Plasma nitriding behavior of low carbon binary alloy steels

Nakata, Kohei; Yamauchi, Wataru; Akamatsu, Katsuya; Ushio, Masao

doi:10.1016/s0257-8972(03)00459-6

Cited by 32 publications

(5 citation statements)

References 5 publications

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“…When nitriding is performed on steel with strong nitride-forming alloying elements such as aluminum, chromium, vanadium, or molybdenum, the nitrogen supplied from the top surface diffuses to the inside, combines with these alloy elements, and forms hard and fine nitrides (AlN, CrN, VN, MoN etc.) in the matrix of the steel [5,6]. In general, nitrided regions consist of two layers.…”

Section: Introductionmentioning

confidence: 99%

Tribological Properties of Nitrided Steels Lubricated with Fully Formulated Oils in Boundary Lubrication Condition

et al. 2018

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Nitriding is one of the most popular heat treatments widely used in hydraulic sliding parts of automotive or construction machinery components. Since the nitrided steels shows great wear resistance due to its high hardness, it is widely applied to various sliding parts in the hydraulic system of construction machinery. During operation, these parts are usually lubricated with fully formulated oils, which include various additives such as dialkyldithiophosphate (ZnDTP), dispersant, detergent, etc. In this study, the tribological features of two kinds of nitrided surfaces lubricated with fully formulated oil and sample oils were evaluated by changing the combination of additive element formulations, and the effect of additive formulation on tribofilm formation and frictional property were investigated in detail. As a result, it was revealed that there is a large interaction between the nitrided surfaces and additives, the coexistence of ZnDTP and detergent affects the phosphorous-derived tribofilm formation on nitrided surface as well as their frictional properties. In particular, the low frictional characteristics of nitrided compound layer was characterized by the smoothed surface and low tribofilm formation on the track.

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Section: Introductionmentioning

confidence: 99%

Tribological Properties of Nitrided Steels Lubricated with Fully Formulated Oils in Boundary Lubrication Condition

et al. 2018

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“…The diffusion of nitrogen ions into interstitial sites, lattice distortions (strain), and flaws are all contributing to this tendency, and this is caused by a higher ion flow in the base material. The micro stresses may also be created in the lattice structure and are used to broaden the peaks and improve the hardness [ 55 ].…”

Section: Resultsmentioning

confidence: 99%

Study of the Role of Titanium and Iron Cathodic Cages on Plasma-Nitrided AISI 430 Ferritic Stainless Steel

Babur

Noori²,

Iqbal

et al. 2022

Micromachines

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In contrast to austenitic and martensitic stainless steels, ferritic stainless steels have a lower hardness and wear resistance but exhibit excellent corrosion resistance. Due to this fact, their use in the aerospace, automobile, and house construction industries is restricted. Several methods have been utilized to enhance the tribological characteristics of ferritic stainless steels. In this work, titanium nitride coating has been carried out by using a cathodic cage of titanium material, and later on, the titanium cathodic cage is replaced by an AISI-304 cathodic cage in a CCPN chamber to form iron nitride coating on AISI-430 ferritic stainless steel coupons through a plasma nitriding process for 4 h at a fixed temperature of 400 °C. The microstructures and mechanical traits of all processed and control coupons were analyzed using scanning electron microscopy, X-ray diffraction, ball-on-disc wear tester, and microhardness tester techniques. The results showed that hardness increased up to 1489 HV with the titanium cage, which is much higher than the hardness of the base material (270 HV). The titanium cage-treated coupons have high layer thickness, smooth surface morphology, and a minimum crystallite size of 2.2 nm. The wear rate was reduced up to 50% over the base material after the titanium cage plasma treatment. The base coupon exhibited severe abrasive wear, whereas nitrided coupons exhibited dominant adhesive wear. In the iron nitride coatings, this effect is also important, owing to the more influential cleaning process in a glow discharge, and the better adhesion with enhanced interlayer thickness is attributed to the fact that the compliance of the interlayer minimizes shear stresses at the coating–substrate interface. The use of a graded interface improves adhesion compared with the case where no interlayer is used but a titanium interlayer of comparable thickness provides a significant increase in measured adhesion. For both titanium and iron nitride films, there is a reduction in wear volume which is a function of interlayer thickness; this will have a substantial effect on wear lifetime. Thus by careful control of the interlayer thickness and composition, it should be possible to improve coating performance in tribological applications.

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“…In the literature, the introduction of compressive residual stresses related to the plasma nitriding process is reported as the reason for this broadening 15. Nakata et al16 indicate that the peak broadening, associated to the presence of microstrains in the matrix, could be caused by the appearance of a coherent pre‐precipitation phase. Nevertheless, it cannot be ignored that the compound layer elimination, performed by mechanical removal, could have introduced residual stresses in the material surface as well 17.…”

Section: Resultsmentioning

confidence: 99%

Mechanical Properties of Layers Obtained by DC‐Pulsed Plasma Nitriding on a Low‐Alloy Steel (AISI 4140)

Dutrey

Heras

Svoboda

et al. 2009

Plasma Processes & Polymers

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An industrial DC‐pulsed plasma nitriding (DCPPN) equipment was used to obtain samples of an AISI 4140 low‐alloy steel with five different configurations: substrate, substrate + diffusion zone, diffusion zone, substrate + diffusion zone + compound layer, and diffusion zone + compound layer. The microstructures of the samples were investigated by scanning electron microscopy and X‐ray diffraction. Microhardness and tensile tests were performed, and the fracture mechanisms for the different materials were finally analyzed and discussed. The DCPPN produced an increase in the elastic modulus as well as in the yield strengths, together with a pronounce ductility loss, associated to the brittle intergranular fracture surface due to the nitride precipitation in the grain boundaries.

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Plasma nitriding behavior of low carbon binary alloy steels

Cited by 32 publications

References 5 publications

Tribological Properties of Nitrided Steels Lubricated with Fully Formulated Oils in Boundary Lubrication Condition

Tribological Properties of Nitrided Steels Lubricated with Fully Formulated Oils in Boundary Lubrication Condition

Study of the Role of Titanium and Iron Cathodic Cages on Plasma-Nitrided AISI 430 Ferritic Stainless Steel

Mechanical Properties of Layers Obtained by DC‐Pulsed Plasma Nitriding on a Low‐Alloy Steel (AISI 4140)

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