Martensitic stainless steel modified by plasma nitrocarburizing at conventional temperature with and without rare earths addition

Yan, Mufu; Liu, Ruiliang

doi:10.1016/j.surfcoat.2010.06.056

Cited by 26 publications

(4 citation statements)

References 25 publications

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“…3 b ) are mainly composed of γ ′-Fe 4 N, martensite ( α ′-Fe) and nitrogen expended martensite ( ), but there is still a little M 6 C phase in the surface layer of the specimen Q 980 -N. The formed phase is due to the supersaturated nitrogen in the body centred cubic (bcc) martensite lattice. 17,18 The inset of Fig. 3 b shows that the main diffraction peak is split into (101) and α ′-Fe (110) lines.…”

Section: Resultsmentioning

confidence: 99%

Insights into plasma nitriding behaviour of M50NiL steel with different initial microstructures

Wang

Yan

Zhang

et al. 2014

Materials Science and Technology

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Annealed and quenched M50NiL steel specimens were plasma nitrided at 460°C for 4 h under a mixture gaseous supply of 0·05N2+0·4H2 L min−1 to investigate the effects of the substrate microstructure on the features of nitrided layer, such as microstructure, microhardness and wear resistance. The results show that the nitrided layer is mainly consisted of α′-Fe, γ′-Fe4N and α′N (nitrogen expanded martensite) phases. The surface hardness is significantly enhanced. For the quenched specimens, the nitrided depth decreases with increasing quenched temperature. Compared to the quenched specimens, the nitrided depth of the annealed specimen is thicker under the same nitriding condition. The mechanism may be the variation in the amounts of interstitial carbon atoms and substitution alloying elements in the lattice, and the compressive residual stresses in the substrate. It is also demonstrated that the wear resistance for both the annealed and the quenched specimens can be significantly improved by plasma nitriding treatment.

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Section: Resultsmentioning

confidence: 99%

Insights into plasma nitriding behaviour of M50NiL steel with different initial microstructures

Wang

Yan

Zhang

et al. 2014

Materials Science and Technology

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“…At the same time, the involvement of RE elements causes the nitrogen to diffuse deeper into the nitrided layer. Yan et al [16,17] showed that rare earth elements induced nitriding and observed similar catalytic effects; they also studied the general catalytic effect of rare earth elements on the nitriding process of various steels, including stainless steel [18,19] and alloy steel [20][21][22].…”

Section: Introductionmentioning

confidence: 98%

Acceleration of Plasma Nitriding at 550 °C with Rare Earth on the Surface of 38CrMoAl Steel

et al. 2021

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In order to explore the effect of the addition of rare earth (RE) to a steel microstructure and the consequent performance of a nitrided layer, plasma nitriding was carried out on 38CrMoAl steel in an atmosphere of NH3 at 550 °C for 4, 8, and 12 h. The modified layers were characterized using an optical microscope (OM), a microhardness tester, X-ray diffraction (XRD), a scanning electron microscope (SEM), a transmission electron microscope (TEM), and an electrochemical workstation. After 12 h of nitriding without RE, the modified layer thickness was 355.90 μm, the weight gain was 3.75 mg/cm2, and the surface hardness was 882.5 HV0.05. After 12 h of RE nitriding, the thickness of the modified layer was 390.8 μm, the weight gain was 3.87 mg/cm2, and the surface hardness was 1027 HV0.05. Compared with nitriding without RE, the ε-Fe2-3N diffraction peak was enhanced in the RE nitriding layer. After 12 h of RE nitriding, La, LaFeO3, and a trace amount of Fe2O3 appeared. The corrosion rate of the modified layer was at its lowest (15.089 × 10−2 mm/a), as was the current density (1.282 × 10−5 A/cm2); therefore, the corrosion resistance improved.

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“…However, the relatively low chromium con-tent (~13 wt.%) in solutions containing chlorine results in lower corrosion resistance than other stainless steels [5]. Some surface modification methods to raise the corrosion resistance of 2Cr13 steels have been applied, including nitriding, nitrocarburizing, laser transformation hardening, plasma immersion ion implantation, physical vapor deposition, and the other processing technologies [6][7][8][9][10][11][12][13][14][15].…”

Section: Introductionmentioning

confidence: 99%

Effect of electric potentials on high‐temperature plasma nitriding of 2Cr13 stainless steel with active screen assisted

Shao

Wang

Zhang

et al. 2022

Materialwissenschaft Werkst

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The influence of electric potentials on the characteristics of modified layers with plasma nitriding of 2Cr13 stainless steel at a high temperature was investigated. Three active screens were placed on the cathodic plate. Three groups of 2Cr13 stainless steel samples were set with cathodic, anodic, and floating potentials. Samples were nitrided at 500 °C for 5 h in an ammonia atmosphere. The treated samples were analyzed using x‐ray diffraction, scanning electron microscopy with energy dispersive x‐ray spectroscopy, surface roughness tester, and atomic force microscopy. It is proved that nitriding treatments can be suitably carried out at three electric potentials, but the corresponding modified layers take on different microstructure, morphology, and hardness behaviors. It found that the three nitrided samples are mainly composed of the ϵ−Fe2‐3N and γ’−Fe4N phases. The order of thicknesses of the nitrided layers is: floating < anodic < cathodic potential. The results also demonstrated that electric potentials play essential roles in the corrosion resistance and tribological properties in plasma nitriding treatment. Because there is no visible precipitation of chromium nitride in the modified layer, the corrosion resistance of the floating nitrided sample is better than that of the other two samples.

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Martensitic stainless steel modified by plasma nitrocarburizing at conventional temperature with and without rare earths addition

Cited by 26 publications

References 25 publications

Insights into plasma nitriding behaviour of M50NiL steel with different initial microstructures

Insights into plasma nitriding behaviour of M50NiL steel with different initial microstructures

Acceleration of Plasma Nitriding at 550 °C with Rare Earth on the Surface of 38CrMoAl Steel

Effect of electric potentials on high‐temperature plasma nitriding of 2Cr13 stainless steel with active screen assisted

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