formation of precipitates is hindered. As a consequence, interstitial atoms are retained in solid solution in austenite, and a metastable supersaturated phase forms, named expanded austenite or S phase. Since the first studies, dating 1980s, the S phase has demonstrated to have high hardness and good corrosion resistance, but also other interesting properties and an elusive structure. In this review the main studies on the formation and characteristics of S phase are summarized and the results of the more recent research are also discussed. Together with mechanical, fatigue, tribological and corrosion resistance properties of this phase, electric and magnetic properties, wettability and biocompatibility are overviewed.

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Section: Tribological Propertiesmentioning

confidence: 99%

From Austenitic Stainless Steel to Expanded Austenite-S Phase: Formation, Characteristics and Properties of an Elusive Metastable Phase

Borgioli

2020

Metals

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“…However the intensity of Fe 2-3 N and Fe 4 N peaks were significantly weaker than that of α-Si 3 N 4 phase [28][29][30].…”

Section: Identification Of Nitride and Silicon Nitride Phasesmentioning

confidence: 83%

Surface Characteristics of Silicon Nitride Compounds Deposited on Plasma Nitrided Austenitic Stainless Steels 316L

Rastkar¹,

Akbari²

2014

cme

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Silicon nitride compound deposited by plasma enhanced chemical vapor deposition (PECVD) on plasma nitrided stainless steel 316L using tetraethylorthosilicate (TEOS):H 2 :N 2 mixtures. Plasma nitriding is extensively used to improve the hardness and wear performance of steels. It is also known that silicon nitride compounds can have interesting properties, such as low friction coefficient, high hardness and wear resistance. Therefore the deposition processes were carried out at optimized gas compositions and temperatures in order to obtain a combination of the best mechanical and enhanced tribological properties. The composition and structure of the surface layers were characterized using XRD, Glancing angle X-ray diffraction (GAXRD), optical and EDX built in electron microscopy, Microhardness and pin-on-disc wear tests. The compound of α-Si 3 N 4 was found on the top surfaces of PECVD and plasma nitrided austenitic stainless steel 316 L. The nitride compounds were composed of Fe 2-3 N, Fe 4 N in addition to chromium nitride. PECVD treatments substantially improved the hardness and wear resistance of plasma nitrided SS 316 L and reduced the friction coefficient and wear rate of the samples. The investigation showed that the combination of PECVD of organosilicon compounds and plasma nitriding results in superior high hardness, low friction and high wear resistance of treated surfaces if compared to those of conventional plasma nitrided surfaces.

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“…It is later shown that the dark portions in the top layers belong to CrN precipitates and -Si3N4 phase. The bright layer underneath the dark layers is most probably composed of Fe2-3N and Fe4N compounds containing Cu element [30].…”

Section: Microstructural Analysismentioning

confidence: 99%

“…Brittleness, low toughness and high hardness of such ceramics as silicon nitride ( -Si3N4) limit the junction-growth at asperity contacts and keep friction coefficient very low even when interlocking of asperities take a large part of friction in unlubricated pin on disk sliding in air [32]. It may also be added that the resistance increases by the work hardening effect that always occurs in austenitic stainless steel, even in nitrided or surface treated steel when the treated layer is broken [30].…”

Section: Friction Behavior and Wear Lossmentioning

confidence: 99%

Phase Structure, Wear Resistance and Antimicrobial Response of Austenitic Stainless Steels 316L by Sputtering Cu during Plasma Nitriding and PECVD of Silicon Nitride

Rastkar¹

2014

J. Coat. Sci. Technol.

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The surface of stainless steel 316L was plasma nitrided and subsequently deposited with silicon nitride from tetraethylorthosilicate (TEOS):H2:N2 gas mixtures by plasma enhanced chemical vapor deposition (PECVD). A copper mesh was employed to sputter copper atoms onto the surface during the two processes to consider its effect on the microstructure, tribology and antibacterial response of hard surface layers.The surface layers were characterized using XRD, optical and SEM microscopy, EDX analysis, microhardness test, pin-on-disc wear tests and microbial viability test. -Si3N4 was found on the top surfaces of two steps processed stainless steel 316 L. Fe2-3N, Fe4N and CrN were identified in the compound layers. The overall thickness of the surface layers were more than 60 m. The two step treatments improved the hardness up to 1600 HV0.1. The combination of plasma nitriding (with Cu sputtering) and PECVD of silicon nitride compound (with Cu sputtering) of SS 316 L resulted in superior high hardness, 3 times lower friction and 10 times higher wear resistance of treated surfaces if compared to those of conventional plasma nitrided surfaces.Cu addition to single plasma nitriding resulted in an effective reduction of 100% of Escherichia coli (E. coli) within 2 to 3 h. However the bacteria viability after the two step processes with Cu addition diminished to zero in 3.5 to 4 h. The antimicrobial response of the surfaces depends mainly on the Cu action and does not interfere with the wear resistance of the surfaces.

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Microstructure and Wear Behavior of DC-Pulsed Plasma Nitrided AISI 316L Austenitic Stainless Steel

Cited by 18 publications

References 18 publications

From Austenitic Stainless Steel to Expanded Austenite-S Phase: Formation, Characteristics and Properties of an Elusive Metastable Phase

From Austenitic Stainless Steel to Expanded Austenite-S Phase: Formation, Characteristics and Properties of an Elusive Metastable Phase

Surface Characteristics of Silicon Nitride Compounds Deposited on Plasma Nitrided Austenitic Stainless Steels 316L

Phase Structure, Wear Resistance and Antimicrobial Response of Austenitic Stainless Steels 316L by Sputtering Cu during Plasma Nitriding and PECVD of Silicon Nitride

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