Laser Surface Modification of Ti—6Al—4V: Wear and                 Corrosion Characterization in Simulated Biofluid

Singh, Raghuvir; Kurella, Anil; Dahotre, Narendra B.

doi:10.1177/0885328206055998

Cited by 79 publications

(36 citation statements)

References 26 publications

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“…As the irradiance increased, a more homogeneous meltpool depth with fewer disconti¬nuities was observed. Lower meltpool depths were obtained in this experiment compared to other laser surface modification studies [20,21].…”

Section: Roughness Characterisationcontrasting

confidence: 53%

“…This paper presents laser surface melting under an argon environment to prevent oxidation and alloying with air elements during processing. The work utilised high speed laser processing capable of combinations of lower irradiances and higher residence times compared to previous research [20][21][22][23][24][25]. Low residence time allows for higher cooling rates, thus producing a more dynamic solidification which allows for novel phase formation and more homogeneous microstructures.…”

Section: Introductionmentioning

confidence: 99%

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High speed laser surface modification of Ti–6Al–4V

Chikarakara

Naher

Brabazon

2012

Surface and Coatings Technology

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Titanium and its alloys have been commonly used for biomedical implant applications for many years; however, associated high coefficient of friction, wear characteristics and low hardness have limited their long term performance. This article investigates the effects of the high speed laser surface modification of Ti6A1-4V on the microstructure, surface roughness, meltpool depth, phase transformation, residual strain, microhardness, and chemical composition. Laser treatment was carried out using a 1.5 kW CO 2 laser in an argon gas environment. Irradiance and residence time were varied between 15.7 to 26.7 kW/mm 2 and 1.08 to 2.16 ms respectively. Laser treatment resulted in a 20 to 50 pm thick surface modified layer without cracks. An increase in residence time and irradiance resulted in higher depth of processing. Surface roughness was found to decrease with increase in both irradiance and residence time. Metallography showed that a martensite structure formed on the laser treated region producing acicular a-Ti nested within the aged p matrix. The laser treatment reduced volume percentage of p-Ti as compared to the non-treated surface. Lattice stains in the range of 0.81% to 0.91% were observed after laser surface modification. A significant increase in micro-hardness was recorded for all laser treated samples. Microhardness increased up to 760 HV 0 . 05 which represented a 67% increase compared to the bulk material. Energy Dispersive X-ray Spectroscopy (EDS) analysis showed that laser surface modification produced a more homogenous chemical composition of the alloying elements compared to the untreated bulk metal.

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Section: Roughness Characterisationcontrasting

confidence: 53%

Section: Introductionmentioning

confidence: 99%

High speed laser surface modification of Ti–6Al–4V

Chikarakara

Naher

Brabazon

2012

Surface and Coatings Technology

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“…The laser technique produces a smaller heataffected zone (HAZ) and reduced distortion. However, the presence of pores, changes in the microstructures in HAZ and new surface characteristics could influence in corrosion behaviour and fatigue and corrosion-fatigue of titanium and Ti-6Al-4V alloy [8,9]. Results for the mechanical properties of laser treated of Titanium and Ti-6Al-4V alloy are not available in the literature.…”

Section: Introductionmentioning

confidence: 99%

Corrosion and corrosion-fatigue behavior of cp-Ti and Ti–6Al–4V laser-marked biomaterials

Gil

Delgado

Espinar

et al. 2012

J Mater Sci: Mater Med

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The aim of this work was to determine the influence of laser surface modification treatments on mechanical and electrochemical behavior in Ti and Ti-6Al-4V implants. For each metal, different samples were laser modified simulating the markings according to the international requirements. (It is necessary in each metallic biomaterial to mark the serial, batch and company numbers.) Microstructural changes produced by this treatment were observed: (a) the melting zone with small grain sizes and martensitic structures in above-mentioned metals and (b) the heat-affected zone (HAZ) with alpha phase in cp-Titanium with bigger grain sizes and Widmanstatten structure in Ti-6Al-4V. Positive tensile residual stress was determined by means X-ray analysis in the zones marked by laser. Furthermore, corrosion behavior was studied in a simulated body fluid at 37°C. Pitting was observed in different zones near the HAZ and the results showed a decrease of the corrosion resistance in the laser treated samples. Residual stresses and the martensitic microstructures favoured the decrease of the corrosion-fatigue life around 20% of both metals under physiological conditions.

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“…Titanium is the most widely used biomaterial for medical implants [1] because of its good corrosion resistance, low density and good biocompatibility [2]. Though the Ti-6Al-4V alloy exhibits excellent corrosion properties, the metal ions released by corrosion or wear processes may promote aseptic loosening after long-term implantation [3].…”

Section: Introductionmentioning

confidence: 99%