Microstructure and mechanical properties of the modified layer obtained by low temperature plasma nitriding of nanocrystallized 18Ni maraging steel

Yan, Mufu; Wu, Yipeng; Liu, Ruiliang; Yang, Maohua; Tang, Lina

doi:10.1016/j.matdes.2012.11.007

Cited by 17 publications

(4 citation statements)

References 17 publications

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“…The size of these phases was generally limited to 100 nm, so they can be referred to as nanophases. Yan et al [29,30] obtained similar results with plasma nitriding, and found that the existence of the nano-phase helps to improve the hardness and wear resistance of the nitriding layer. Furthermore, these phases are consistent with the XRD results in Figure 3b.…”

Section: Element Distribution In Modified Layer and Eds Energy Spectr...mentioning

confidence: 76%

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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Section: Element Distribution In Modified Layer and Eds Energy Spectr...mentioning

confidence: 76%

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

et al. 2021

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“…In this case, the relative good corrosion resistance of the specimen Q 1150 -N derives mainly from the existence of the stable phase and more proportion of the γ ′-Fe 4 N phase. 19…”

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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“…Therefore, it is widely used in steel components, such as automotive gears, crankshafts, molds, and tools. Plasma nitriding (PN) is a popular nitriding technology that is environment-friendly, providing efficient surface modification [10][11][12][13] to improve the wear resistance of components by forming a nitrided layer [14][15][16][17][18]. Generally, a nitrided layer is composed of a top compound layer and a bottom diffusion layer [19].…”

Section: Introductionmentioning

confidence: 99%

Novel Effect of Post-Oxidation on the Comprehensive Performance of Plasma Nitriding Layer

Ni,

Ma,

Wei

et al. 2024

Coatings

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In order to enhance the comprehensive performance of plasma nitrided heavy load components used in corrosive environments, post-oxidation was conducted under different conditions after plasma nitriding 42CrMo4 steel at 500 °C for 5 h. The results show that an oxide film composed of Fe3O4 and Fe2O3 was formed above the compound layer, resulting in a significant increase in corrosion resistance; the self-corrosion potential was greatly increased from −658.72 mV to −429.23 mV. Meanwhile, it needs to be emphasized that the characteristics of the plasma nitriding layer could be effectively adjusted as expected by post-oxidation. The compound layer thickness decreased from 9.41 μm to 3.62 μm by post-oxidation at 400 °C for 2 h, while the thickness of the effective hardening layer increased from 300 μm to 378 μm. Due to the expected change in the characteristics of the plasma nitriding layer, post-oxidation could simultaneously improve the toughness, hardness, and wear resistance of the samples; the brittleness level decreased from Grade 4 to Grade 1; the surface hardness increased from 765 HV0.05 to 825 HV0.05; and the wear rate decreased from 3 × 10−5 g·m−1·N−1 to 1.19 × 10−5 g·m−1·N−1, illustrating that the wear resistance was greatly improved.

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Microstructure and mechanical properties of the modified layer obtained by low temperature plasma nitriding of nanocrystallized 18Ni maraging steel

Cited by 17 publications

References 17 publications

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

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

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

Novel Effect of Post-Oxidation on the Comprehensive Performance of Plasma Nitriding Layer

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