PLASMA NITRIDING OF AISI 5140 LOW ALLOY STEEL ASSISTED WITH HOLLOW CATHODE DISCHARGE AT LOW PRESSURE

2018 ◽  
Vol 25 (04) ◽  
pp. 1850086 ◽  
Author(s):  
ENBO WANG ◽  
HAO YANG ◽  
LIANG WANG
Keyword(s):  
Alloy Steel ◽  
Hollow Cathode ◽  
Plasma Nitriding ◽  
Compound Layer ◽  
Low Pressure ◽  
Optical Microscope ◽  
Hollow Cathode Discharge ◽  
Low Alloy Steel ◽  
X Ray Diffraction ◽  
Diffusion Layers

Plasma nitriding of AISI 5140 low alloy steel was carried at pressures ranging from 100[Formula: see text]Pa–500[Formula: see text]Pa for 4[Formula: see text]h with hollow cathode discharge assistance. The treated samples were characterized by optical microscope, microhardness tester, X-ray diffraction and electrochemical workstation. The results show that the compound layer is about 5[Formula: see text][Formula: see text]m in thickness and the depth of surface hardening layer is about 240[Formula: see text][Formula: see text]m for the sample nitrided at 100[Formula: see text]Pa for 4[Formula: see text]h. The hardness value of nitrided surface is about 830[Formula: see text]HV[Formula: see text], which is about 2.9 times higher than that (290[Formula: see text]HV[Formula: see text]) of the substrate. There is no obvious difference in the thickness of compound and diffusion layers, surface microhardness and phase composition of nitrided layers in comparison with that of samples nitrided at pressure 300 and 500[Formula: see text]Pa used by conventional plasma nitriding. But plasma nitriding with low pressure can effectively reduce the assumption of nitriding gas and amount of exhausted emission.

Mechanical Properties of Layers Obtained by DC-Pulsed Plasma Nitriding on a Low-Alloy Steel (AISI 4140)

2009 ◽  
Vol 6 (S1) ◽  
pp. S314-S320 ◽  
Author(s):  
Luciano Dutrey ◽  
Evangelina De Las Heras ◽  
Hernán G. Svoboda ◽  
Pablo A. Corengia
Keyword(s):  
Mechanical Properties ◽  
Alloy Steel ◽  
Plasma Nitriding ◽  
Pulsed Plasma ◽  
Low Alloy Steel ◽  
Aisi 4140 ◽  
Steel Aisi

EFFECT OF NITROGEN AMOUNT ON TRIBOLOGICAL BEHAVIOR OF PLASMA NITRIDED 31CrMoV9 STEEL

2019 ◽  
Vol 26 (07) ◽  
pp. 1850217 ◽  
Author(s):  
O. ÇOMAKLI ◽  
A. F. YETIM ◽  
B. KARACA ◽  
A. ÇELIK
Keyword(s):  
Wear Resistance ◽  
Tribological Behavior ◽  
Wear Behavior ◽  
Plasma Nitriding ◽  
Surface Hardness ◽  
Compound Layer ◽  
Gas Mixture ◽  
X Ray Diffraction ◽  
X Ray ◽  
Pin On Disk

The 31CrMoV9 steels were plasma nitrided under different gas mixture ratios to investigate an influence of nitrogen amount on wear behavior. The structure, mechanical and tribological behavior of untreated and nitrided 31CrMoV9 steels were analyzed with X-ray diffraction (XRD), scanning electron microscopy (SEM), energy dispersive X-ray spectroscopy (EDS), microhardness device, 3D profilometer and pin-on-disk wear tester. The analysis outcomes displayed that the compound layer consists of nitride phases (Fe2N, Fe3N, Fe4N and CrN). Additionally, the thickness of the compound layers, surface hardness and roughness increased with increasing nitrogen amount in the gas mixture. The highest friction coefficient value was obtained at nitrogen amount of 50%, but the lowest value was seen at nitrogen amount of 6%. It was observed that wear resistance of 31CrMoV9 steel improved after plasma nitriding, and the best wear resistance was also obtained from plasma nitrided sample at the gas mixture of 94% H[Formula: see text]% N2.

