Material condition tailored to plasma nitriding process for ensuring corrosion and wear resistance of austenitic stainless steel

Köster, K.F.; Kaestner, Peter; Bräuer, Günter; Hoche, Holger; Troßmann, Torsten; Oechsner, Matthias

doi:10.1016/j.surfcoat.2011.10.059

Cited by 33 publications

(16 citation statements)

References 8 publications

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“…Therefore, low-temperature nitriding and carburizing could be applied to austenitic stainless steel plates used under severe friction conditions. In addition, these treatments restrict the formation of chromium nitride or carbide, maintaining the corrosion resistance [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17].…”

Section: Introductionmentioning

confidence: 99%

Wear and Corrosion Properties of Cold-Sprayed AISI 316L Coatings Treated by Combined Plasma Carburizing and Nitriding at Low Temperature

Adachi

Ueda

2018

Coatings

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Cold-sprayed AISI 316L stainless steel coatings are treated to form an austenite phase with excessive dissolved nitrogen (known as the S-phase) by plasma nitriding at temperatures below 450 • C. The S-phase is a hard and wear-resistant layer with high corrosion resistance. However, the S-phase layer formed after only nitriding is thin and the hardness abruptly decreases at a certain depth; it lacks mechanical reliability. We examined two types of combined low-temperature plasma treatment to enhance the mechanical reliability of the S-phase layer: (i) sequential and (ii) simultaneous. In the sequential plasma treatment, the carburizing step was followed by nitriding. In the simultaneous treatment, the nitriding and carburizing steps were conducted at the same time. Both combined plasma treatments succeeded in thickening the S-phase layers and changed the hardness depth profiles to decrease smoothly. In addition, anodic polarization measurements indicated that sequential treatment involving carburizing followed by nitriding for 2 h each resulted in high corrosion resistance.However, plasma-sprayed stainless steel coatings include oxide layers, cracks, and pores in their structure, which deteriorate the corrosion resistance considerably.Cold-spraying is not a fusing process but a solid particle stacking process. Hence, cold-sprayed coatings are without any oxides, similar to a bulk steel structure [23]. It was reported that thick cold-sprayed 316L stainless steel coatings show electrochemical polarization behavior similar to bulk stainless steels [24]. Therefore, it is expected that cold-sprayed AISI 316L coatings can be applied as corrosion protective coatings. Additionally, Villa et al. reported that cold-sprayed 316L coatings can be hardened by cold working during the deposition process, which can also result in increased strength, and the abrasive wear resistance of the coating is in the same order of magnitude as that of coatings produced by HVOF [25]. However, the hardness of the 316L coatings was 358 ± 36 HVN, which is insufficient to apply under severe wear conditions.We have previously reported low-temperature plasma nitriding of cold-sprayed AISI 316L coatings to successfully improve the Vickers hardness to 1200 HV [26]. In particular, remelted AISI 316L coatings by a postlaser treatment had excellent corrosion protection for ordinary steel substrates due to a dense microstructure.However, there is a concern that S-phase layers formed by nitriding without carburizing could be delaminated when an external force is applied, because the hardness of the S-phase layers declines drastically at a certain depth. Low-temperature treatments combining nitriding and carburizing have been reported to result in a milder hardness distribution (with hardness not declining drastically), excellent wear resistance, and thickening of the S-phase layers. There are two types of combined treatments-(i) sequential and (ii) simultaneous. In the sequential treatment, carburizing is followed by nitriding [27][28][29]. Meanwhile, in ...

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Section: Introductionmentioning

confidence: 99%

Wear and Corrosion Properties of Cold-Sprayed AISI 316L Coatings Treated by Combined Plasma Carburizing and Nitriding at Low Temperature

Adachi

Ueda

2018

Coatings

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“…As reviewed by Dong [1], many researches have been devoted to study the microstructure and crystal lattice characteristics of the S phase, and the treatment techniques which allow producing modified surface layers consisting of this phase. The remarkable increase of hardness and corrosion resistance in chloride-ion containing solutions, shown by the S phase, has focused the interest especially on mechanical [1,[3][4][5], tribological [1,3,6,7] and corrosion resistance [1,3,[8][9][10] properties of the low temperature nitrided austenitic stainless steels.…”

Section: Introductionmentioning

confidence: 99%

Influence of surface morphology and roughness on water wetting properties of low temperature nitrided austenitic stainless steels

Borgioli

Galvanetto

Bacci

2014

Materials Characterization

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“…Sections 3-5) that, if relevant, it allows in some respects for verification of the correct application of the bevel method. In our case where the temperature was not more than about 420°C, precipitation of chromium nitride and ferrite was not expected to be important [25][26][27], so that the nitrated layer consisted basically of γ Ν phase (also called S phase or "expanded austenite", resulting from supersaturating of nitrogen in austenite lattice). A chemical etching (Marble's reagent) revealed the interface, leaving the nitrated layer unetched.…”

Section: Point By Point Approachmentioning

confidence: 76%

Measuring coating internal stresses by the curvature method applied to a beveled sample

Mezin¹,

Hemel²

2014

Surface and Coatings Technology

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Material condition tailored to plasma nitriding process for ensuring corrosion and wear resistance of austenitic stainless steel

Cited by 33 publications

References 8 publications

Wear and Corrosion Properties of Cold-Sprayed AISI 316L Coatings Treated by Combined Plasma Carburizing and Nitriding at Low Temperature

Wear and Corrosion Properties of Cold-Sprayed AISI 316L Coatings Treated by Combined Plasma Carburizing and Nitriding at Low Temperature

Influence of surface morphology and roughness on water wetting properties of low temperature nitrided austenitic stainless steels

Measuring coating internal stresses by the curvature method applied to a beveled sample

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