Low temperature active screen plasma nitriding of 17–4 PH stainless steel

Pinedo, Carlos Eduardo; Larrotta, Sharys Ivonn Varela; Nishikawa, Arthur Seiji; Dong, Hanshan; Li, Xiaoying; Magnabosco, Rodrigo; Tschiptschin, André Paulo

doi:10.1016/j.surfcoat.2016.07.096

Cited by 19 publications

(16 citation statements)

References 23 publications

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“…During the conventional plasma-nitrided (CPN) treatment where the workpiece serves as the cathode of the discharge system, there will be some problems that are difficult to solve, such as the edge effect [12]. The active screen plasma nitriding (ASPN) technology thus came into use [5,[13][14][15][16][17][18][19]. The gas in the furnace is ionized, the surface of metal screen is heated after ion bombardment, and the workpiece reaches nitrided temperature through radiation.…”

Section: Introductionmentioning

confidence: 99%

Effect of Electric Potentials on Microstructure, Corrosion and Wear Characteristic of the Nitrided Layer Prepared on 2Cr13 Stainless Steel by Plasma Nitriding

Zhang

Qiu

et al. 2018

Acta Metall. Sin. (Engl. Lett.)

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Plasma nitriding is a widely used technology to enhance the surface performance and extend the service life of alloy parts. The current research mainly focuses on the influences of time, temperature, gas type and pressure parameters on nitriding behavior, while fewer studies have been conducted on the electric potential. This paper mainly reports the effect of the electric potential on nitriding behavior. Test conditions were set using cathodic, anodic and floating potentials in a plasma nitriding furnace. 2Cr13 stainless steel was nitrided at 450°C for 5 h in an NH 3 atmosphere. The experimental results show that the nitriding treatment can be well performed under the different electric potentials, but differences exist in microstructures, morphologies and performance results of the modified layers. The thickness and hardness values of the nitrided layer are ranked as follows: cathodic [ anodic [ floating potential. The anodic nitrided surface has an obvious particle deposition layer composed of nitrides and oxides. Electrochemical and tribological experiments show that the corrosion resistance and wear resistance were significantly improved after a nitriding treatment using the three electric potentials. Moreover, the floating nitriding treatment resulted in the best tribological performance and corrosion resistance.

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Section: Introductionmentioning

confidence: 99%

Effect of Electric Potentials on Microstructure, Corrosion and Wear Characteristic of the Nitrided Layer Prepared on 2Cr13 Stainless Steel by Plasma Nitriding

Zhang

Qiu

et al. 2018

Acta Metall. Sin. (Engl. Lett.)

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“…Expanded martensite has been reported to form in stainless steels which have a martensitic structure, i.e., martensitic [33,49,[64][65][66][67] and martensitic PH [62,65,[68][69][70][71] stainless steels.…”

Section: Formation Of Expanded Martensitementioning

confidence: 99%

“…Nitriding and nitrocarburizing treatments allowed for the simultaneous aging step for PH steels [62,69,70,87]. Bottoli et al [69] evaluated the effects of both the initial alloy microstructure and the low-temperature thermochemical treatment type on the surface and bulk properties of the Sandvik Nanoflex ® PH stainless steel.…”

Section: Formation Of Expanded Martensitementioning

confidence: 99%

“…The possibility of performing the nitriding treatment after aging, or as a single treatment which allowed both nitriding and aging, was studied by Pinedo et al [70] for a 17-4 PH stainless steel. Even if, for both strategies, modified surface layers consisting of expanded martensite were obtained with nitriding (400 • C, 20 h), a significantly thicker modified layer was produced in the solubilized and aged steel.…”

Section: Formation Of Expanded Martensitementioning

confidence: 99%

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The “Expanded” Phases in the Low-Temperature Treated Stainless Steels: A Review

Borgioli

2022

Metals

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Low-temperature treatments have become a valuable method for improving the surface hardness of stainless steels, and thus their tribological properties, without impairing their corrosion resistance. By using treatment temperatures lower than those usually employed for nitriding or carburizing of low alloy steels or tool steels, it is possible to obtain a fairly fast (interstitial) diffusion of nitrogen and/or carbon atoms; on the contrary, the diffusion of substitutional atoms, as chromium atoms, has significantly slowed down, therefore the formation of chromium compounds is hindered, and corrosion resistance can be maintained. As a consequence, nitrogen and carbon atoms can be retained in solid solutions in an iron lattice well beyond their maximum solubility, and supersaturated solid solutions are produced. Depending on the iron lattice structure present in the stainless steel, the so-called “expanded austenite” or “S-phase”, “expanded ferrite”, and “expanded martensite” have been reported to be formed. This review summarizes the main studies on the characteristics and properties of these “expanded” phases and of the modified surface layers in which these phases form by using low-temperature treatments. A particular focus is on expanded martensite and expanded ferrite. Expanded austenite–S-phase is also discussed, with particular reference to the most recent studies.

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“…Relatively little research has been carried out on the effect of plasma nitriding on martensitic precipitation hardening stainless steel. Some good results were found regarding surface hardness and α′N (nitrogen supersaturated expanded martensite) layer thickness, but often with poor corrosion behavior because of the formation of chromium nitrides during the plasma nitriding process [2,3,4,5,6,7,8,9].…”

Section: Introductionmentioning

confidence: 99%