Laser Shock Surface Patterning of Steel and Aluminum Contact Surfaces and its Effect on Tribological Properties

Abstract We report a novel laser-based surface processing process, laser shock surface patterning (LSSP) integrating both surface strengthening and patterning effects might lead to broader impacts in tribology research and applications. This process utilizes the laser-induced shockwave loadings to introduce the surface strengthening and patterning effects simultaneously, leading to the fabrication of arrays of micro-indentations or protrusions for the enhanced wear resistance and manipulated friction values. Two process designs, direct-LSSP and indirect-LSSP were proposed and carried out on AZ31B Mg alloys and AISI 1045 steels, respectively. The 3D surface profiles of the samples after LSSP were characterized. The hardness of surface patterns prepared by laser processing was measured. The friction values as affected by laser processing parameters were measured by sliding tests. The relationships among laser processing parameters, micro-feature characteristics, and COF were discussed.

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Nonlinear surface wave measurements on aged and laser shock surface-treated Inconel 718 superalloy

NDT & E International ◽

10.1016/j.ndteint.2021.102457 ◽

2021 ◽

Vol 121 ◽

pp. 102457

Author(s):

Vania M. Rodríguez-Herrejón ◽

Alberto Ruiz ◽

Carlos Rubio-González ◽

Víctor H. López-Morelos ◽

Jin-Yeon Kim ◽

...

Keyword(s):

Surface Wave ◽

Inconel 718 ◽

Laser Shock ◽

Shock Surface ◽

Wave Measurements ◽

Inconel 718 Superalloy ◽

Nonlinear Surface

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Optical brake induced by laser shock waves

Journal of Nonlinear Optical Physics & Materials ◽

10.1142/s0218863520500101 ◽

2021 ◽

pp. 2050010

Author(s):

Qiao Kang ◽

Dongyi Shen ◽

Jie Sun ◽

Xin Luo ◽

Wei Liu ◽

...

Keyword(s):

Shock Wave ◽

Shock Waves ◽

Optical Method ◽

Close Contact ◽

Surface Friction ◽

Laser Shock ◽

Free Standing ◽

Friction Forces ◽

Optical Levitation ◽

Contact Surfaces

We demonstrate an optical method to modify friction forces between two close-contact surfaces through laser-induced shock waves, which can strongly enhance surface friction forces in a sandwiched confinement with/without lubricant, due to the increase of pressure arising from excited shock waves. Such enhanced friction can even lead to a rotating rotor’s braking effect. Meanwhile, this shock wave-modified friction force is found to decrease under a free-standing configuration. This technique of optically controllable friction may pave the way for applications in optical levitation, transportation, and microfluidics.

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Synthesis and Lubrication Characteristics of Aryloxycyclophosphazenes Substituted With Imidazolium

Journal of Tribology ◽

10.1115/1.3118786 ◽

2009 ◽

Vol 131 (3) ◽

Cited By ~ 2

Author(s):

Jinlong Li ◽

Feng Zhou ◽

Dapeng Feng ◽

Yanqiu Xia ◽

Weimin Liu

Keyword(s):

Ionic Liquids ◽

Tribological Properties ◽

Friction And Wear ◽

Ambient Condition ◽

Wear Volume ◽

Tribochemical Reaction ◽

Lubricating Film ◽

Strong Adsorption ◽

Contact Surfaces ◽

Lubrication Characteristics

A series of new aryloxycyclophosphazene derivatives substituted with imidazolium ionic liquids was synthesized. Their tribological properties were investigated on an Optimol SRV IV oscillating friction and wear tester in ambient condition. An electric field was imposed between the ball and disk to monitor the tribochemical reaction by means of “contact resistance.” These ionic liquids substituted cyclophosphazene derivatives present lower friction coefficient and wear volume loss than tetrakis-(3-trifluoromethylphenoxy)-bis(4-fluorophenoxy)cyclotriphosphazene. The polarity of ionic liquids is believed to provide strong adsorption to contact surfaces and can form a boundary lubricating film leading to friction and wear reductions. Introducing the ionic liquids to cyclophosphazene may be a new method to improve the tribological properties of cyclophosphazene derivatives.

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Effect of laser shock peening and carbonitriding on tribological properties of 20Cr2Mn2Mo steel alloy under dry sliding conditions

Surface and Coatings Technology ◽

10.1016/j.surfcoat.2021.127215 ◽

2021 ◽

Vol 417 ◽

pp. 127215

Author(s):

Yunpeng Ren ◽

Hanyu Wan ◽

Yan Chen ◽

Hao Zhu ◽

Heng Lu ◽

...

Keyword(s):

Tribological Properties ◽

Laser Shock Peening ◽

Dry Sliding ◽

Steel Alloy ◽

Laser Shock ◽

Shock Peening

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

ASME/STLE 2009 International Joint Tribology Conference ◽

10.1115/ijtc2009-15113 ◽

2009 ◽

Cited By ~ 1

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.

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