Nitrogen Surface Enrichment of Austenitic Stainless Steel ISO 5832-1: SHTPN vs Low-temperature Plasma Nitriding

Reis, Ricardo Fernando dos; Villanova, Rodrigo Lupinacci; Costa, Kaiuã Dubyna; Durante, Gabriela Costa

doi:10.1590/1516-1439.352014

Cited by 3 publications

(6 citation statements)

References 11 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Even though chromium compounds have not been identified by XRD, darker areas can be seen in the micrographs shown in Figure 3. These darker areas surrounding grain boundaries (see arrows in the Figures) were observed for all treatment conditions, and have already been reported in previous work 9 . They correspond to regions where etching was more intense, which is consistent with the presence of chromium precipitates (CrN or Cr 2 N) in these areas 9 .…”

Section: Resultssupporting

confidence: 89%

“…These darker areas surrounding grain boundaries (see arrows in the Figures) were observed for all treatment conditions, and have already been reported in previous work 9 . They correspond to regions where etching was more intense, which is consistent with the presence of chromium precipitates (CrN or Cr 2 N) in these areas 9 . It is believed that the amount and/or size of such precipitates are below the detection limits of the XRD apparatus.…”

Section: Resultssupporting

confidence: 89%

“…Hence, the use of plasma nitriding in applications where corrosion resistance is an issue is limited to processes made at low temperature, where the formation of S-phase (ɣ N ) is the only transformation that occurs at the material surface 1,14,15 . However, nitrided layers obtained at these conditions are, in general, very thin 9 . Some authors 16,17 also observed that the high hardness of the layer, caused by the high compression stress level, may lead to nucleation of cracks.…”

Section: Introductionmentioning

confidence: 96%

“…The high corrosion resistance of austenitic stainless steels makes them widely used in the industry. However, in order to further increase its applicability by improving localized corrosion resistance and tribological properties, some techniques regarding introduction of nitrogen in solid solution have been employed [1][2][3][4][5][6][7][8][9] . Among those techniques, plasma nitriding has been largely used.…”

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Plasma Nitriding of ISO 5832-1 Stainless Steel with Intermittent Nitrogen Flow at 450°C

et al. 2020

Self Cite

View full text Add to dashboard Cite

ISO 5832-1 stainless steel specimens were plasma nitrided at different nitrogen potentials. The main goal was to obtain the S-phase with different nitrogen concentrations and free of chromium-based precipitates. The control of nitrogen potential was made by pulsing the gas at predetermined times: 10/10, 05/15, 02/18, and 01/19, where the numbers represent the time in minutes that the nitrogen flow was kept on/off, respectively. For all pulsing conditions, the nitriding was carried out at 450 °C for 2 hours. After nitriding, specimens were characterized by means of optical (OM) and electron microscopy (SEM), energy-dispersive spectroscopy (EDS), X-ray diffraction (XRD) and microhardness. Results show that the nitrided layer thickness decreases with decreasing times of nitrogen pulse, and that lower times of nitrogen flow lead to lower precipitation of chromium nitrides. It can be thus concluded that the use of intermittent nitrogen flow is an alternative to control the nitrided layer in terms of thickness, hardness, and the amount of nitrogen present in phase ɣ N (S-phase).

show abstract

Section: Resultssupporting

confidence: 89%

Section: Resultssupporting

confidence: 89%

Section: Introductionmentioning

confidence: 96%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Plasma Nitriding of ISO 5832-1 Stainless Steel with Intermittent Nitrogen Flow at 450°C

et al. 2020

Self Cite

View full text Add to dashboard Cite

show abstract

“…Additionally, due to the compressive stresses introduced in the treated layer, fatigue life is also increased, and compressive residual stresses between 2 and 3 GPa are commonly reported (information compiled from refs. [10,11,13,[17][18][19][20][21][22][23].…”

Section: Austenitic Stainless Steelsmentioning

confidence: 99%

Low-temperature Thermochemical Treatments of Stainless Steels – An Introduction

Cardoso¹,

Mafra²,

Brunatto³

2016

Plasma Science and Technology - Progress in Physical States and Chemical Reactions

View full text Add to dashboard Cite

Plasma technology used to perform thermochemical treatments is well established for the majority of steels, but it is not the case for the different stainless steel classes. Thus, important scientific and technological achievements can be expected in the coming years regarding plasma-assisted thermochemical treatment of such steels. The metallurgical aspects as well as the application cost-efficiency of stainless steels impose specific requirements for the thermochemical treatment, such as easy native chromium-rich oxide layer removal and surface activation at low temperature, which do not appear for other steel classes plain, low-alloy, and tool steels . Thus, due to the highly reactive physicochemical environment created by the plasma, plasma-assisted technology presents advantages over other conventional technologies like those performed in gas or liquid environments. Low temperature is needed to avoid the reduction of corrosion resistance of stainless steels, by suppressing chromium carbide/nitride precipitation, and, in this case, good surface properties are achieved by the formation of treated layers containing metastable phases. Such attributes make the low-temperature plasma thermochemical treatments of stainless steels an important R&D field in the domain of plasma technology and surface treatments, and the goal of this chapter is to introduce the reader to this important topic.

show abstract

Enhancement of Pitting Corrosion Resistance of Austenitic Stainless Steel Through Deposition of Amorphous/Nanocrystalline Oxy-nitrided Phases by Active Screen Plasma Treatment

Qiu

et al. 2018

Mat. Res.

View full text Add to dashboard Cite

In this research, AISI 304 austenitic stainless steels were efficient treatment using active screen plasma oxy-nitriding technique. The modified layers were characterized by X-ray photoelectron spectroscopy, X-ray diffraction, scanning electron microscopy, transmission electron microscopes, and atomic force microscopy. In addition, the pitting corrosion resistances of untreated and oxy-nitrided samples were analyzed by polarization method in 3.5 wt.% NaCl solution. The results showed that a duplex-layer consisting of a deposition layer and a diffusion layer (including CrN+α phase and nitrogen expanded austenite phase) was generated. Special concern has been given to the formation of an amorphous top layer for the deposition of nano sized oxy-nitrides. It believed that the deposition layer of oxy-nitrides formed on steel surface during active screen plasma oxy-nitriding that lead to improved corrosion resistance of AISI 304 austenitic stainless steel, so that the pitting corrosive attack can be avoided.

show abstract

Nitrogen Surface Enrichment of Austenitic Stainless Steel ISO 5832-1: SHTPN vs Low-temperature Plasma Nitriding

Cited by 3 publications

References 11 publications

Plasma Nitriding of ISO 5832-1 Stainless Steel with Intermittent Nitrogen Flow at 450°C

Plasma Nitriding of ISO 5832-1 Stainless Steel with Intermittent Nitrogen Flow at 450°C

Low-temperature Thermochemical Treatments of Stainless Steels – An Introduction

Enhancement of Pitting Corrosion Resistance of Austenitic Stainless Steel Through Deposition of Amorphous/Nanocrystalline Oxy-nitrided Phases by Active Screen Plasma Treatment

Contact Info

Product

Resources

About