Investigation of the ASPN process of low alloy steel by using Ni or Cr coated active screens

Kovács, Dorina; Dobránszky, János; Fodor, Tamás; Takáts, Viktor; Bonyár, Attila

doi:10.1016/j.surfcoat.2020.125638

Cited by 17 publications

(9 citation statements)

References 35 publications

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“…Figure 2 shows the XRD results of £ A-Fe 4 N and ¾-Fe 23 N obtained for all the nitrided samples. The diffractions of Ni were detected in ASPN (Ni), which were concluded to be due to Ni deposits from the Ni screen; this result was comparable to the report using a Ni electroplated screen by Kovács et al 21) Figure 3 shows the XRD patterns of the S-DCPN-treated samples, restricted to a diffraction angle range of 42°50°. For S-DCPN (Ni), the diffractions of ¡-Fe, rich deposits layer with a thickness of approximately 0.6 µm was observed (Fig.…”

Section: Resultssupporting

confidence: 85%

“…These results confirm the formation of a nitrided layer in ASPN using the Ni screen, and are different from reports by Kovács et al, which could not confirm a nitrided layer in ASPN using a Ni-electroplated screen. 21,22) Figure 4(a), Fig. 4(b), and Fig.…”

Section: Resultsmentioning

confidence: 99%

“…Kovács et al used a Ni electroplating screen and found that a nitrided layer did not form, although a Ni deposits layer from the screen was formed on the sample surface. 21,22) In contrast, according to a report by Morell-Pacheco et al, a nitrided layer was formed with a Ni deposits layer on a sample surface. 23) As described above, conflicting results for the formation of a nitrided layer were obtained previously, and there are many unclear variables regarding the use of a Ni screen in ASPN.…”

Section: Introductionmentioning

confidence: 95%

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Effects of Nickel Screen on Active Screen Plasma Nitriding

Hamashima

Nishimoto

2022

Mater. Trans.

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Active screen plasma nitriding (ASPN) is a nitriding method that avoids the edge effects and arcing that occur during conventional direct current plasma nitriding (DCPN). Furthermore, applying voltage to a sample during ASPN allows the nitriding rate to be increased (S-DCPN). While steel is the predominant screen material, there are few reports of non-ferrous material screens. Therefore, in this study, we investigated the effect of a Ni screen on ASPN and S-DCPN. Low carbon steel S15C was treated by ASPN and S-DCPN using a Ni screen. A steel plate cold commercial (SPCC) screen was also prepared for comparison. Plasma nitriding was performed at 773 K for 240 min under an atmosphere of 75% N 2 + 25% H 2 at a gas pressure of 200 Pa. After the nitriding treatment, X-ray diffraction (XRD), glow discharge optical emission spectrometry (GD-OES), cross-sectional microstructure observation, surface microstructure observation, Vickers hardness test, and corrosion test were performed. As a result, when the Ni screen was used for S15C steel nitriding, more nitrogen atoms diffused into the sample than that when the SPCC screen was used; furthermore, nickel atoms diffused within the samples treated by both ASPN and S-DCPN using the Ni screen. ASPN-treated samples had less surface hardness and were higher corrosion resistance when prepared using the Ni screen than the SPCC screen. S-DCPN-treated samples had greater surface hardness and were less corrosion resistance when prepared using the Ni screen than the SPCC screen.

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Section: Resultssupporting

confidence: 85%

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 95%

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Effects of Nickel Screen on Active Screen Plasma Nitriding

Hamashima

Nishimoto

2022

Mater. Trans.

