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

Zdravecká, E.; Slota, Ján; Solfronk, Pavel; Kolnerova, Michaela

doi:10.1007/s11665-017-2787-3

Cited by 20 publications

(7 citation statements)

References 26 publications

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“…A complete description of the frictional conditions during stamping is very complicated and requires taking into account the properties of the frictional pair of materials, their surface characteristics such as texture and roughness, mechanical properties of materials, as well as the quantity and properties of the lubricant, and finally various kinematic and dynamic process conditions [ 6 , 7 , 8 ]. The selection of appropriate friction conditions is extremely important, not only to ensure the required quality of the pressed pieces, but also to minimize the wear of the forming tools [ 8 , 9 , 10 ].…”

Section: Introductionmentioning

confidence: 99%

Modelling of Friction Phenomena Existed in Drawbead in Sheet Metal Forming

et al. 2021

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The article presents the results of friction tests of a 0.8 mm-thick DC04 deep-drawing quality steel sheet. A special friction simulator was used in the tests, reflecting friction conditions occurring while pulling a sheet strip through a drawbead in sheet metal forming. The variable parameters in the experimental tests were as follows: surface roughness of countersamples, lubrication conditions, sample orientation in relation to the sheet rolling direction as well as the sample width and height of the drawbead. Due to many factors that affect the value of the coefficient of friction coefficient, artificial neural networks (ANNs) were used to build and analyse the friction model. Four training algorithms were used to train the ANNs: back propagation, conjugate gradients, quasi-Newton and Levenberg–Marquardt. It was found that for all analysed friction conditions and sheet strip widths, increasing the drawbead height increases the COF value. The chlorine-based Heavy Draw 1150 compound provides a more effective friction reduction compared to a LAN-46 machine oil.

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Section: Introductionmentioning

confidence: 99%

Modelling of Friction Phenomena Existed in Drawbead in Sheet Metal Forming

et al. 2021

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“…Surface modification processes influence microstructure and properties of steels [25][26][27][28][29] even at a low-temperature nitriding process [30]. Hydrogen-free ion nitriding improves the mechanical characteristics and performance of hard alloys T5K10 and T15K6 [31].…”

Section: Figurementioning

confidence: 99%

Surface Hardening of Massive Steel Products in the Low-pressure Glow Discharge Plasma

et al. 2019

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A process vacuum chamber is filled with a homogeneous plasma of glow discharge with electrostatic electron confinement, which is used for surface hardening of massive products. At the current of 2–20 A and the gas pressure ranging from 0.1 to 1 Pa the discharge voltage amounts to 350–500 V. When a bias voltage of 2 kV is applied to an immersed in the plasma hollow cylinder with a mass of 15 kg, electrical power spent on heating it by accelerated ions exceeds by an order of magnitude the power spent on the discharge maintenance. The massive cylinder is heated up to 700 °C for 15 min. When argon mixture with nitrogen (30%) is used, the nitriding for 3h results in an increase in the surface hardness from 400 up to 1000 HV50 and the nitrided layer thickness grows to ~100 μm. The nitriding rate is enhanced by a high degree of nitrogen dissociation due to decomposition by fast electrons and surface structural defects due to bombardment by high-energy ions.

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“…According to Fe-N phase diagram, for conventional nitriding, nitrided layer are composed of a diffusion zone and a compound layer which consist predominantly of iron nitrides ε-Fe 2-3 N and γ′-Fe 4 N [4][5][6][7]. In general, the wear resistance improvement depends on the properties of the whole nitrided layer (compound layer + diffusion layer) [8][9][10]. While, the corrosion resistance is only determined by the compound layer because of its high chemical stability in aggressive media.…”

Section: Introductionmentioning

confidence: 99%

Influence of compound layer on the corrosion resistance of low alloy steel in a 3.5% NaCl solution

Wang

2024

Eng. Res. Express

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Samples of AISI 4140 low alloy steel were nitrided at different conditions by using plasma nitriding. The optical microscopy observation and X-ray diffraction analysis showed that a 3~14 m thick compound layer composed of -Fe2–3N and γ′-Fe4N was formed on the surface after nitriding treatments. The corrosion behavior was evaluated by measuring the anodic polarization curves in a 3.5% NaCl solution along with the observation of corroded surfaces and cross-sectional morphologies using optical and scanning electron microscope. The results indicated that the corrosion resistance of low alloy steel was significantly enhanced through the formation of compound layer. The thickness of compound layer was one important factor in determining its corrosion resistance.

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

Cited by 20 publications

References 26 publications

Modelling of Friction Phenomena Existed in Drawbead in Sheet Metal Forming

Modelling of Friction Phenomena Existed in Drawbead in Sheet Metal Forming

Surface Hardening of Massive Steel Products in the Low-pressure Glow Discharge Plasma

Influence of compound layer on the corrosion resistance of low alloy steel in a 3.5% NaCl solution

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