Wear resistance of a bearing steel processed by laser surface remelting cooled by water

Purpose The purpose of this paper is to investigate the tribological effects of laser surface texturing (LST) and residual stress on functional surfaces. Design/methodology/approach Three different surface textures (circular dimple, elliptical dimple and groove) with two different textured area ratios (10 and 20 per cent) are designed and fabricated by a Picosecond Nd YAG Laser machine. The friction and wear performance of textured specimens is tested using a UMT-2 friction and wear testing machine in mixed lubrication. Findings Test results show that elliptical dimples exhibit the best performance in wear resistance, circular dimples in friction reduction and grooves in stabilization of friction. The surfaces with larger textured area density exhibit better performance in both friction reduction and wear resistance. The improved performance of LST is the coupled effect of surface texture and residual stress. Originality/value The findings of this study may provide guidance for optimal design of functional surface textures in reciprocating sliding contacts under mixed or hydrodynamic lubrication, which can be used in automotive and other industrial applications.

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Laser surface remelting of plasma sprayed nanostructured Al2O3–13wt%TiO2 coatings on titanium alloy

Applied Surface Science ◽

10.1016/j.apsusc.2009.06.033 ◽

2009 ◽

Vol 255 (20) ◽

pp. 8603-8610 ◽

Cited By ~ 51

Author(s):

Y. Wang ◽

C.G. Li ◽

W. Tian ◽

Y. Yang

Keyword(s):

Titanium Alloy ◽

Laser Surface ◽

Laser Surface Remelting ◽

Tio2 Coatings ◽

Plasma Sprayed

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Investigation of Laser Surface Remelting Supported by Acoustic Emission Analysis and Machine Learning

Metallurgical and Materials Transactions A ◽

10.1007/s11661-021-06552-7 ◽

2022 ◽

Author(s):

Dunja Ravnikar ◽

Bor Mojškerc ◽

Roman Šturm

Keyword(s):

Machine Learning ◽

Acoustic Emission ◽

Laser Surface ◽

Emission Analysis ◽

Laser Surface Remelting ◽

Acoustic Emission Analysis

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The Influence of Laser Irradiation Parameters on Tribological Behaviour of Commercially Pure Titanium for Dental Prostheses

Volume 14: Emerging Technologies; Materials: Genetics to Structures; Safety Engineering and Risk Analysis ◽

10.1115/imece2016-66524 ◽

2016 ◽

Author(s):

Karibeeran Shanmuga Sundaram ◽

Gurusami Kiliyappan ◽

Senthil Kumaran Selvadurai

Keyword(s):

Surface Roughness ◽

Wear Resistance ◽

Pure Titanium ◽

Laser Surface ◽

Commercially Pure Titanium ◽

Laser Shock ◽

Micro Hardness ◽

Dental Prostheses ◽

Commercially Pure ◽

Cp Ti

Laser shock peening (LSP) is one of the innovative technique that produces a compressive residual stress on the surface of metallic materials, thereby significantly increasing its fatigue life in applications where failure is caused by surface-initiated cracks. The specimens were treated with laser shock waves with different processing parameters, and characterization studies were made on treated specimens. The purpose of the present study was to investigate the influence of Nd:YAG laser on commercially pure titanium (CP-Ti) used in prosthetic dental restorations. The treatment influenced change in microstructure, micro hardness, surface roughness, and wear resistance characteristics. Though CP-Ti is considered as an excellent material for dental applications due to its outstanding biocompatibility, it is not suitable when high mastication forces are applied. In the present study, pulsed Nd:YAG laser surface treatment technique was adopted to improve the wear resistance of CP-Ti. The wear test pin specimens of CP-Ti were investment cast with centrifugal titanium casting machine. The wear properties of specimens were evaluated after LSP on a “pin-on-disc” wear testing tribometer, as per ASTM G99-05 standards. The results of the wear experiment showed that the treated laser surface has higher wear resistance, micro hardness, and surface roughness compared to as-cast samples. The improvement of wear resistance may be attributed due to grain refinement imparted by LSP processes. The microstructure, wear surfaces, wear debris, and morphology of the specimen were analyzed by using optical electron microscope, scanning electron microscope, and X-ray diffraction (XRD). The data were compared using ANOVA and post-hoc Tukey tests. The characteristic change resulted in increase in wear resistance and decrease in wear rate. Hence, it is evident that the more reliable and removable partial denture metal frameworks for dental prostheses may find its applications.

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