Microstructure and tribological properties of complex nitrocarburized steel

Qiang, Ying Huai; Ge, Shi Rong; Xue, Qingquan

doi:10.1016/s0924-0136(00)00466-0

Cited by 25 publications

(13 citation statements)

References 1 publication

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“…The lamellar close packed ε-phase formed within the compound makes it difficult for metallic counterparts to adhere with, combined with easy sliding between planes helps to reduce friction [19]. The exposure of the diffusion zone with non-ceramic features would account for the high friction response observed.…”

Section: Wearmentioning

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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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: Wearmentioning

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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“…However, conflicting results have also been reported concerning the detrimental effect of oxidation treatment on the wear resistance and the negligible effect of the oxide film on the frictional behaviour of nitrocarburized steels. [3] This inconsistency may arise from the different oxidation conditions employed, since various oxidation temperatures have been reported, ranging from 300 to 570…”

Section: Microhardness and Wear Mechanismsmentioning

confidence: 99%

“…a shorter processing time, a lower cost and unlimited specimen size. [3,4] This treatment is a thermochemical process used to diffuse nitrogen and carbon into steel open surfaces. Salt bath nitrocarburizing known as Tenifer  process can be also justified by the importance of the diffusion rate of nitrogen atoms into the surface.…”

Section: Introductionmentioning

confidence: 99%

Post‐oxidizing effects on surface characteristics of salt bath nitrocarburized AISI 02 tool steel type

Fares¹,

Chaoui²,

Coze³

2009

Surface & Interface Analysis

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The effect of post-oxidizing treatment on the characteristics of modified surface layers produced by salt bath nitrocarburizing on the industrial American Iron and Steel Institute (AISI) 02 tool steel types is investigated. Nitrocarburizing treatment is performed for 6 h and 8 h at 570• C and post-oxidizing treatment for 30, 60 and 90 min at 520 • C, using argon-steam mixture. Formed layers are characterized by their basic properties such as thickness layer, depth, surface hardness and wear resistance. Detailed estimation of the modified metal surface quality, in terms of chemical composition, formed phases, microstructures and diffusion mechanisms are performed by metallographic techniques, EDX, X-ray diffraction, scanning electron microscopy (SEM) and glow discharge optical electron spectroscopy (GDOES). The corrosion resistance was investigated in 0.4 M H 2 SO 4 solutions, using steady-state electrochemical polarization methods. The obtained results revealed the existence of a superficial oxide layer which consists of magnetite (Fe 3 O 4 ) and hematite (Fe 2 O 3 ) and the presence of an ε-phase associated with a small amount of γ -phase. Important improvements in wear, microhardness and corrosion resistance occur after these treatments and it is specifically concluded that the sole application of a nitrocarburizing treatment does not significantly ameliorate the corrosion resistance of the as-received steel. In fact, post-oxidation treatment contributes to increase corrosion resistance by forming a dense magnetite layer and at the same time, it partially covers the compound layer pores.

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“…In addition, nitrocarburizing has many advantages compared with other techniques, that is, a lower treatment temperature, a shorter treatment time and a greater degree of shape and dimensional stability besides safety and appreciable reproducibility of the process. [3,4] The choice of salt bath nitrocarburizing known as FNC or Tenifer process is also justified by the importance of the diffusion speed of nitrogen atoms into the surface. The 570…”

Section: Introductionmentioning

confidence: 99%

Surface characteristics analysis of nitrocarburized (Tenifer) and carbonitrided industrial steel AISI 02 types

Fares

Touhami

Belaid

et al. 2008

Surface & Interface Analysis

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Generally, tool steels for cold work are obtained by rolling and forging processes. They are treated to have a structure conferring to the material a high toughness limit in terms of wear resistance and endurance. The objective of this study is the thermochemical heat treatment of industrial steel blades made of AISI 02 types, intended for polymer crushing. The effects of nitrocarburizing (Tenifer) and gaseous carbonitriding processes on surface characteristics are considered. These surface treatments increase the usefulness of properties, that is, fatigue strength, wear and corrosion resistance of this microalloyed steel. The influence of treatment duration and the thickness of the layers on surface properties are investigated. The analysis and characterization are carried out using physical analysis [optical microscopy, scanning electron microscopy, X-ray diffraction and glow discharge optical emission spectroscopy (GDOES) techniques] and mechanical measurements (microhardness, weight loss and residual stresses) of treated material. The results are intended to contribute in defining and optimizing the adequate choice of treatments for this type of steel in industrial conditions.

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Microstructure and tribological properties of complex nitrocarburized steel

Cited by 25 publications

References 1 publication

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

Post‐oxidizing effects on surface characteristics of salt bath nitrocarburized AISI 02 tool steel type

Surface characteristics analysis of nitrocarburized (Tenifer) and carbonitrided industrial steel AISI 02 types

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