Fabrication and Tribological Functions of Micro Dent Arrays on Ti-6Al-4V Surface by Laser Shock Peening

2014 ◽  
Author(s):  
R. Caslaru ◽  
Y. B. Guo ◽  
X. T. Wei
Keyword(s):  
Friction And Wear ◽  
Acoustic Emissions ◽  
High Viscosity ◽  
Rolling Contact ◽  
Friction Reduction ◽  
Laser Shock Peening ◽  
Laser Shock ◽  
On Line ◽  
Shock Peening ◽  
Enhanced Surface

Surface patterning has become a valuable technique for fabricating micro dents which may act as lubricant reservoirs to reduce friction and wear in sliding and rolling contact applications. In this paper, the use of laser shock peening (LSP) along with an automatic X-Y table proves to be an attractive and reliable method for producing micro dent arrays with enhanced surface integrity. Surface topography and profiles of the fabricated micro dent arrays on polished Ti-6Al-4V have been characterized. The effect of dent arrays with different density on friction reduction at low and high viscosity lubrication was investigated. An acoustic emission (AE) sensor was used to on-line monitor friction and wear processes. It was found that a surface with 10% dent density provides better effect in reducing coefficient of friction (CoF) than those of smooth surface and a surface with 20% dent density. It was shown that there is a strong correlation between acoustic emissions (AE) signals, especial AE cumulative counts and wear rate.

Fabrication and Tribological Functions of Microdent Arrays on Ti–6Al–4V Surface by Laser Shock Peening

2014 ◽  
Vol 136 (5) ◽  
Author(s):  
R. Caslaru ◽  
M. P. Sealy ◽  
Y. B. Guo ◽  
X. T. Wei
Keyword(s):  
Friction And Wear ◽  
High Viscosity ◽  
Surface Patterning ◽  
Rolling Contact ◽  
Friction Reduction ◽  
Laser Shock Peening ◽  
Laser Shock ◽  
Shock Peening ◽  
Enhanced Surface ◽  
Online Monitor

Surface patterning has become a valuable technique for fabricating microdents, which may act as lubricant reservoirs to reduce friction and wear in sliding and rolling contact applications. In this paper, the use of laser shock peening (LSP) along with an automatic X–Y table proves to be an attractive and reliable method for producing microdent arrays with enhanced surface integrity. Surface topography and profiles of the fabricated microdent arrays on polished Ti–6Al–4V have been characterized. The effect of dent arrays with different density on friction reduction at low and high viscosity lubrication was investigated. An acoustic emission (AE) sensor was used to online monitor friction and wear processes. It was found that a surface with 10% dent density provides better effect in reducing coefficient of friction (CoF) than those of smooth surface and a surface with 20% dent density. It was shown that there is a strong correlation between AE energy signals and wear rate.

The Effect of Micro Dent Arrays Fabricated by Laser Shock Peening on Tribology

2009 ◽  
Author(s):  
R. Caslaru ◽  
Y. B. Guo
Keyword(s):  
Coefficient Of Friction ◽  
Smooth Surface ◽  
Friction And Wear ◽  
Surface Patterning ◽  
Rolling Contact ◽  
Laser Shock Peening ◽  
Alternative Methods ◽  
Laser Shock ◽  
Shock Peening ◽  
Enhanced Surface

Surface micro dents may act as lubricant reservoirs to reduce friction and wear in sliding and rolling contact applications. Surface patterning has become a valuable technique for fabricating micro dents. Alternative methods such as micromachining present obvious limitations in comparison with laser shock peening (LSP). In this paper, the use of LSP along with an automatic X-Y table proves to be an attractive and reliable method for producing micro dent arrays with enhanced surface integrity and free of cracks. Surface topography, residual stress, and microhardness of the fabricated micro dent arrays on polished Ti-6Al-4V have been characterized. It was found that a 10% density of micro dent array reduces coefficient of friction compared with a smooth surface. However, a higher dent density not necessarily reduces coefficient of friction.

