Friction and Wear Study of Laser Surface Textured Ti-6Al-4V Against Cast Iron and Stainless Steel Using Pin-on-Disc Tribometer (original) (raw)
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Friction Evaluation of Laser Textured Tool Steel Surfaces
Acta Mechanica et Automatica, 2017
Surface textures can be defined as a regularly arranged micro-depressions or grooves with defined shape and dimensions. These textures, if they are manufactured by laser ablation process, contribute to a significant improvement of the tribological, optical or various biological properties. The aim of this paper is to analyze the influence of the surface textures prepared by laser surface texturing (LST) at the friction coefficient value measured on the tool (90MnCrV8 steel) – workpiece (S235JRG1 steel) interface. Planar frontal surfaces of compression platens have been covered by parabolic dimple-like depressions with different dimensions. The morphological analysis of such manufactured depressions has been performed by laser scanning microscopy. Influence of such created textures on the tribological properties of the contact pair has been analyzed by the ring compression test method in the terms of hydrodynamic lubrication regime. The experimental research shown that by applying of...
Experimental study on laser surface texturing and wear characterization of titanium alloy
Creation of micro grooves, micro features, and micro textures in required dimensions are easily obtained by laser assisted micromachining technologies. This study focused to investigate the wear characterization of micro-textured Ti-3Al-2.5V alloy. Initially, surface textures were formed on the Ti alloy surfaces by fiber lasers. Surface textured specimens were subjected to wear studies in pin on disc tribometer to estimate the wear resisting capacity. Optical microscopy and 3D optical spectroscopy were used to analyze the waviness of the surface textures. After detailed texturing studies, the specimen is used for testing wear characterization which is done under dry sliding conditions. Load is the important characteristics which is followed by velocity and distance slide over the surface. SEM is used to investigate the details of structure and wear performance of the titanium alloy. The wavy laser surface texturing has greater impact on the wear resistance capabilities.
Journal of Central South University, 2018
A pulsed, picosecond Nd:YAG laser with a wavelength of 532 nm is used to texture the surface of grade 5 titanium alloy (Ti-6Al-4V) for minimizing its wear rate. The wear properties of the base samples and laser surface textured samples are analyzed by conducting wear tests under a sliding condition using pin-on-disk equipment. The wear tests are conducted based on the Box-Benhken design, and the interaction of the process parameters is analyzed using response surface methodology. The wear analysis is conducted by varying the load, rotating speed of the disc, and track diameter at room temperature with a sliding distance of 1500 m. The results demonstrate that the laser textured surfaces exhibited a lower coefficient of friction and good anti-wear properties as compared with the non-textured surfaces. A regression model is developed for the wear analysis of titanium alloy using the analysis of variance technique. It is also observed from the analysis that the applied load and sliding distance are the parameters that have the greatest effect on the wear behavior followed by the wear track diameter. The optimum operating conditions have been suggested based on the results obtained from the numerical optimization approach.
Friction and wear characteristics modification via laser surface textured grooves
Surface Engineering, 2020
The commensurate contact condition plays a key role in the directional friction properties and wear performance when two surfaces slide against each other. An experimental study on bidirectional friction and wear control by nanosecond pulsed laser selective texturing of grooves on AISI 304 stainless steel (SS) and TA2 titanium (Ti) surfaces of the sliding components was proposed. The influence of the aspect ratio (AR) and groove orientation angle on directional friction properties and wear performance was investigated. The AR 2 and 75°samples performed best with 68.13 and 21.71% overall average coefficient of friction reduction for the Ti-Ti and SS-SS interfaces, respectively. The AR 5.5 generated the least wear for the Ti-Ti and SS-SS pairs. The results take us a step closer to deriving a more effective, accurate, and dependable guideline for designing laser-machined surface grooves for directional sliding friction control.
Metals, 2022
Surface texturing is used in many applications to control the friction and wear behaviour of mechanical components. The benefits of texture design on the tribological behaviour of conformal surfaces are well known. However, there is a big dependency between the geometrical features of the texture and the texture’s performance. In this paper, the effect of laser texturing parameters on textured geometrical features is studied, as well as its role in the tribological behaviour of AISI 630 steel under lubrication and high-contact pressure conditions. The results show a linear impact of the energy density on the surface quality, whereas the scanning speed influences the homogeneity of the sample. Nevertheless, the surface integrity is also affected by the laser parameters, reducing the micro-hardness on the textured area by up to 33%. Friction coefficient average values and stability presented high variations depending on the sample parameters. Finally, the wear mechanisms were analysed...
On Design and Tribological Behaviour of Laser Textured Surfaces
Procedia CIRP
The paper reports an investigation into the functional response of textured surfaces with different designs that incorporated arrays of microdimples and grooves (40μm diameter/width and 15μm depth for both patterns) produced on tungsten carbide (WC) blocks by employing nanosecond (ns) and femtosecond (fs) lasers. In particular, the tribological performance of the textured WC blocks against stainless steel (SS316L) counterbody was evaluated in terms of friction and wear under dry condition compared to an untextured specimen. Friction tests were carried out on a reciprocating sliding tester while unidirectional ball-on-disc method was utilised to assess wear on the mating surfaces. The untextured surface exhibited a continuous rise in the friction coefficient from 0.15 to 0.5 from the start of the cycle to the end while the specimens textured with ns and fs lasers reached steady-state condition after 100 and 200 cycles with values between 0.35-0.45 and 0.3-0.4, respectively. Energy dispersive spectroscopy following wear tests showed a pronounced material transfer from the balls to the textured surfaces with stainless steel filling up some of the dimple and groove cavities; however, the reverse phenomenon was not apparent. Additionally, texturing with the fs laser exhibited formation of nano-ripples/structures in the produced dimples and grooves that can be further studied for creating nano-textured cutting tools or surfaces with super-hydrophobic/anti-ice properties.
