Structure and corrosion behavior of ultra-thick nitrided layer produced by plasma nitriding of austenitic stainless steel

Huang, Zhen; Guo, Zixin; Liu, Lei; Guo, Yuanyuan; Zhang, Ze; Li, Jinlong; Li, Yan; Zhou, Yanwen; Liang, Ying-Shuang

doi:10.1016/j.surfcoat.2020.126689

Cited by 29 publications

(14 citation statements)

References 35 publications

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“…While nitride-based phases provide resistance to corrosion up to a certain amount, they accelerate corrosion above a certain amount. The reason for this is explained in the section on microstructural investigations of the corroded surfaces below [20,21]. The SEM micrographs of some corroded surfaces are presented in Figure 11.…”

Section: Corrosion Behavior Of the Samplesmentioning

confidence: 96%

“…Guo et al [20], who observed the formation of a modified layer, reported that rapid heating and solidification promoted heavy plastic deformation, which caused the formation of the dislocation cells by pulse plasma treatment. They stated that the formation of the nano-austenite structure might be attributed to the dissolution of the initial carbide particles and the subsequent stabilization of the γ-phase due to the increased carbon concentration.…”

Section: Hardness Of the Samplesmentioning

confidence: 99%

“…When started by pulse treatment, a very rapid melt and solidification occur on the surface layer of samples. It is found that the pulse plasma process may lead to metastable structure in coating resulting from fast crystallization of plasma transferred material (i.e., "solute trapping" effect [20,21]). Also, the high rates of ions can accelerate the formation of microcrystalline surface layers.…”

Section: Introductionmentioning

confidence: 99%

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The effect of process parameters on microstructure and corrosion behavior of AISI 4140 steel modified by pulse plasma treatment

Özbek

Demirkıran

2022

J. Electrochem. Sci. Eng.

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The pulse plasma system is a surface modification method applied to steel samples. In the present study, the effect of the nozzle distance and pulse number parameters were investigated on the modification process. AISI 4140 steel was preferred as the substrate for modification. In this system, the battery capacity and voltage were constant, and, were selected as 800 mF and 3000 V, respectively. The AISI 4140 steel samples were modified by applying 5, 10, and 15 pulses with 40, 50 and 60 mm nozzle distance. The molybdenum consumable electrode was used during the process. The modified surfaces were examined by optical and scanning electron microscope (SEM) and analyzed by X-ray diffractometer (XRD). Vickers microhardness on the cross-section surface of the samples was measured under a load of 50 g for 15 s. Finally, the specimens were exposed to corrosion in 0.5 M NaCl solution. Corrosion tests were realized using the potentiodynamic polarization method. A modified layer on the steel was determined to consist of two layers, the compound layer and the diffusion layer. It was observed that the structure and thickness of the modified layer affect by pulse number and nozzle distance. New phases such as Fe2N, FeN, MoN, and γ-Fe in the modified layer have occurred. The hardness value of the treated sample has risen about 4-5 times than the untreated, depending on applied process parameters. In general, the pulse plasma treatment has improved the corrosion resistance of treated samples. It was observed that while intergranular corrosion has formed on the unmodified surface, pitting corrosion has appeared on the unmodified surfaces.

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Section: Corrosion Behavior Of the Samplesmentioning

confidence: 96%

Section: Hardness Of the Samplesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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The effect of process parameters on microstructure and corrosion behavior of AISI 4140 steel modified by pulse plasma treatment

Özbek

Demirkıran

2022

J. Electrochem. Sci. Eng.

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“…Low-temperature plasma nitriding and carburizing at temperatures less than 450 • C for austenitic stainless steels can improve their wear resistance. Rather than producing a nitride or carbide, this treatment produces supersaturated solid solution of nitrogen or carbon in the face-centered cubic lattice, which is known as the S-phase (or the expanded austenite) [27][28][29][30][31][32][33]. Accordingly, the corrosion resistance does not degrade because the ability to form a passive film is maintained after plasma treatment [34,35].…”