Fabrication and Characterization of Micro Dent Arrays by Laser Shock Peening on Ti-6Al-4V Surfaces

2009 ◽  
Author(s):  
R. Caslaru ◽  
Y. B. Guo ◽  
M. P. Sealy
Keyword(s):  
Residual Stress ◽  
Friction And Wear ◽  
Rolling Contact ◽  
Laser Shock Peening ◽  
Alternative Methods ◽  
Laser Shock ◽  
Shock Peening ◽  
Enhanced Surface ◽  
Center Area

Surface micro dents may act as lubricant reservoirs to reduce friction and wear in sliding and rolling contact applications. Surface patterning has become a valuable technique for fabricating micro dents. Alternative methods such as micromachining present obvious limitations in comparison with laser shock peening (LSP). In this paper, the use of LSP along with an automatic X-Y table proves to be an attractive and reliable method for producing micro dent arrays with enhanced surface integrity and free of cracks. Surface topography, residual stress, and microhardness of the fabricated micro dent arrays on polished Ti-6A1-4V have been characterized. It has shown that LSP is capable of efficiently fabricating mass micro dent arrays with controllable size. The center area of the peened dents has highest hardness. In addition, high compressive residual stress can also be created.

Friction and Wear Properties of H62 Brass Subjected to Laser Shock Peening

2018 ◽  
Vol 38 (10) ◽  
pp. 1014002
Author(s):  
段海峰 Duan Haifeng ◽  
罗开玉 Luo Kaiyu ◽  
鲁金忠 Lu Jinzhong
Keyword(s):  
Friction And Wear ◽  
Laser Shock Peening ◽  
Laser Shock ◽  
Wear Properties ◽  
Friction And Wear Properties ◽  
Shock Peening

Friction and wear on laser textured Ti6Al4V surface subjected to laser shock peening with contacting foil

2018 ◽  
Vol 103 ◽  
pp. 142-150 ◽  
Author(s):  
F.Z. Dai ◽  
J. Geng ◽  
W.S. Tan ◽  
X.D. Ren ◽  
J.Z. Lu ◽  
...  
Keyword(s):  
Friction And Wear ◽  
Laser Shock Peening ◽  
Laser Shock ◽  
Shock Peening

Effect of Laser Glazing and Laser Shock Peening on Tribological Performance of 1080 Carbon Steel

2004 ◽  
Author(s):  
Saud Aldajah ◽  
Oyelayo O. Ajayi ◽  
George R. Fenske ◽  
Claude B. Reed ◽  
Zhiyue Xu
Keyword(s):  
Carbon Steel ◽  
High Power ◽  
Friction Reduction ◽  
Laser Shock Peening ◽  
Laser Shock ◽  
High Power Laser ◽  
Laser Glazing ◽  
Power Laser ◽  
Microstructure And Properties ◽  
Shock Peening

High-power laser surface treatments in the form of glazing, shock peening, cladding, and alloying can significantly affect material tribology. In this paper, effects of laser glazing, laser shock peening, and their combination on the tribological behavior of 1080 carbon steel were investigated. Laser glazing is a process in which a high-power laser beam melts the top layer of the surface, followed by rapid cooling and resolidification. This results in a new surface layer microstructure and properties. Laser shock peening, on the other hand, is a mechanical process in which a laser generates pressure pulses on the surface of the metal, similar to shot peening. Five conditions were evaluated: untreated (baseline), laser shock peened only (PO), laser-glazed only (GO), laser-glazed then shock peened last (GFPL), and laser shock peened then glazed last (PFGL). In pin-on-disc testing, all laser-treated surfaces reduced dry friction, with the GFPL surface having maximum friction reduction of 43%. Under lubricated conditions, all laser-treated surfaces except the PO sample lowered friction. Similarly, all glazed samples reduced wear by a factor of 2–3, while the PO sample did not change wear significantly. These tribological results are associated with changes in the near-surface microstructure and properties.

A new acoustic emission on-line monitoring method of laser shock peening

Optik ◽  
2020 ◽  
Vol 205 ◽  
pp. 163578 ◽  
Author(s):  
Jiajun Wu ◽  
Jibin Zhao ◽  
Hongchao Qiao ◽  
Boyu Sun ◽  
Ying Lu
Keyword(s):  
Acoustic Emission ◽  
Laser Shock Peening ◽  
Laser Shock ◽  
Monitoring Method ◽  
On Line ◽  
Shock Peening
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