Microstructure and tribological behaviour of liquid nitrocarburised tool steels

Psyllaki, P.; Kefalonikas, G; Pantazopoulos, G.; Αντωνίου, Σταμάτης; Sideris, J.

doi:10.1016/s0257-8972(02)00566-2

Cited by 44 publications

(32 citation statements)

References 23 publications

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“…Following this drop, equivalent to Ti sliding against transferred Ti [18], larger fluctuations are also noticeable in the CoF. These have been correlated principally with the presence of third body particles, the adhesion between metallic titanium regions and differences between the static and kinetic friction coefficients creating stick-slip behaviour between the asperities [9,19].…”

Section: Wear and Friction Behaviourmentioning

confidence: 94%

A study of the reciprocating-sliding wear performance of plasma surface treated titanium alloy

Cassar

Wilson²,

Banfield

et al. 2010

Wear

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a b s t r a c tTriode plasma nitriding was used in conjunction with electron-beam plasma-assisted physical vapour deposition of TiN and CrAlN to enhance the wear resistance of Ti-6Al-4V titanium alloy. Linear reciprocating-sliding ball-on-plate wear tests were performed to assess the tribological performance of the treated alloy. Wear volumes were correlated to changes in coefficient of friction, which is often indicative of breakdown of the surface treatment. Debris generated during wear testing was characterised using scanning electron microscopy (SEM), energy-dispersive X-ray spectroscopy (EDX), X-ray diffraction (XRD) and laser diffraction for particle size analysis. Surface micro-profilometry and SEM were used to characterise the wear scars. The results obtained indicate that, in order to assess the relative improvement in wear behaviour attained by using surface treatments it is insufficient to compare linear wear rates alone. A clear comparison is only possible if testing is carried out in steps of increasing sliding distance, until the treated/deposited layers have been completely removed. Also, it is shown that the number of repeated tests necessary to evaluate clearly the treatment and/or coating can vary substantially, depending on the observed test progression; typically this necessitates the greatest number of repeats around the point of wear at which the ball counterface contact area is in transition from the treatment layer(s) to the substrate bulk. The inherent variability in wear performance under linear ballon-plate reciprocating-sliding is correlated to debris generation, changes in relative humidity -and the resultant wear mechanisms involved.

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Section: Wear and Friction Behaviourmentioning

confidence: 94%

A study of the reciprocating-sliding wear performance of plasma surface treated titanium alloy

Cassar

Wilson²,

Banfield

et al. 2010

Wear

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“…Nitrocarburizing is a thermochemical treatment applied mainly to iron alloys to improve fatigue strength, wear resistance, and corrosion resistance [1,2]. These improvements are attained by the diffusion of nitrogen and carbon beneath the surface, the formation of a compact compound layer (iron carbonitrides), and the formation of a thick diffusion zone, i.e., a region where the matrix nitrogen and carbon solubility limit is not exceeded.…”

Section: Introductionmentioning

confidence: 99%

Tool steel ion beam assisted nitrocarburization

Zagonel

Alvarez

2007

Materials Science and Engineering: A

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The nitrocarburization of the AISI-H13 tool steel by ion beam assisted deposition is reported. In this technique, a carbon film is continuously deposited over the sample by the ion beam sputtering of a carbon target while a second ion source is used to bombard the sample with low energy nitrogen ions. The results show that the presence of carbon has an important impact on the crystalline and microstructural properties of the material without modification of the case depth.

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“…Both steels contain carbide-forming elements that render them suitable for cold work applications. Their thorough microstructure characterisation has been reported in previous publications [3,4]. Since tool steels are not used in their soft-annealed state, but commonly after their heat treatment to the bulk working hardness required by their specific application, both grades were subjected to heat treatments in order to achieve three series of specimens per grade, having a bulk hardness of 40, 50 and 60 HRC.…”

Section: Materials and Treatmentsmentioning

confidence: 99%

“…An adverse combination of loads, sliding velocities and environmental factors can often induce severe failure of the surfaces in contact, via tearing, ploughing and significant plastic deformation, while massive material transfer between the two surfaces can be simultaneously observed [1,2,3,4]. This disastrous adhesive wear mechanism could result in seizure -virtual welding of the two surfaces -eventually rendering the relevant motion of the two metallic bodies no longer possible.…”

Section: Introductionmentioning

confidence: 99%

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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Microstructure and tribological behaviour of liquid nitrocarburised tool steels

Cited by 44 publications

References 23 publications

A study of the reciprocating-sliding wear performance of plasma surface treated titanium alloy

A study of the reciprocating-sliding wear performance of plasma surface treated titanium alloy

Tool steel ion beam assisted nitrocarburization

Surface treatment of tool steels against galling failure

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