Microwave plasma nitriding of a low-alloy steel

2000 ◽  
Vol 18 (6) ◽  
pp. 2715-2721 ◽  
Author(s):  
D. Hovorka ◽  
J. Vlček ◽  
R. Čerstvý ◽  
J. Musil ◽  
P. Bělský ◽  
...  
Keyword(s):  
Alloy Steel ◽  
Microwave Plasma ◽  
Plasma Nitriding ◽  
Low Alloy Steel

Evaluation of the Effect of Different Plasma-Nitriding Parameters on the Properties of Low-Alloy Steel

2017 ◽  
Vol 26 (7) ◽  
pp. 3588-3596 ◽  
Author(s):  
Eva Zdravecká ◽  
Ján Slota ◽  
Pavel Solfronk ◽  
Michaela Kolnerová
Keyword(s):  
Alloy Steel ◽  
Plasma Nitriding ◽  
Low Alloy Steel

Surface Characterization of a Nitrided Low Alloy Steel

2011 ◽  
Vol 312-315 ◽  
pp. 70-75
Author(s):  
Mourad Keddam ◽  
R. Kouba ◽  
Redoune Chegroune ◽  
B. Bouarour
Keyword(s):  
Alloy Steel ◽  
Surface Characterization ◽  
Surface Hardness ◽  
Xrd Analysis ◽  
Compound Layer ◽  
Iron Nitrides ◽  
Low Alloy Steel ◽  
Nitrogen Concentrations ◽  
Nitriding Potential ◽  
Nitride Layers

The 32CrMoV13 low alloy steel was gas nitrided at 550°C, for three time durations (6.5, 13 and 20 h) and under a variable nitriding potential (1, 2.2 and 6 atm-0.5). The generated nitride layers were characterized by SEM observations, XRD and GDOS analyses as well as microhardness testing. The XRD analysis indicates that the compound layer was composed of and iron nitrides and CrN phase. The surface hardness (inside the compound layer) was found to be dependent on the nitriding potential value, its value increases as rises. It was shown by GDOS analysis that the upper and lower nitrogen concentrations at the (compound layer / diffusion zone) interface are approximatively: 4 and 0.88 wt. % N, respectively.

LOW-TEMPERATURE NITRIDING BEHAVIOR OF COMPRESSIVE DEFORMED AISI 316Ti AUSTENITIC STAINLESS STEELS

2019 ◽  
Vol 26 (05) ◽  
pp. 1850188 ◽  
Author(s):  
FATIH KAHRAMAN ◽  
GÖKÇE MEHMET GENÇER ◽  
AYÇA D. KAHRAMAN ◽  
COŞKUN YOLCU ◽  
HAYDAR KAHRAMAN
Keyword(s):  
Low Temperature ◽  
Plasma Nitriding ◽  
Nitrided Layer ◽  
Cold Deformation ◽  
Surface Hardness ◽  
Compound Layer ◽  
Optical Microscope ◽  
Layer Growth ◽  
Nitrogen Diffusion ◽  
Undeformed Sample

The effects of compressive cold deformation under the quasi-static loads on the nitride formation, nitride layer growth and surface hardness properties were researched in this study. Martensite structure did not form in AISI 316Ti stainless steel as a result of quasi-static deformation. Diffusion layer did not form in all nitrided samples. Both the deformed and undeformed samples have only compound layer on the surfaces at the low-temperature nitriding conditions (400∘C, 7[Formula: see text]h). According to the X-ray diffraction (XRD), energy-dispersive spectroscopy (EDS) and electron probe microanalysis (EPMA) results, S-phase and chromium nitride (CrN) were formed in the compound layers of the deformed samples. However, CrN did not form in the compound layer of the undeformed sample. The optical microscope (OM) results showed that the compressive cold deformation increased the nitrogen diffusion rate and led to thicker nitrided layer than the undeformed sample under the same plasma-nitriding conditions. All nitrided layers presented higher microhardness values ([Formula: see text][Formula: see text]HV) when compared with the untreated sample hardness. It was also verified that the deformation amount did not affect significantly the nitrided layer hardness.

scholarly journals Glow discharge plasma nitriding of low alloy steel

2019 ◽  
Vol 19 ◽  
pp. 864-866 ◽  
Author(s):  
K. Ram Mohan Rao ◽  
K. Trinadh ◽  
C. Nouveau
Keyword(s):  
Glow Discharge ◽  
Alloy Steel ◽  
Discharge Plasma ◽  
Plasma Nitriding ◽  
Glow Discharge Plasma ◽  
Low Alloy Steel
Sign in / Sign up

Export Citation Format

Share Document