Friction and wear behavior of laser textured surface under lubricated initial point contact
Wear, 2011
Laser surface texturing (LST) by dimpling has been shown analytically and experimentally to enhance mixed, hydrodynamic, and hydrostatic lubrication of conformal sliding components. Improvements such as higher load-carrying capacity, higher wear resistance, and lower friction coefficients were observed in LST mechanical seals and thrust bearings. However, under non-conformal concentrated contact, the dimpled surface may have a different effect on the tribological behavior as a result of increased roughness, which may increase abrasive wear on the counterface. This paper discusses the effect of laser-textured surfaces on the tribological properties under a point ball-on-flat contact configuration. Tribological experiments were performed with dimpled flats in a pin-on-disk friction machine at speeds from 0.015 to 0.75 m/s using oils with different viscosity. Disks with dimples having different depths and densities were evaluated. Results showed that disks with higher dimple density produced more abrasive wear on the ball specimen. However, this higher wear rate led to faster generation of conformal contacts and a transition from the boundary to mixed lubrication regime, resulting in a rapid reduction in the friction coefficient with increased ball wear. The wear rate was higher in tests with lower viscosity oils, as expected. Results of the study may be beneficial for optimization of LST technology for industrial application in friction units.
Surface treatment of titanium by laser irradiation to improve resistance to dry-sliding friction
Wear, 1999
This experimental study was performed with intent to improve the surface properties of titanium and to minimize the friction on ceramic. Its main object was to strengthen the resistance against wear resulting from dry-sliding contact. Titanium-covered or not, graphite powder was irradiated and superficially melted by means of a pulsed Nd-YAG laser beam. Different irradiations were carried out, changing the distance between irradiated surface and laser beam focal plane. The variations in the dry-sliding friction coefficient were recorded using a pin-on-disc tribometer. An optimum irradiation of graphite-covered titanium generated hard granular titanium carbide and lubricating graphite inclusions which drastically reduced dry friction and wear of the Laser-Melted Zone. In this way, a self-lubricating composite coating has been successfully synthesized on titanium from the laser melting process. q 1999 Elsevier Science S.A. All rights reserved.
Single step laser surface texturing for enhancing contact angle and tribological properties
The International Journal of Advanced Manufacturing Technology, 2018
Surface texturing is a process of inducing specific patterns on a surface to enhance the performance of the surface in its working environment. The arrays of patterns can be either micro-scale, nano-scale, or its combination. In general, micro-texturing of a surface regulates the surface energy and contact angle (CA), which can lead to hydrophobicity and improved tribological properties to the surface. Laser surface texturing process (direct write method) is one of the best suitable processes for producing micro-patterns because of its better accuracy, repeatability, and machining rate over the advanced machining processes (electric discharge machining, electrochemical micro-machining, etc.). In the present work, an attempt has been made to produce microtextures on polymeric as well as metallic surfaces using CO 2 laser and solid-state pulsed ytterbium fiber laser respectively. An experimental analysis is executed to understand how CA and coefficient of friction (COF) depend on substrate's surface topography and areal density of the texture. Various polymeric and metal surfaces such as Kapton, Mylar™ (polyethylene terephthalate or PET), cellulose acetate film, titanium alloy (Ti6Al4V), and stainless steel (SS304) are laser textured by producing various micro-patterns such as array of micro-pillars of the square and triangular cross section, and micro-dimples. A novel study of the influence of areal density of textures on the coefficient of friction and wear is performed to signify the applicability of the textured surfaces. Textures of 32, 140, and 670 pillars/mm 2 areal densities are machined and tested through fretting wear test. In Ti6Al4V, texture with (30 μm pillar width) areal density 640 pillars/mm 2 leads to lowest COF and highest contact angle of 140°.
2015
In the present study, a detailed characterization of laser-assisted surface textured titanium alloy (Ti–6Al–4V) has been undertaken. Laser surface texturing with line and dimple geometry has been carried out using ArF excimer laser operating at a wavelength of 193 nm with a pulse length of 5 ns. Following surface texturing, an extensive characterization of the textured surface has been carried out by scanning electron microscopy, electron back scattered diffraction (EBSD) and X-ray diffraction technique. There is refinement of microstructure along with a higher mass -titanium phase and oxides of titanium (rutile, anatase and few Ti2O3 phase) in the textured surface as compared to as-received one. Furthermore, in order to investigate the impact of laser surface texturing on surface energy; wettability studies have been carried out before and after laser modification. The area fractions of linear texture and dimple texture measured by image analysis software were 45 % and 20 %, respec...