This study investigates the improvement of tribological properties of TB6 (Ti-10V-2Fe-3Al) alloys through laser surface texturing. It examines the effects of laser scanning cycles (LSCs) and dimple ...spacing (DS) on the water contact angle and the coefficient of friction (CoF) under both dry friction and starved-oil lubrication conditions. Dimple-textured surfaces reduce wear and friction by decreasing the actual contact area between the friction pairs, preventing wear particle entrapment, and enhancing oil retention, thereby leading to stable oil films. The optimal LSCs and DSs significantly reduce the CoF by up to 66 % under dry friction conditions and by 61 % under starved-oil lubrication conditions, compared to original surfaces. Surfaces with increased LSCs and decreased DSs become superhydrophobic after octadecyltrichlorosilane modification.
The frictional behaviour of plane converging bearings was experimentally and numerically studied for four texture geometries fabricated by ultra-short pulse laser texturing (single pocket, line-, ...cross- and dot-like texture) and convergence ratios under full-film lubrication in the presence of thick oil films (up to 100 μm). Regarding the experiments, small variations in the spread of results between different textures and a general improvement over the untextured reference can be observed. Numerical simulations help to clarify the expected variations and conditions under which these occur. For high convergences, the simulations demonstrated that textures are beneficial for friction reduction, regardless of load and relative texture's position. For low convergences, a significant friction reduction occurs for textures being located at the bearing's inlet.
•Four surface textures were fabricated via ultra-short pulse laser processing.•Textures were experimentally and numerically studied under thick full-film lubrication.•For high convergence ratios, textures are beneficial regardless of load and position.•For low convergences, friction reduction for textures at the inlet was observed.
Theoretical study on surface texturing methods: a review Mateescu, Geanina-Mihaela; Rădulescu, Alexandru Valentin; Teleașă, Andreea-Mirela
Journal of Research and Innovation for Sustainable Society,
11/2023, Letnik:
5, Številka:
2
Journal Article
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This paper presents the main texturing methods of metal surfaces, from the perspective of existing studies. This article explores different surface texturing methods and techniques, with an emphasis ...on using them to improve mechanical and tribological properties. Through a comprehensive analysis, the article addresses traditional texturing techniques as well as emerging technologies. In addition, the benefits and limitations of each method are highlighted, and recent articles in the field are reviewed to provide a complete picture of current developments in surface texturing
•Homogeneous surface structuring over large area.•2D-LIPSS fabricated on steel.•Interpulse delay effect on structure morphology.•Novel insight on structure formation.•Industrial femtosecond laser ...processing.
Laser surface texturing is an established way to introduce surface functionalities on solid surfaces. By means of femtosecond laser sources, it’s possible to texture a variety of solids such as metals, semiconductors and transparent materials, introducing features of different symmetry and size. Fabrication of laser induced periodic surface structure (LIPSS) which typically range in the near-submicron length scale can lead to strong modifications of surface wetting, tribological and optical properties. Controlling LIPSS morphology could enable us to mimic functional textures found in nature, introducing functionalities such as antireflectivity and bactericidity. Several works demonstrate the impact of polarization control and double-pulse irradiation on determining texture symmetry and size. Here we present a comprehensive study on controlling laser induced structures by double femtosecond pulse irradiation. The effect of pulse polarization and interpulse delay is elucidated and the generation of novel 2D surface morphologies is reported. A plausible interpretation of the structure formation mechanism is proposed in the frame of non-linear convection flow. A high average power industrial femtosecond laser source with a pulse duration of 350 fs operating at high repetition rate was employed for the experiments. Large areas were processed by combining different 2D morphologies generating a holographic pattern. We believe that our results provide a novel insight in controlling laser induced submicron morphology. Moreover, the presented surface texturing process is scalable in terms of processed area and cycle time and fully compatible with high repetition rates, demonstrating for the first time the feasibility to introduce double-pulse processing in an industrial environment.
Laser surface texturing is an effective method to enhance gear lubrication by improving lipophilic properties, thereby increasing transmission performance and longevity. This study investigated the ...effects of laser parameters on lipophilicity using a grid texture and found that a scanning speed of 100 mm/s maximized diffusion and climbing. The textured specimens showed higher wetting hysteresis and adsorption, forming a thicker oil film for better lubrication. Wear tests indicated that the textured specimen had reduced friction, wear quality, and depth by 49.2% and 66.34% compared to unprocessed specimens. Gear efficiency is effectively increased, and gear oil temperature is significantly reduced. This research offers insights into lipophilic characterization and gear lubrication enhancement, potentially decreasing surface failures like pitting, adhesion, and wear.
•A method for characterizing the lipophilicity of material surfaces is proposed.•Maximum wettability and adsorption force increased by 49.2% and 66.34% over US.•Minimum wear quality and depth decreased by 29.65% and 45.33% compared to US.•Textured gears increase efficiency > 3.67%, reduce oil temp > 7.45% vs. untextured.
