Investigation of compound layer formed during ion nitriding of AISI 4140 steel

In the present research, AISI 4140 steel was nitrided in salt bath to study and analyze the behaviour of the surface roughness. The Structural surface characterization behaviour of the nitrided steel was compared to the behaviour of the same steel which was untreated. The nitriding process was implemented in the salt bath component at ten different times (from 1 h to 10 h) when the temperature was constant at (580ºC). The influence of nitriding treatment on structural properties of the material was studied by scanning electron microscopy (SEM), microhardness tester and surface profilometer. It was found that salt bath nitriding was effective in improving the surface properties behaviour of this steel, Experimental results showed that the nitrides ε-Fe2-3(N,C) and γ’-Fe4(N,C) present in the compound layer increase the microhardness (406–502 HV0.3),The initial surface roughness values of nitrided samples were higher than those of unnitrided specimens, It also observed that the Increasing the nitriding time increases the surface roughness parameters (Ra, Rq and Rz).

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Wear Properties of Plasma Nitrided Steel in Dry Sliding Conditions

Journal of Tribology ◽

10.1115/1.2834138 ◽

1999 ◽

Vol 121 (4) ◽

pp. 802-807 ◽

Cited By ~ 4

Author(s):

B. Podgornik ◽

J. Vizˇintin

Keyword(s):

Tribological Properties ◽

Plasma Nitriding ◽

Testing Machine ◽

Compound Layer ◽

Wear Testing ◽

Pulse Plasma ◽

Dry Sliding ◽

Wear Properties ◽

Aisi 4140 Steel ◽

Aisi 4140

In our study, we investigated the wear, mechanical and tribological properties of plasma and pulse plasma nitrided AISI 4140 steel compared to hardened steel. Contact surfaces of the samples were fully characterized using metallographic, SEM microscopic, microhardness, and profilometric techniques, before and after wear testing. Wear tests were performed on a pin-on-disk wear testing machine in which nitrided pins were mated to hardened ball bearing steel disks under dry sliding conditions. Results show only slight improvement of the tribological properties of AISI 4140 steel after plasma and pulse plasma nitriding compared to hardening. However, improvements become more evident when testing conditions become more severe. It was also found that compound layer should be removed from the nitrided surface to avoid impairment of the tribological properties by fracture of hard and brittle compound layer followed by the formation of hard abrasive particles.

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EFFECT OF TIME ON THE COMPOUND LAYER FORMED DURING SALT BATH NITRIDING OF AISI 4140 STEEL

Acta Metallurgica Slovaca ◽

10.12776/ams.v24i4.1111 ◽

2018 ◽

Vol 24 (4) ◽

pp. 280

Author(s):

GHELLOUDJ Elhadj ◽

HANNACHI Mohamed Tahar ◽

DJEBAILI Hamid

Keyword(s):

Surface Hardness ◽

Compound Layer ◽

Salt Bath ◽

X Ray Diffraction ◽

Aisi 4140 Steel ◽

X Ray ◽

Aisi 4140 ◽

Salt Bath Nitriding ◽

Scanning Electron ◽

Microhardness Tester

<p class="AMSmaintext">This research was carried out to study the effect of time on the compound layer of AISI 4140 steel in salt bath nitriding. The nitriding process were implemented on AISI 4140 steel in salt bath component for different times (from 1 h to 10 h) at 580 °C. Samples of AISI 4140 steel were treated and characterized (at surface and core of samples) through the following technique: optical microscopy, scanning electron microscopy, X-ray diffraction (XRD) and microhardness tester. Shows that thick compound layers are formed during continuous salt bath nitriding. The thickness of the compound layer and surface hardness increases with increasing time.</p>

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Modeling of external forced flow and boiling film effects on heat transfer of AISI 4140 steel horizontal rod during direct quenching process

Heat Transfer Research ◽

10.1615/heattransres.2011002530 ◽

2011 ◽

Author(s):

Amirhossein Meysami

Keyword(s):

Heat Transfer ◽

Forced Flow ◽

Aisi 4140 Steel ◽

Direct Quenching ◽

Aisi 4140 ◽

Quenching Process

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Weld quality and productivity of AISI 4140 steel welded by unpulsed and pulsed GMAW

Materials Testing ◽

10.3139/120.111136 ◽

2018 ◽

Vol 60 (2) ◽

pp. 149-155 ◽

Cited By ~ 1

Author(s):

Turhan Kursun ◽

Tanju Teker

Keyword(s):

Weld Quality ◽

Aisi 4140 Steel ◽

Aisi 4140

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The corrosion behaviour of manganese phosphate coatings applied to AISI 4140 steel subjected to different heat treatments

Surface and Coatings Technology ◽

10.1016/j.surfcoat.2004.10.004 ◽

2006 ◽

Vol 200 (8) ◽

pp. 2711-2717 ◽

Cited By ~ 40

Author(s):

Yasar Totik

Keyword(s):

Corrosion Behaviour ◽

Heat Treatments ◽

Aisi 4140 Steel ◽

Manganese Phosphate ◽

Phosphate Coatings ◽

Aisi 4140

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MODELING AND INVESTIGATION OF THE WEAR RESISTANCE OF SALT BATH NITRIDED AISI 4140 VIA ANN

Surface Review and Letters ◽

10.1142/s0218625x13500339 ◽

2013 ◽

Vol 20 (03n04) ◽

pp. 1350033 ◽

Cited By ~ 1

Author(s):

ŞERAFETTIN EKINCI ◽

AHMET AKDEMIR ◽

HUMAR KAHRAMANLI

Keyword(s):

Wear Resistance ◽

Friction Coefficient ◽

Surface Characterization ◽

Wear Behavior ◽

Surface Hardness ◽

Salt Bath ◽

Back Propagation Algorithm ◽

Aisi 4140 Steel ◽

Aisi 4140 ◽

Sliding Distance

Nitriding is usually used to improve the surface properties of steel materials. In this way, the wear resistance of steels is improved. We conducted a series of studies in order to investigate the microstructural, mechanical and tribological properties of salt bath nitrided AISI 4140 steel. The present study has two parts. For the first phase, the tribological behavior of the AISI 4140 steel which was nitrided in sulfinuz salt bath (SBN) was compared to the behavior of the same steel which was untreated. After surface characterization using metallography, microhardness and sliding wear tests were performed on a block-on-cylinder machine in which carbonized AISI 52100 steel discs were used as the counter face. For the examined AISI 4140 steel samples with and without surface treatment, the evolution of both the friction coefficient and of the wear behavior were determined under various loads, at different sliding velocities and a total sliding distance of 1000 m. The test results showed that wear resistance increased with the nitriding process, friction coefficient decreased due to the sulfur in salt bath and friction coefficient depended systematically on surface hardness. For the second part of this study, four artificial neural network (ANN) models were designed to predict the weight loss and friction coefficient of the nitrided and unnitrided AISI 4140 steel. Load, velocity and sliding distance were used as input. Back-propagation algorithm was chosen for training the ANN. Statistical measurements of R2, MAE and RMSE were employed to evaluate the success of the systems. The results showed that all the systems produced successful results.

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