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Optimization of Surface Properties of Shot Peened TI6AL4V Alloy

100%
Yıldıran Y., Avcu E., Sınmazçelik T.
Acta Physica Polonica A
|
2015
|
vol. 127
|
issue 4
984-986
EN
As an important surface treatment method, shot peening (SP) is widely used in automotive and aerospace industries in order to improve surface properties. In the present study SP was performed on the α-β titanium alloy Ti6Al4V under various parameters (particle impingement angle, particle acceleration pressure and particle size) by using a specially designed shot peening test rig. It is aimed to optimize surface roughness and hardness of the shot peened Ti6Al4V alloy under various parameters. In order to achieve this goal shot peened samples were investigated in detail by using a non-contact laser optical profilometer and surface hardness of the samples was measured by using a micro-hardness instrument. The surface roughness values, 3D surface morphologies and micro-hardness of the samples were obtained and examined. The results show that particle impingement angle, particle acceleration pressure and particle size dramatically affect the surface properties of the Ti6Al4V alloy.
2
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Investigation of the Effects of Erosion Test Parameters on the Particle Impengement Velocity by Using CFD Analysis

100%
Önen B., Yıldıran Y., Avcu E., Çınar A.
Acta Physica Polonica A
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2015
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vol. 127
|
issue 4
1225-1229
EN
Particle impingement velocity is one of the most important parameters in solid particle erosion. Particle impingement velocity depends on erosion test parameters such as particle acceleration pressure, erodent particle size and standoff distance. Over the past decades many experimental studies have been conducted to examine the effects of these parameters on the particle impingement velocity. In this study, the effects of particle acceleration pressure, erodent particle size and standoff distance on the particle impingement velocity have been investigated by using a computational fluid dynamics (CFD) program, FLUENT. In order to achieve these goals solid particle erosion tests are simulated under various test parameters and the effects of these parameters are examined in detail. The effect of particle velocity on the flow field is characterized with method geometrics. Two-dimensional plane symmetrical models are utilized to reduce the computation time. Plots of gas pressure and particle velocity contours at the XY symmetrical plane from nozzle inlet to substrate were given. CFD analysis showed that all erosion test parameters have dramatically affected particle impingement velocity. Particle impingement velocity was increased with increases in acceleration pressure while it was decreased with increases in both erodent particle size and standoff distance.
3
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Influences of Particle Impingement Angle and Velocity on Surface Roughness, Erosion Rate, and 3D Surface Morphology of Solid Particle Eroded Ti6Al4V Alloy

88%
Avcu E., Yıldıran Y., Şahin A., Fidan S., Sınmazçelik T.
Acta Physica Polonica A
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2014
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vol. 125
|
issue 2
541-543
EN
In this study, it is aimed to investigate the effects of particle impingement angle and velocity on the surface roughness, erosion rate, and surface morphology of solid particle eroded Ti6Al4V alloy. Ti6Al4V samples were eroded in erosion test rig under various particle impingement angles (15°, 30°, 45°, 60°, 75° and 90°) and impingement velocities (33 m/s, 50 m/s, and 75 m/s) by using 120 mesh garnet erodent particles. Subsequently, erosion rates and surface roughness values of samples were analyzed and calculated as a function of particle impingement angle and velocity. Moreover, 3D surface morphologies of the eroded samples were prepared by using high definition scanner and image processing programs. Results show that erosion rates, surface roughness values and surface morphologies of Ti6Al4V alloy have been varied significantly depending on the both particle impingement angle and velocity. Erosion rates of Ti6Al4V alloy were decreased with increases in particle impingement angle; on the other hand, the surface roughness values were increased with increases in particle impingement angle. Both erosion rates and surface roughness values were increased with increases in particle impingement velocity. Finally, the surface morphologies of the eroded samples were evaluated deeply. It is concluded that the surface morphology variation of the Ti6Al4V alloy depending on the particle impingement angle and velocity were well correlated with the erosion rates and the surface roughness values.
4
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Effect of Particle Impact Angle, Erodent Particle Size and Acceleration Pressure on the Solid Particle Erosion Behavior of 3003 Aluminum Alloy

76%
Yıldıran Y., Avcu E., Şahin A., Fidan S., Yetiştiren H., Sınmazçelik T.
Acta Physica Polonica A
|
2014
|
vol. 125
|
issue 2
523-525
EN
This study aims to examine solid particle erosion behavior of 3003 aluminum alloy. 3003 aluminum alloy samples were eroded in erosion test rig under various particle impingement angles (15°, 30°, 45° and 60°) and acceleration pressures (1.5, 3 and 4 bar) by using 80 mesh and 180 mesh sized erodent particles (garnet). The erosion rates of aluminum alloy samples were calculated depending on the erosion parameters. The erosion rates of the samples have varied dramatically depending on particle impingement angle, acceleration pressure and erodent particle size. The maximum erosion rates were observed at 15° impingement angles at all acceleration pressures and particle sizes. Moreover, erosion rates of the samples were increased with increases in acceleration pressure at all particle impingement angles and particle sizes. On the other hand, erosion rates of the samples decrease with increase in erodent particle sizes. Hence, maximum erosion was observed when the aluminum alloy eroded at 15° impingement angle and 4 bar pressure by using 180 mesh erodent particles. Finally, the eroded surfaces of the samples were analyzed by using scanning electron microscope. The surfaces of the samples were also investigated by using energy dispersive X-ray analysis in scanning electron microscopy studies. Microcutting and microploughing erosion mechanisms were observed at 15° and 30° impingement angles, while deep cavities and valleys formed due to plastic deformation were observed at 45° and 60° impingement angles. Moreover, embedded erodent particles were clearly detected on the surfaces of the samples by energy dispersive X-ray analysis.
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