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.

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 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.

Fatigue Life Recovery via Laser Shock Peening in Mechanically Damaged Aluminium Sheet; Experiments and Prediction Models

2014 ◽  
Vol 891-892 ◽  
pp. 980-985 ◽  
Author(s):  
Niall Smyth ◽  
Philip E. Irving
Keyword(s):  
Residual Stress ◽  
Fatigue Life ◽  
Prediction Models ◽  
Load Cycle ◽  
Laser Shock Peening ◽  
Stress Fields ◽  
Hole Drilling ◽  
Laser Shock ◽  
Aluminium Sheet ◽  
Shock Peening

This paper reports the effectiveness of residual stress fields induced by laser shock peening (LSP) to recover pristine fatigue life. Scratches 50 and 150 μm deep with 5 μm root radii were introduced into samples of 2024-T351 aluminium sheet 2 mm thick using a diamond tipped tool. LSP was applied along the scratch in a band 5 mm wide. Residual stress fields induced were measured using incremental hole drilling. Compressive residual stress at the surface was-78 MPa increasing to-204 MPa at a depth of 220 μm. Fatigue tests were performed on peened, unpeened, pristine and scribed samples. Scratches reduced fatigue lives by factors up to 22 and LSP restored 74% of pristine life. Unpeened samples fractured at the scratches however peened samples did not fracture at the scratches but instead on the untreated rear face of the samples. Crack initiation still occurred at the root of the scribes on or close to the first load cycle in both peened and unpeened samples. In peened samples the crack at the root of the scribe did not progress to failure, suggesting that residual stress did not affect initiation behaviour but instead FCGR. A residual stress model is presented to predict crack behaviour in peened samples.

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
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