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

2011 ◽  
Vol 183 ◽  
pp. 215-224 ◽  
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.

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

2015 ◽  
Vol 60 (2) ◽  
pp. 755-758 ◽  
Author(s):  
B. Majkowska ◽  
M. Jażdżewska ◽  
E. Wołowiec ◽  
W. Piekoszewski ◽  
L. Klimek ◽  
...  
Keyword(s):  
Surface Layer ◽  
Simulated Body Fluid ◽  
Residual Stresses ◽  
Laser Treatment ◽  
Body Fluid ◽  
Ti6al4v Alloy ◽  
Surface Cracking ◽  
Modification Process ◽  
Orthopedic Applications ◽  
Cryogenic Conditions

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.

Cavitation Wearing of the SUPERSTON Alloy after Laser Treatment at Cryogenic Conditions

2010 ◽  
Vol 165 ◽  
pp. 306-309 ◽  
Author(s):  
Beata Majkowska ◽  
Waldemar Serbiński
Keyword(s):  
Electron Microscope ◽  
Scanning Electron Microscope ◽  
Laser Treatment ◽  
Cross Section ◽  
Base Material ◽  
Cavitation Resistance ◽  
Laser Remelting ◽  
Rotating Disc ◽  
Cryogenic Conditions ◽  
Scanning Electron

The purpose of this paper is to demonstrate the method of laser remelting at cryogenic conditions of the SUPERSTON alloy and its influence on microstructure and cavitation wearing. The cavitation test was performed using the rotating disc facility in IPM PAN Gdansk. During the cavitation test, the mass loss of the material with different parameters of laser remelting was determined. Surface and cross-section microstructure of the SUPERSTON alloy after laser treatment and cavitation test were observed by scanning electron microscope. The cavitation resistance of the remelted SUPERSTON alloy was approximately 40% higher in comparison to the base material.

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

2020 ◽  
Vol 20 (1) ◽  
pp. 82-90 ◽  
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.

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

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.

scholarly journals Impact of Laser Power and Firing Angle on Coagulation Efficiency in Laser Treatment for Twin-Twin Transfusion Syndrome: An ex vivo Placenta Study

2017 ◽  
Vol 42 (3) ◽  
pp. 204-209 ◽  
Author(s):  
Joost Akkermans ◽  
Loes van der Donk ◽  
Suzanne H.P. Peeters ◽  
Sjoerd van Tuijl ◽  
Johanna M. Middeldorp ◽  
...  
Keyword(s):  
Laser Treatment ◽  
Laser Power ◽  
Ex Vivo

scholarly journals Influence of the surface treatment of tire rubber residues added in mortars

2008 ◽  
Vol 1 (2) ◽  
pp. 113-120 ◽  
Author(s):  
A. C. Marques ◽  
J. L. Akasaki ◽  
A. P. M. Trigo ◽  
M. L. Marques
Keyword(s):  
Mechanical Properties ◽  
Aqueous Solution ◽  
Tensile Strength ◽  
Compressive Strength ◽  
Surface Treatment ◽  
Water Absorption ◽  
Modulus Of Elasticity ◽  
Tire Rubber ◽  
Flow Test ◽  
Made In

In this work it was evaluated the influence tire rubber addition in mortars in order to replace part of the sand (12% by volume). It was also intended to verify if the tire rubber treatment with NaOH saturated aqueous solution causes interference on the mechanical properties of the mixture. Compressive strength, splitting tensile strength, water absorption, modulus of elasticity, and flow test were made in specimens of 5cmx10cm and the tests were carried out to 7, 28, 56, 90, and 180 days. The results show reduction on mechanical properties values after addition of tire rubber and decrease of the workability. It was also observed that the tire rubber treatment does not cause any alteration on the results compared to the rubber without treatment.

scholarly journals Fatigue behaviour of modified surface of Ti6Al4V alloy by chemical surface treatment

2016 ◽  
Vol 4 ◽  
Author(s):  
Escobar Claros Cesar ◽  
Pedreira De Oliveira Diego ◽  
Campanelli Leonardo ◽  
Bolfarini Claudemiro
Keyword(s):  
Surface Treatment ◽  
Fatigue Behaviour ◽  
Ti6al4v Alloy ◽  
Chemical Surface ◽  
Modified Surface

Microstructural Development Due to Laser Treatment and Its Effect on Machinability of Ti6Al4V Alloy

2018 ◽  
Vol 49 (8) ◽  
pp. 3450-3467 ◽  
Author(s):  
Sagar V. Telrandhe ◽  
Bhagyaraj Jayabalan ◽  
Christ P. Paul ◽  
Sushil K. Mishra
Keyword(s):  
Laser Treatment ◽  
Ti6al4v Alloy ◽  
Microstructural Development

Penetration of a Rate Sensitive Geological Target by the Compaction Ring Theory

2002 ◽  
Author(s):  
Martin R. Gilmore ◽  
S. E. Jones ◽  
Joseph C. Foster
Keyword(s):  
Model Development ◽  
Target Material ◽  
Rate Sensitivity ◽  
Target Strength ◽  
Strain Rates ◽  
Linear Rate ◽  
Cat Scan ◽  
Strain And Strain Rate ◽  
Simplifying Assumptions ◽  
Made In

In an earlier paper, the authors presented a theory for the penetration of geologically based semi-infinite targets [5]. This theory was suitable for application to targets in which compaction due to the crushing of voids is the primary deformation mechanism. This phenomenon has been observed in concrete targets with a ring of dense material around the tunnel region, see figure 1 for a cat scan of a concrete target after penetration. This was the motivation for the model development. A number of simplifying assumptions were made in the application of the theory to data from concrete penetration experiments. One of the assumptions was that the target strength was constant, or independent of strain and strain rate. This assumption leads to generally consistent results for the same ogive nose geometry. However, it was noted that there was a discrepancy between the strength predictions when two different ogive nose geometries were used. This paper investigates the discrepancy by assuming that the target material is rate sensitive. The results indicate that the strain rates in the target are indeed affected by the nose geometry. A detailed analysis for a target material with linear rate sensitivity is provided in the paper and the results provide a favorable comparison with available experimental evidence.

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