Investigation of the Compound Layer Formed by Steel 16MnCr5 After Gas Nitriding

SylaNaim,; Zeqiraj, Arbër; HasiNazmi,; ElezajNjomza,

doi:10.1680/jemmr.18.00117

Cited by 3 publications

(2 citation statements)

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“…The phenomenon is caused by an increase in the extended surface of the investigated samples and extension of the boundary NH 3 /surface [ 7 ]. The thickness of the diffusion layer (NHD) can be described according to the following equation:

where k is a temperature-dependent constant and t is time of nitriding [ 29 , 30 ].…”

Section: Discussionmentioning

confidence: 99%

Influence of Surface Roughness on the Properties of Nitrided Layer on 42CrMo4 Steel

Moneta

Stodolny²,

Michalkiewicz

2023

Materials

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A crucial factor of a nitriding process of treated parts is surface roughness. Eight samples of 42CrMo4 steel were used to investigate the parameter represented by Ra. In the study, the innovative combined microhardness profiles were used to present results within the compound zone and diffusion layer. Therefore, two loads were applied in the compound zone, 5 gf, and diffusion layer, 500 gf. Observation with SEM and chemical analysis of the investigated samples showed a correlation between microstructure, nitrogen concentration and microhardness of the compound zone. XRD diffraction was used to identify the phase composition. Moreover, the X-ray photoelectron spectroscopy technique was also applied in the study. No distinct correlations between compound zone morphology and the Ra parameter were observed. The thickness value of the structure was constant and fluctuated around 20 µm in the vast majority of the examined cases. However, analysis of the results revealed a dependence between the Ra parameter and diffusion layer thickness. The values of this parameter varied in the range of 356–394 µm depending on the Ra parameter. A distinct nitrided layer was observed on the polished sample.

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where k is a temperature-dependent constant and t is time of nitriding [ 29 , 30 ].…”

Section: Discussionmentioning

confidence: 99%

Influence of Surface Roughness on the Properties of Nitrided Layer on 42CrMo4 Steel

Moneta

Stodolny²,

Michalkiewicz

2023

Materials

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“…With the aim of improving the physical characteristics of iron materials, and more specifically of steels, various methods are used, and one of them is nitriding [1][2][3][4][5][6][7][8]. This process takes place in temperatures of over 500 0 C and in solid, liquid or gas environments [9].…”

Section: Introductionmentioning

confidence: 99%

Comparison of Experimental Curves of Alloy Steels after Gas Nitriding

Syla

Aliaj

Elezaj

et al. 2021

International Journal of Computational and Experimental Science and Engineering

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This study is concerned with experimental curves of: hardness, residual stress and concentration of nitrogen at the precipitation layer at alloy steels after gas nitriding. The purpose of this treatment is that through experimental curves to identify the relationship and causality between hardness, on one side, and on the other, residual stress respectively concentration of nitrogen. Comparing the shape and slope of these curves we can conclude that, concentration of diffused nitrogen on the steel lattice, respectively ferrite, is a cause of increased hardness at the precipitation layer. More to the point, as a result of nitrogen diffusion, residual stress emerge which cause increase of hardness. The intensity and slope of the curves of hardness depends on the intensity and slope of the nitrogen concentration respectively residual stress.

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The depth of the diffusion of nitrogen in 16MnCr5 steel after gas nitriding

SylaNaim

Aliaj

DalipiBashkim³

et al. 2022

Emerging Materials Research

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This research aims to determine the depth of diffusion of nitrogen in steel 16MnCr5 after gas nitriding. Nitriding was performed in the ammonia atmosphere at three temperatures (510, 550 and 590°C), with four different durations for each temperature. The research techniques were metallographic and electron probe micro-analysis (EPMA). According to the first method, with the optical microscope Neophot 30 of the firm Carl Zeiss Jena, the surfaces of all samples were observed. The nitriding layers were photographed with the help of a microscope, from which the depths of nitrogen diffusion were determined. The hardness-depth profiles of nitride specimens were determined with a Vickers automatic micro-hardness tester from LECO, and the distance between two consecutive points was 50 μm. The depth of nitrogen diffusion into the nitride samples was determined from the hardness curves. The nitrogen concentration-depth profiles of the nitrided specimens were determined with EPMA using a Joel JXA-8900RL microanalyser operated at 20 kV. A comparison of the results of the different experimental methods was made, which allowed conclusions to be made as regards the depth of nitrogen diffusion in 16MnCr5 steel.

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Investigation of the Compound Layer Formed by Steel 16MnCr5 After Gas Nitriding

Cited by 3 publications

References 0 publications

Influence of Surface Roughness on the Properties of Nitrided Layer on 42CrMo4 Steel

Influence of Surface Roughness on the Properties of Nitrided Layer on 42CrMo4 Steel

Comparison of Experimental Curves of Alloy Steels after Gas Nitriding

The depth of the diffusion of nitrogen in 16MnCr5 steel after gas nitriding

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