Influence of microstructure on the sliding wear behavior of nitrocarburized tool steels

Karamboiki, C.-M.; Mourlas, Athanasios; Psyllaki, P.; Sideris, J.

doi:10.1016/j.wear.2013.04.002

Cited by 24 publications

(16 citation statements)

References 17 publications

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“…The ε layer composed from nitrocarburising contains porosity caused by the association of dissolved nitrogen as gas molecules ( N 2 ) at grain boundaries and within grains. At the surface-adjacent part of the layer, porosity is most distinguishable due to this layer having the largest dissolved nitrogen content [9,10].…”

Section: Introductionmentioning

confidence: 99%

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Effects of Using Alternative Extreme Pressure (EP) and Anti-Wear (AW) Additives with Oxy-Nitrided Samples

et al. 2018

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Oxy-nitriding is a widely used industrial process aiming to improve the tribological properties and performance of components. Previous studies have shown the effectiveness of the treatment with friction and wear performance, but very few have focussed on optimising this behaviour. The lubrication properties of several EP and AW additives were examined to investigate their effectiveness in improving the tribological properties of the layers formed after treatment. Previous studies showed the presence of an oxide layer on the sample could improve the effectiveness of the sulphurised olefin (SO) and tricresyl phosphate (TCP) additives. The friction and wear behaviour of oxy-nitrided samples were analysed using a tribometer and surface profiler. Scanning electron microscope, energy-dispersive X-ray spectroscopy and X-ray photoelectron spectroscopy were employed to identify the morphologies and chemical compositions of the treated surface before and after testing. No real effect on friction was observed when using the SO or TCP additives, mostly due to lack of interaction with the less reactive iron nitride layer and their roles as anti-wear additives. However, when the zinc dialkyldithiophosphatecontaining lubricant was used, a higher friction coefficient was observed. Greater improvements in anti-wear properties with the presence of additives in comparison with only using base oil were reported, with the TCP additive producing the lowest wear rates. The study effectively demonstrated that the additive package type used could impact the tribological and tribochemical properties of oxy-nitrided surfaces.

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Section: Introductionmentioning

confidence: 99%

“…With alloyed steels, the diffusion zone is mostly composed of solid solution (α-Fe, N), and due to alloying elements, nitrides and carbonitrides such as γ′-Fe 4 N and ζ-Fe 2 N are formed in the diffusion layer due to precipitation [8,10]. This is due to the diffused nitrogen interacting alloying elements such as chromium and vanadium.…”

Section: Introductionmentioning

confidence: 99%

Effects of Using Alternative Extreme Pressure (EP) and Anti-Wear (AW) Additives with Oxy-Nitrided Samples

et al. 2018

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“…Previous studies from several groups, among them of one of the present authors [6], have identified nitrocarburizing surface treatment as an effective means for the diminution of the wear coefficient of tool steels by an order of magnitude. Capitalizing on these results, in the present study two representative cold work tool steels after heat treatment and heat/surface treatment were subjected to plane-contact, nonlubricating sliding friction testing.…”

Section: Introductionmentioning

confidence: 80%

Surface treatment of tool steels against galling failure

et al. 2018

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Abstract. In the present study two highly alloyed steel grades, intended for cold working applications, were subjected to plane-contact, nonlubricating sliding friction testing in order to estimate the working regions (applied pressure and sliding velocity) that are governed by mild, moderate and severe wear mechanisms, before and after nitrocarburizing. For this purpose, both tool steel grades were initially pre-subjected to the proper heat treatments, in order to achieve a final bulk hardness of 40, 50 and 60 HRC whereas, after heat treatment, half of the material specimens were further subjected to nitrocarburizing surface treatment. The comparative experimental study of heat-treated and heat-/ surface-treated grades within a wide range of applied pressure and sliding velocity values, in combination to the development of a relevant Artificial Neural Network, allowed to determine the areas of recommended operation of such tribosystems. In all cases, the positive influence of the post-hardening surface treatment was proved; further work is in progress to generalize these preliminary results and establish the relevant wear maps correlating the wear lifetime, the hardening levels and the surface treatment to the operational plane sliding conditions.

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“…Effective ways of surface hardening are thermo-mechanical surface treatments or PVD coatings or combining two of them in duplex treatments [4][5][6]. The most important treatments are nitriding, nitrocarburising or carburising [7][8]. Nitriding and nitrocarburising are also widely used in case of molds for injection molding.…”

Section: Introductionmentioning

confidence: 99%

“…mass loss (as wear loss) [10][11], wear coefficient [8,[12][13][14], and by analyzing the worn surface. For qualitative characterization to study the worn morphology and thus the wear mechanism, microscopic techniques are generally used, like conventional optical microscope (stereo microscope) or scanning electron microscope [10][11][15][16][17] and there are different kinds of confocal microscopes [13].…”

Section: Introductionmentioning

confidence: 99%

Study of 2D and 3D Methods for Worn Surface Analysis of Tool Materials

2015

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This paper is dealing with the comparison of the results given by different worn surface analysing methods. Maraging steel tool materials were used for the experiments. Specimens were produced by direct metal laser sintering from metal powder and by conventional way from rod having equivalent chemical content. The samples were age-hardened and surface treated by nitrocarburising and oxynitriding and they were tested by pinon-disc type tribometer. The tribological behaviour was compared by using different methods for worn surface analysis. Worn area of the surface was determined by the surface profiles of 2D measurements and the wear volume was calculated by using 3D images of focus variation microscopy measurements.

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Influence of microstructure on the sliding wear behavior of nitrocarburized tool steels

Cited by 24 publications

References 17 publications

Effects of Using Alternative Extreme Pressure (EP) and Anti-Wear (AW) Additives with Oxy-Nitrided Samples

Effects of Using Alternative Extreme Pressure (EP) and Anti-Wear (AW) Additives with Oxy-Nitrided Samples

Surface treatment of tool steels against galling failure

Study of 2D and 3D Methods for Worn Surface Analysis of Tool Materials

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