Transition between mild and severe wear in titanium alloys

Farokhzadeh, K.; Edrisy, Afsaneh

doi:10.1016/j.triboint.2015.08.020

Cited by 81 publications

(25 citation statements)

References 37 publications

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“…Under cyclic loading, these crack initiations coalesced to form larger cracks leading to fatigue fracture. More importantly, there was a region of plastic deformation adjacent to the worn surface [ 40 ]. Pores in this region were susceptible to plastic deformation which would bring about subsurface delamination initiation at normal loads.…”

Section: Resultsmentioning

confidence: 99%

Influence of Ultrasonic Surface Rolling on Microstructure and Wear Behavior of Selective Laser Melted Ti-6Al-4V Alloy

et al. 2017

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The present article studied the effect of ultrasonic surface rolling process (USRP) on the microstructure and wear behavior of a selective laser melted Ti-6Al-4V alloy. Surface characteristics were investigated using optical microscope, nano-indentation, scanning electron microscope, transmission electron microscope and laser scanning confocal microscope. Results indicated that the thickness of pore-free surfaces increased to 100~200 μm with the increasing ultrasonic surface rolling numbers. Severe work hardening occurred in the densified layer, resulting in the formation of refined grains, dislocation walls and deformation twins. After 1000 N 6 passes, about 15.5% and 14.1% increment in surficial Nano-hardness and Vickers-hardness was obtained, respectively. The hardness decreased gradually from the top surface to the substrate. Wear tests revealed that the friction coefficient declined from 0.74 (polished surface) to 0.64 (USRP treated surface) and the wear volume reduced from 0.205 mm−3 to 0.195 mm−3. The difference in wear volume between USRP treated and polished samples increased with sliding time. The enhanced wear resistance was concluded to be associated with the improvement of hardness and shear resistance and also the inhibition of delamination initiation.

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Section: Resultsmentioning

confidence: 99%

Influence of Ultrasonic Surface Rolling on Microstructure and Wear Behavior of Selective Laser Melted Ti-6Al-4V Alloy

et al. 2017

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“…Recently, studies carried out on near-β titanium and α+β alloys [40] concluded that the transition between mild and severe wear is characterized by the crack growth in the oxide film as a result of the local stress concentration. In this case, the MMLs presented cracking, followed by crack propagation, and finally delamination.…”

Section: The Coefficient Of Friction and Wear Analysismentioning

confidence: 99%

Wear modes in open porosity titanium matrix composites with TiC addition processed by spark plasma sintering

Farías

Olmos

Jiménez

et al. 2019

Transactions of Nonferrous Metals Society of China

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Titanium Matrix Composites (TMCs) are related to their low specific weight, high elastic modulus and tensile strength. In wear resistance, the benefits of particle reinforcing and the wear mechanisms occurring during sliding events are still under investigation. This work focused on the influence of TiC reinforcing particles on the tribological properties of TMCs with open porosity, processed by Spark Plasma Sintering (SPS). Materials composed of an equimolar mixture of Ti and TiH2 with 0, 3, 10 and 30 vol% of TiC were sintered at 850°C. Wear tests were carried out using a tribometer in a ball-on-flat configuration. Characterization included density measurements, phase identification, hardness, and wear track analysis. Results showed a microhardness increment from 281 to 554 HV with increasing TiC content. The Coefficient of Friction (CoF) showed a minimum of 0.2 for 10%TiC grade. 3D-profilometry showed the wear volume to decrease 13 times for the 10%TiC reinforced material in comparison to the TiC-free material. For the 3%TiC composite, adhesive wear with severe plastic deformation was identified. The 10%TiC material showed a Mechanical Mixed Layer (MML). The 30% TiC composite showed abrasion as the main wear mechanism. In conclusion, the wear mechanisms, CoFs and wear volume varied with TiC content.

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“…Many studies have been devoted to their limitations in applications on tribological [8][9], fatigue and ageing aspects [10][11][12][13][14][15][16]. We focus here on static loadings (creep behaviour) on samples in which oxidation affects only a small proportion of the section, as the sensitivity of titanium alloys to strain rate effect is well known [17][18][19][20].…”

Section: Introductionmentioning

confidence: 99%

Oxidation of Ti–6Al–4V alloy between 450 and 600°C. Evolution of microstructure and mechanical properties

et al. 2020

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Titanium alloys are widely used in many applications thanks to their good corrosion resistance and to their high specific modulus. However, at temperatures above 450°C, oxidation must be taken into account to improve life assessment of components. Especially for long-term exposures, oxidation leads to an oxide scale along with an oxygen enrichment in the metal below this oxide scale. In this study, the oxidation behaviour of Ti– 6Al–4V is investigated between 450 and 600°C for a maximum duration of about 6800 h. Scanning electron microscope (SEM) and transmission electron microscopy (TEM) are used to characterize the oxide layer and the layer affected by oxygen uptake. The local oxygen content is quantified. Vibration tests are performed to determine elastic properties on thin specimens with different thicknesses affected by oxygen enrichment. Creep tests are also carried out to quantify the influence of this oxygen uptake on viscoplastic behaviour. An oxygen-enriched zone occupying 5% of the cross-section of a specimen is sufficient to induce detectable changes in its creep behaviour.

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Transition between mild and severe wear in titanium alloys

Cited by 81 publications

References 37 publications

Influence of Ultrasonic Surface Rolling on Microstructure and Wear Behavior of Selective Laser Melted Ti-6Al-4V Alloy

Influence of Ultrasonic Surface Rolling on Microstructure and Wear Behavior of Selective Laser Melted Ti-6Al-4V Alloy

Wear modes in open porosity titanium matrix composites with TiC addition processed by spark plasma sintering

Oxidation of Ti–6Al–4V alloy between 450 and 600°C. Evolution of microstructure and mechanical properties

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