Scratch resistance analysis of plasma-nitrided Ti–6Al–4V alloy

Farokhzadeh, K.; Edrisy, Afsaneh; Pigott, Gwyn Hanssen; Lidster, P.

doi:10.1016/j.wear.2013.01.070

Cited by 54 publications

(20 citation statements)

References 24 publications

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“…This was attributed to the formation of a thin compound layer ( o2 mm) on top of a deep diffusion zone ( $ 45 mm) during the low temperature nitriding treatment at 600 1C (Fig. 1): the former restricted the level of brittle failure on the surface while the latter provided mechanical support and increased the load bearing capacity by acting as a graded interface between the compound layer and Ti substrate [15]. On the other hand, a plasma nitriding at 600 1C did not have any side effects on the tensile strength, toughness and microstructure of the alloy as the average grain size in the substrate showed only a 9% grain growth after a 24 h treatment.…”

Section: Discussionmentioning

confidence: 99%

“…The plasma nitriding treatment was performed at 600 1C for 24 h. In order to study the effect of high temperature on microstructure, tensile and fatigue properties, the plasma nitriding temperature of 900 1C was investigated as well for the purpose of comparison. The details of the plasma nitriding treatment procedure are explained elsewhere [15].…”

Section: Methodsmentioning

confidence: 99%

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Fatigue improvement in low temperature plasma nitrided Ti–6Al–4V alloy

Farokhzadeh

Edrisy

2015

Materials Science and Engineering: A

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Section: Discussionmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Fatigue improvement in low temperature plasma nitrided Ti–6Al–4V alloy

Farokhzadeh

Edrisy

2015

Materials Science and Engineering: A

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“…Surprisingly, in this case, processing at 900 o C does not result in a significant increase in critical load prior to failure. At 900 o C, the very thin TiN surface compound formed is not as tough as the Ti 2 N+TiN compound layer formed on the Ti64 coupons and therefore is not able to accommodate the plastic deformation caused during the scratch test [25]. In this case the brittle, thin TiN surface layer is unable to conform to the plastic deformation in the substrate, which results in its fracture and removal.…”

Section: Tribological Behaviourmentioning

confidence: 99%

Improving the surface characteristics of Ti-6Al-4V and Timetal 834 using PIRAC nitriding treatments

Attard

Leyland

Matthews

et al. 2018

Surface and Coatings Technology

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Despite the popularity of a number of techniques of thermochemical diffusion for titanium, in many cases the surface engineering processes used may not be economically viable options for industry. This work focuses on the application of Powder Immersion Reaction Assisted Coating (PIRAC), a relatively inexpensive nitriding treatment that is capable of providing a remarkable improvement in the surface characteristics of titanium alloys. The aim of this work was to determine whether PIRAC could be successfully applied to Ti-6Al-4V and the high-performance near-titanium alloy Timetal 834. In order to study the response of these materials to PIRAC nitriding, techniques such as X-ray diffraction, micro-indentation hardness, surface profilometry, optical and electron microscopy, nano-scratch adhesion testing and ball-on-plate reciprocatingsliding wear testing were employed. These techniques highlighted the markedly different response between the two alloys to the PIRAC treatment; namely, that Ti-6Al-4V forms a thick compound layer, while at the same processing temperature and time Timetal834 does not form any appreciable Ti 2 N phase instead forming a nitrogen-diffusion case with a thin TiN compound layer at the surface. This inherent difference in nitridability influences the metallurgical response of each alloy. Despite this, the surfaces of both alloys were still hardened considerably and their tribological performance in dry sliding conditions improved compared to the untreated alloys.

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“…When the indenter slides on the work surface, forces produce horizontal compressive stress in front of the indenter but a corresponding tensile stress behind it [43]. The tensile stress would easily cause surface cracking.…”

Section: Scratch Behavior Of Porous Pure Al and Al 6061mentioning

confidence: 99%

Effect of Surface Porosity on Tribological Properties of Sintered Pure Al and Al 6061

Sinha¹,

Farhat²

2015

MSA

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Due to light weight, high specific strength, high corrosion resistance and good heat transfer ability, aluminium alloys are becoming attractive for critical structural applications. These alloys can be manufactured using powder metallurgy techniques in which porosity is a common characteristic. The presence of pores is responsible for decreasing effective load bearing cross sectional area and inducing stress concentration sites for strain localization and damage, decreasing both strength and ductility. The present study aims to establish a better understanding of the relationship between surface porosity and corresponding wear behavior. In this study, porous specimens were produced using powder metallurgy technique and the extent of wear damage and the type of wear was investigated under low load range of 1.5-5 N against AISI 52100 bearing steel ball using a reciprocating ball-on-flat configuration and frequency of 10 Hz. Scanning electron microscopy of the wear tracks and wear debris was carried out to understand wear mechanisms. This study revealed that due to combined effect of high stress intensity and subsurface cracking, wear rate increases with increasing porosity content. The friction and wear behavior of pure Al and Al 6061 as a function of porosity content can be attributed to their hardness and corresponding wear mechanism.

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Scratch resistance analysis of plasma-nitrided Ti–6Al–4V alloy

Cited by 54 publications

References 24 publications

Fatigue improvement in low temperature plasma nitrided Ti–6Al–4V alloy

Fatigue improvement in low temperature plasma nitrided Ti–6Al–4V alloy

Improving the surface characteristics of Ti-6Al-4V and Timetal 834 using PIRAC nitriding treatments

Effect of Surface Porosity on Tribological Properties of Sintered Pure Al and Al 6061

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