Section: Introductionmentioning

confidence: 99%

Formation and Properties of Nitrocarburizing S-Phase on AISI 316L Stainless Steel-Based WC Composite Layers by Low-Temperature Plasma Nitriding

Adachi

Yamaguchi

Ueda

2021

Metals

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Stainless steel-based WC composite layers fabricated by a laser cladding technique, have strong mechanical strength. However, the wear resistance of WC composite layers is not sufficient for use in severe friction and wear environments, and the corrosion resistance is significantly reduced by the formation of secondary carbides. Low-temperature plasma nitriding and carburizing of austenitic stainless steels, treated at temperatures of less than 450 °C, can produce a supersaturated solid solution of nitrogen or carbon, known as the S-phase. The combined treatment of nitriding and carburizing can form a nitrocarburizing S-phase, which is characterized by a thick layer and superior cross-sectional hardness distribution. During the laser cladding process, free carbon was produced by the decomposition of WC particles. To achieve excellent wear and corrosion resistance, we attempted to use this free carbon to form a nitrocarburizing S-phase on AISI 316 L stainless steel-based WC composite layers by plasma nitriding alone. As a result, the thick nitrocarburizing S-phase was formed. The Vickers hardness of the S-phase ranged from 1200 to 1400 HV, and the hardness depth distribution became smoother. The corrosion resistance was also improved through increasing the pitting resistance equivalent numbers due to the nitrogen that dissolved in the AISI 316 L steel matrix.

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“…(e) H300 x300 (f) H300 x3000 ยของ Farghali & Aizawa, 2018;Huang et al, 2021;Keddam et al, 2005;Nascimento et al, 2009;Paa-rai, 2005…”

mentioning

confidence: 99%

Surface Hardening of SKD61 Steel using Low-Temperature Plasma Nitriding

Kaewnisai¹,

แก้วนิสัย²,

Chingsungnoen³

et al. 2021

j.appsci

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In this research, a nitride layer on tool steel was synthesized using a plasma-assisted nitriding process at low temperatures. Before nitriding, the SKD61 tool steel was cleaned with a hydrogen plasma for half an hour. Then, it was heated in a vacuum with 450 o C for half an hour and followed by plasma nitriding for 4 hours. The nitrogen flow rate was kept at 1000 sccm and mixed with the hydrogen as a different flow rate of 0, 300, and 500 sccm. The operating pressure was held at 149 Pa. The plasma was generated using a 10 kHz power supply with an average power of 53 W. The optical emission spectra during the plasma nitriding process were analyzed. The atomic nitrogen species were detected at the wavelengths of 427.33 and 585.57 nm. The atomic hydrogens at the wavelengths of 434.05, 486.14, and 656.28 nm also were founded. The energy-dispersive X-ray spectroscopy was used for the elemental analysis of a sample. The atomic nitrogen concentration decrease with the increase of hydrogen flow rate. The structural property of the nitrided specimens was examined using the X-ray diffraction technique. The -Fe 3 N phase was found corresponding to the 2 of 41.17, and the -Fe 4 N phase was also detected at 47.97 and 70.2. Moreover, the CrN phase arising from the precipitation was identified at 63.30. The thickness of the nitrided layer was estimated from the SEM image. It appears that the nitrogen can diffuse into the specimens up to 184, 93, and 77 m. The Vicker hardness of the nitrided samples was increased from 5.430.63 GPa to 11.361.20, 12.170.35, and 7.420.62 GPa that is corresponding to the hydrogen flow rate of 0, 300, and 500 sccm, respectively.

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Structure and corrosion behavior of ultra-thick nitrided layer produced by plasma nitriding of austenitic stainless steel

Cited by 29 publications

References 35 publications

The effect of process parameters on microstructure and corrosion behavior of AISI 4140 steel modified by pulse plasma treatment

The effect of process parameters on microstructure and corrosion behavior of AISI 4140 steel modified by pulse plasma treatment

Formation and Properties of Nitrocarburizing S-Phase on AISI 316L Stainless Steel-Based WC Composite Layers by Low-Temperature Plasma Nitriding

Surface Hardening of SKD61 Steel using Low-Temperature Plasma Nitriding

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