The Role of the Material of Active Screen During the Plasma Nitriding Process

Kovács, Dorina; Szabó, Annamária; Kemény, Alexandra

doi:10.33924/amt-2020-01-04

Cited by 2 publications

(4 citation statements)

References 17 publications

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“…In addition, the deposits layer acts as a protective film against corrosion. 22) As shown in the polarization curves in Fig. 11, the current density is lower in the potential range of ¹0.6 V to ¹0.2 V, and the corrosion resistance of ASPN (Ni) is higher than that of ASPN (SPCC).…”

Section: Discussionmentioning

confidence: 88%

“…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%

“…8(b), a region with a thin compound layer is observed, which is likely the origin of the corrosion. 21,22) the absence of a nitrided layer despite the formation of a Ni deposit layer may be due to the absence of Ni nitride deposits during processing.…”

Section: Discussionmentioning

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: Discussionmentioning

confidence: 88%

Section: Resultsmentioning

confidence: 99%

Section: Discussionmentioning

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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Thickening of S-Phase and Sα-Phase of Various Stainless Steels Treated by Low Temperature Plasma Nitriding Using Screen

Hamashima

Nishimoto

2022

Mater. Trans.

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This study aimed to observe the thickening of the S-phase and S¡-phase of various stainless steels subjected to low-temperature direct current plasma nitriding using screen (S-DCPN). Austenitic stainless steel SUS304, ferritic stainless steel SUS430, and duplex stainless steel SUS329J4L were treated using two different screens for comparison, namely, a Ni screen and a steel plate cold commercial (SPCC) screen. Plasma nitriding was performed at 673 K for 300 min under a 75% N 2 + 25% H 2 atmosphere at 100 Pa pressure of the mixed gas. After nitriding treatment, the samples were examined using X-ray diffraction (XRD) and glow discharge optical emission spectrometry (GD-OES), and their cross-sectional microstructure and surface microstructure were examined using an electron probe micro analyzer (EPMA). Nitrided samples were also subjected to Vickers hardness and pitting corrosion tests. Examination of the SUS304 samples revealed thickening of its S-phase and higher surface hardness and pitting corrosion resistance when nitriding was done with the Ni screen. This was due to excess nitrogen diffusion into the sample due to presence of the Ni screen than with the SPCC screen. In the SUS430 samples, thickening of the S¡-phase was not be observed. When the Ni screen was used during nitriding, higher surface hardness and less pitting corrosion resistance of sample were observed, along with enhanced nitrogen diffusion than the SPCC screen was used. In the SUS329J4L samples, upon nitriding with Ni screen, thickening of the S-phase was observed and surface hardness and pitting corrosion resistance of the sample were higher, which was attributed to the enhanced nitrogen diffusion into the sample than when nitriding with the SPCC screen.

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The Role of the Material of Active Screen During the Plasma Nitriding Process

Cited by 2 publications

References 17 publications

Effects of Nickel Screen on Active Screen Plasma Nitriding

Effects of Nickel Screen on Active Screen Plasma Nitriding

Thickening of S-Phase and Sα-Phase of Various Stainless Steels Treated by Low Temperature Plasma Nitriding Using Screen

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