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“…Among the processing techniques for coatings deposition we can highlight the cathodic cage plasma deposition, consisting in the combination of the following mechanisms: sputtering, which occurs in the cathodic cage and allows the deposition of several coatings depending on the material of the cage; physical adsorption, from the combination with plasma specimens, presenting as an advantage the possibility of using the technique for both oxide and nitride deposition; deposition; desorption and diffusion [11][12][13] . This technique is widely disseminated in the literature for samples and cathodic cages of various materials 11,[14][15][16][17][18][19] , however, there are no reports of the use of Hastelloy's cage, a nickel alloy characterized by high molybdenum and chromium contents, which together with nickel are responsible for their high pitting corrosion resistance 20 , thus, it is considered that the use of Hastelloy as a cathodic target can contribute to the synthesis of a coating with high corrosion resistance.…”

Section: Introductionmentioning

confidence: 99%

Influence of Hastelloy’s Cathodic Cage Plasma Deposition on Corrosion Resistance of AISI 304 Stainless Steel and of AISI D6 Tool Steel

et al. 2021

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AISI D6 tool steel and AISI 304 stainless steel are among the most widely used material in the industry. However, this application field can still be expanded through the coatings deposition. In this regard, the objective of this work was to evaluate the impact of coatings application by cathodic cage technique using Hastelloy's cathodic cage, on corrosion resistance of these steels. Two treatment temperatures were compared. The samples were characterized by Optical Microscopy, Scanning Electron Microscopy, Energy Dispersive Spectroscopy, X-Ray Diffraction with the application of the Rietveld routine and corrosion test. The results showed the formation of multiphase layers that contributed to corrosion potentials reduction for treatments at 400 °C, being more effective when applied on AISI D6. It was observed that the corrosion resistance is influenced by the temperature, which was attributed to the precipitation of chromium nitride and iron oxide at 450 ºC.

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“…Active screen plasma nitriding technology (ASPN) or cathodic cage plasma nitriding (CCPN) has been extensively studied by many researchers in the past decade [11][12][13][14][15][16] . As the cathode of the metal screen is bombarded by ions, iron particles are continuously sputtered and deposited on the workpiece, and nitrogen atoms diffuse into the inner part of the suspended workpiece to avoid the above problems during CPN treatment.…”

Section: Introductionmentioning

confidence: 99%

Mechanical and Wear Properties of 42CrMo Steel by Plasma Nitriding assisted Hollow Cathode Ion Source

et al. 2021

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Plasma nitriding is a plasma-activated thermochemical method widely used to increase the fatigue strength, hardness and wear resistance of low-alloy steels. In this work, a new structure consisting of a hollow cathode metal plate can produce a hollow cathode discharge and heat the workpiece by radiation. This principle is used to perform hollow cathode source plasma nitriding (HCSPN). Herein, 42CrMo steels were treated by conventional plasma nitriding (CPN) and HCSPN treatments. The 42CrMo steels were nitrided at 525 °C for 6 h in NH 3 atmosphere. The mechanical and dry wear properties were measured by nano-indentation, Vickers micro-indentation and ball-on-disk tribometer, respectively. The H 3 /E ⁎2 ratio was 0.0274 GPa (H=11.51 GPa and E ⁎ =235.84 GPa) for the CPN sample and 0.0276 GPa (H=10.87 GPa and E ⁎ =215.54 GPa) for the HCSPN sample. Compared with the untreated 42CrMn steel, all the nitrided samples possess increased fracture toughness. Because the workpiece was not used as a discharge cathode, this HCSPN treatment overcame the disadvantages of the conventional CPN treatment. Additionally, results showed that the surface of the HCSPN sample was smoother than that of the CPN sample, and its tribological performance was better.

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Investigation of the ASPN process of low alloy steel by using Ni or Cr coated active screens

Cited by 17 publications

References 35 publications

Effects of Nickel Screen on Active Screen Plasma Nitriding

Effects of Nickel Screen on Active Screen Plasma Nitriding

Influence of Hastelloy’s Cathodic Cage Plasma Deposition on Corrosion Resistance of AISI 304 Stainless Steel and of AISI D6 Tool Steel

Mechanical and Wear Properties of 42CrMo Steel by Plasma Nitriding assisted Hollow Cathode Ion Source

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