The Possibility Of Use Of Laser-Modified Ti6Al4V Alloy In Friction Pairs In Endoprostheses

Abstract The purpose of this paper is to show results of laser treatment at cryogenic conditions of the Ti6Al4V alloy used for orthopedic applications. That modification process ought to bring beneficial changes of microstructure and residual stresses in the surface layer. The paper presents the abrasive wear of the base and laser remelted material in association with ceramics Al2O3. Despite the surface cracking after laser treatment the tribological properties in simulated body fluid have been substantially improved.

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Effects of Laser Remelting at Cryogenic Conditions on Microstructure and Wear Resistance of the Ti6Al4V Alloy Applied in Medicine

Solid State Phenomena ◽

10.4028/www.scientific.net/ssp.183.215 ◽

2011 ◽

Vol 183 ◽

pp. 215-224 ◽

Cited By ~ 1

Author(s):

A. Zieliński ◽

M. Jażdżewska ◽

J. Łubiński ◽

Waldemar Serbiński

Keyword(s):

Surface Treatment ◽

Laser Treatment ◽

Laser Power ◽

Ti6al4v Alloy ◽

Laser Remelting ◽

Linear Rate ◽

Surface Cracking ◽

Continuous Work ◽

Cryogenic Conditions ◽

Made In

The titanium and its alloys can be subjected to surface treatment, including laser treatment. In this work a new laser treatment at cryogenic conditions of Ti6Al4V alloy has been described. The work has been aimed at establishing whether such surface treatment could be suitable for implants working under wear in biological corrosive environment. The remelting has been made with the use of CO2 continuous work laser at laser power between 3 and 6 kW, at scan rate 0.5 and 1 m/s. The microstructure, surface topography, hardness, microhardness and wear linear rate and mass loss under tribological tests made in Ringer`s solution have been made. The results have shown that despite the surface cracking the tribological properties in simulated body fluid have been substantially improved.

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Effects of Co2 and Nd:YAG Laser Remelting of the Ti6Al4V Alloy on the Surface Quality and Residual Stresses

Advances in Materials Science ◽

10.2478/adms-2020-0005 ◽

2020 ◽

Vol 20 (1) ◽

pp. 82-90 ◽

Cited By ~ 2

Author(s):

M. Jażdżewska

Keyword(s):

Energy Density ◽

Residual Stresses ◽

Laser Treatment ◽

Nd:Yag Laser ◽

Heating Temperature ◽

Ti6al4v Alloy ◽

Surface Cracking ◽

Nd:Yag Lasers ◽

Compressive Stresses ◽

Hardness Increase

AbstractThe titanium alloys are materials susceptible to tribological wear and the laser treatment can be applied in surface treatment processes to obtain for example higher hardness level. From the other side, it is important to take into consideration, that hardness increase that can be connected with cracks. The aim of this research was to investigate the effects of different lasers and the process parameters on the form and level of residual stresses in the Ti6Al4V alloy, which determine the initiation and propagation of cracking. Two lasers were used, the CO2 and Nd:YAG lasers. The specimens were remelted in liquid nitrogen, water or calm air at different pre-heating temperature. The different laser power and scan rates were applied. The increase in energy density increased the number of cracks, the change of an environment and pre-heating affected alo the surface cracking. The cracks observed after remelting with Nd:YAG laser were longer than those observed after treatment with CO2 laser. The compressive stresses after the CO2 laser treatment, and tensile stresses after treatment with the Nd:YAG laser, were found. The appearance of cracks was attributed to an excessive energy density. The different distribution of heat energy inside and around the laser tracks was discussed as the origin of presence either tensile or compressive stresses in the alloy treated with different lasers.

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Effect of Crystallization Process at Cryogenic Conditions on the Functional Properties of the SUPERSTON Alloy Used in Production the Ship’s Propellers

Solid State Phenomena ◽

10.4028/www.scientific.net/ssp.183.111 ◽

2011 ◽

Vol 183 ◽

pp. 111-116

Author(s):

Beata Majkowska ◽

Waldemar Serbiński

Keyword(s):

Surface Layer ◽

Laser Treatment ◽

Functional Properties ◽

Crystallization Process ◽

Synergistic Effects ◽

Solidification Rate ◽

Cavitation Resistance ◽

Laser Remelting ◽

Modification Process ◽

Cryogenic Conditions

The purpose of this paper is to show results of laser treatment at cryogenic conditions of the SUPERSTON alloy used for ship’s propellers. That modification process ought to bring beneficial changes of microstructure and residual stresses in the surface layer. During the laser remelting at cryogenic conditions the microstructure changes significantly. This is related to synergistic effects of the solidification rate, phase transformations in the solid state and laser treatment parameters. That crystallization process had influence on functional properties such as corrosion and cavitation resistance of the SUPERSTON alloy which were tested during researches.

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Evaluation of the Bioactivity Behavior of a 48 Wt %SiO2 Bioglass through Experiments in Simulated Body Fluid

Materials Science Forum ◽

10.4028/www.scientific.net/msf.727-728.1238 ◽

2012 ◽

Vol 727-728 ◽

pp. 1238-1242 ◽

Cited By ~ 6

Author(s):

Roger Borges ◽

Antônio Carlos da Silva ◽

Juliana Marchi

Keyword(s):

Corrosion Resistance ◽

Surface Layer ◽

Simulated Body Fluid ◽

Body Fluid ◽

Glass Network ◽

In Vitro Experiments ◽

High Corrosion Resistance ◽

Before And After ◽

O 19

Among bioceramics materials, bioglasses which exhibits either a bioactive or resorbable behavior has been studied for many applications, such as bone substitutive and regeneration. When in contact with body fluid, the bioglasses can induce the formation of a hydroxyapatite surface layer. In this paper, we studied the bioactivity of a bioglass containing 48 wt %SiO2, 27 wt% Na2O, 19 wt % CaO and 6 wt %P2O5. After fusion and annealing, the samples were immersed in SBF for different periods, up to 14 days. The samples were characterized through XRD, DRIFT and SEM before and after bioactivity experiments. The overall results suggest the formation of a surface layer of consisting of hydroxyapatite, which was crystallized within seven days after in vitro experiments, leading to a suitable bioactivity. Moreover, the samples showed a glass network with high cohesion due to calcium addition, leading to materials with high corrosion resistance.

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