The effectiveness of dimple surface texturing via picosecond pulsed laser processing for reducing wear loss was investigated using two types of titanium alloys, β-type Ti–29Nb–13Ta-4.6Zr (TNTZ) and ...α+β-type Ti–6Al–4V ELI (Ti64). The two alloys showed different modes of wear against zirconia. As the sliding distance increased, the wear loss was observed to increase for Ti64, but not necessarily for TNTZ. The wear debris of Ti64 acted as abrasive particles, but that of TNTZ easily adhered to the surface, and the adhered wear debris turned into a hard wear-protective layer. Therefore, the dependence of wear loss on the sliding distance for these two titanium alloys could be attributed to the difference in the roles of wear debris between each titanium alloy and zirconia. Further, depending on this difference in wear mode, the effect of dimple surface texturing on the wear was found to be different in Ti64 and TNTZ. As the dimples can trap the wear debris, they are effective for reducing wear in Ti64 but are detrimental in TNTZ.
•Surface texturing by pulsed laser processing for reducing wear loss was investigated•Two types of Ti alloys exhibited different wear modes against zirconia•Dependence of wear loss of the alloys on sliding distance was observed•The dimple surface texturing effect depended on the wear mode
Surface texturing is a surface modification approach, resulting in an improvement in tribological performance such as friction and wear resistance. Surface texturing can be performed either as a ...protruded or recessed asperity, with the latter being more popular due to advantages in terms of micro-lubrication and ease of manufacturing. There are a number of ways of material preparation for surface texturing, with the laser surface texturing being the most popular because of its flexibility and high accuracy. The performance of textured surface depends on the geometrical characteristics of the surface texture and the operating condition of the bearing components. In hydrodynamic and mixed lubrication, microcavity in negative surface texture acts as a reservoir for fluid lubricant, while in boundary lubrication, it traps wear particles to reduce further abrasion. In the past, tremendous amount of research effort has been put into the study of surface texturing, with an aim to investigate the underlying effect of surface texturing on tribological performance. This paper presents a critical review of research and development on surface texturing over the past decades, highlighting design, optimization and fabrication of surface texture, and their effects on tribological performance in terms of friction and load bearing capacity under different lubrication regimes. Numerical modelling approaches involving Reynolds and Navier–Stokes equations employed to understand and determine the tribological behaviour are discussed and compared with respect to experimental investigations. Thin film coatings on textured surface have been found to be a promising means to further reduce friction and increase wear life.
•Surface texturing to enhance tribological performance of slider bearings•Surface texture fabrication process, geometric optimization and modelling aspects•Thin film coating on textured surface as a promising means for further improvements•Potential use of surface texturing in lubricated and non-lubricated bearings•Requires more research effort to leverage the full benefits of surface texturing
•An efficient and good drilling performance of micro-textured drilling tools was proposed in this study.•A surface topography analysis experiment was used to predict the micro-textured drilling tools ...can solve drilling defects.•3D FEM simulation for drilling of Inconel 718 using micro-textured drilling tools is carried out and the results are experimentally validated.•Different micro-texture shapes (groove, convex and pit), were studied the effect of drilling performance.•A secondary cutting phenomenon that reduces the drilling performance is proposed, and increasing the width of the micro-texture can avoid it.
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In this study, finite element method (FEM) was used to study the performance of three different geometrically shaped micro-textures, namely grooved micro-texture, convex micro-texture and pit micro-texture drilling tool in the processing of Inconel 718 superalloy. By changing the key parameter of spindle speed, the purpose is to discuss the influence of changing drilling parameters on the machining performance of micro-textured drilling tools. Through the analysis and comparison of experiments, the results show that the micro-texture of the rake face can be well prepared by laser surface texturing technology, and the micro-textured drilling tools can alleviate the defects caused by conventional drilling tools. The simulation model is established and the changes of thrust force, drilling temperature and tool wear are compared and analyzed. In addition, the secondary cutting phenomenon of micro-texture during the drilling process was proposed for the first time, and the influence of micro-texture width on the secondary cutting phenomenon is analyzed. The results show that micro-texture implantation has lower thrust force, drilling temperature and tool wear, it is proved that micro-texturing technology can effectively improve the drilling process.
•Tool wear shows differences according to rake face texture and texture orientation.•Dimple texture leads to a stabilising effect with respect to built-up edge formation.•A destabilised BUE formation ...lead to higher wear rates of cutting tool in dry cutting.•Built-up edge formation can be tailored by configurations of surface microtextures.
During dry straight turning of plain carbon steel SAE 1045 with uncoated cemented carbide cutting tools in the cutting velocity regime 50m/min–150m/min wear is characterised by crater wear, flank wear and corner radius wear. In the low cutting velocity regime built-up edge (BUE) formation and built-up layers are visible. The BUE structures are instable in the cutting process and lead to a detoriation of the workpiece surface. Previous examinations revealed a local wear protecting effect of BUE with respect to the rake face, flank face and corner radius of the cutting tool (Kümmel et al., 2014). Laser surface texturing was applied to texture the rake face of the cutting tool with different textures (dimples and channels) to allow for changing the adhesion tendency of BUE on the cutting tool. By applying a dimple texture on the rake face the BUE could be best stabilised with respect to the untextured cemented carbide cutting tools. This is accompanied with a better wear behaviour compared to the untextured cutting tool with respect to corner radius wear. Contrary, channel textures destabilised BUE, while the wear of the cutting tool is increasing. The results clearly indicate that the adhesion of workpiece material on the rake face can be modified with respect to an untextured cemented carbide cutting tool in the dry metal cutting process by applying specific textures produced by laser texturing.
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