Laser Surface Modification Research Articles

The Use of Laser Surface Modification Technologies for Obtaining Parts of Roller-Screw Mechanism

A number of parts of roller-screw mechanisms (RSM), which work in aggressive environments, are made of corrosion-resistant stainless steel 40Cr13 (AISI420 analogue). These elements include a screw and rollers. For these parts, it is necessary to have hard surface layers and a soft core. A promising method for obtaining the necessary requirements is surface laser modification. The article investigated the effect of laser surface treatment on the value of the coefficient of elasticity, hardness, coefficient of friction and the amount of wear of products made of stainless alloy steel 40Cr13. For laser processing, the SVAROG-1-5DR laser complex (Russia) was used. Various modes of surface laser modification were set. For this purpose, the power of the laser power, the speed of movement of the laser beam relative to the treated surface, and the focal length were varied. The Vickers hardness and tribological characteristics were measured using a microcombitester and tribometer manufactured by SSM Instruments SA (Switzerland). The Rockwell hardness was measured using a TN 301 hardness tester manufactured by Time Group (China). The structure of the alloy was studied by metallography and X-ray diffractometry. It was found that the indicators of hardness and wear resistance of the surface layers of sctructural 40Cr13 steel strongly depend on the laser treatment modes. These dependencies are extreme, with highs and lows. The paper presents the quantitative values of the hardness and wear resistance indicators before and after laser treatment of the surface of this steel in various modes. The reasons for the change in the hardness and wear of the surface layers of 40Cr13 steel after laser treatment under different modes are established. The results of the work were used to optimize the modes of laser treatment of the surface of 40Cr13 steel in order to obtain the maximum values of hardness and wear resistance.

Quantitative Evaluation of the Effectiveness of Laser Surface Modification Technologies

Two new parameters – reduced wear and reduced integral microhardness of the modified surface layer was used to evaluate the effectiveness of surface hardening technologies. The existence of a correlation between the entered parameters is shown, the regression equation is obtained based on the analysis of experimental data of the wear of a tool made of steel CrWMn and U10 treated with a laser with coatings in the reflow mode. We construct the functional dependence of tool wear on this parameter.

Numerical Analysis of Microstructure Anomalies during Laser Welding Nickel-Based Single-Crystal Superalloy Part I: Salient Aluminum Redistribution Melioration

Correlation between welding conditions, such as laser power, welding speed and welding configuration, microstructure anomalies, including columnar/equiaxed transition (CET) and stray grain formation, and metallurgical factors, such as aluminum redistribution and supersaturation near dendrite tip, is elucidated by thorough numerical analysis to explain prevalent phenomenon of insidious microstructure development and face the challenge of microstructure amelioration as well as solidification cracking resistance improvement during course of ternary single-crystal Nickel-Chromium-Aluminum superalloy melt-pool solidification for crack-free laser surface modification. Metallurgical factors of γ gamma phase microstructure development strongly depend on welding configuration, and heat input is not as important as welding configuration. Although melted-pool center region is susceptible to microstructure anomalies, (001)/[100] welding configuration possesses auspicious growth crystallography under which the bimodal profiles of solid aluminum concentration and liquid aluminum supersaturation ahead of dendrite tip are symmetrically distributed to potentially decrease solute redistribution and increase resistibility to solidification cracking. Dissimilarly, (001)/[110] welding configuration possesses insidious growth crystallography under which the profiles of solid aluminum concentration and liquid aluminum supersaturation ahead of dendrite tip are asymmetrically distributed to preferably facilitate alloying plentiful enrichment and differentiate problematical microstructure instability on half side of molten pool. In the bottom of molten pool, beneficial Al-barren [001] dendrite is kinetically driven by homologous single-crystal epitaxial growth without columnar/equiaxed transition. On the right side of molten pool, detrimental Al-rich [100] dendrite is spontaneously susceptible to stray grain formation with equiaxed morphology. Symmetrical microstructure development is more enrichment-resistant than asymmetrical microstructure development, which is crystallographically ascribable to favorable thermo-metallurgical factors, i.e. aluminum redistribution mitigation and supersaturation relief, and substantially reduce metallurgical degradation and microstructure failure. The faster welding speed and the lower laser power are used, the smaller aluminum concentration and supersaturation ahead of dendrite tip are kinetically incurred to suppress columnar/equiaxed transition and stray grain formation with a number of thermometallurgical factors contribution to considerable microstructure amelioration and increasingly improve solidification cracking resistance and vice versa. Shallow molten-pool shape with symmetrical growth crystallography efficiently advances anomalies-resistant microstructure development with diminution of partition driving forces for solute redistribution and supersaturation during nonequilibrium solidification instead of deep molten-pool shape with asymmetrical growth crystallography. The latter importantly aggravates stray grain formation. Useful combination of optimum solidification conditions and favorable growth crystallography predominantly minimizes diffusion-controlled solute deviation and microstructure anomalies for excellent single-crystal superalloy laser processing without cracking, and possesses tenable relationship between welding conditions, solute redistribution and microstructure anomalies. The mechanism of crystallography-aided concentration fluctuation and copious supersaturation behind prominent phenomenon of microstructure anomalies, where nucleation and growth of stray grain formation near dendrite tip are activated, is consequently proposed. The comparison between numerical analyses and experiment results are valid and satisfactory. Microstructure anomalies are predictable for proper understanding of multicomponent microstructure development in the interior of fusion zone. The theoretical methodology is reproducible as consequence of availability of thermodynamic and kinetic properties of Nickel-based or Iron-based single-crystal superalloys.

Fabrication, transport behaviors and green interrupted cutting performance of bio-inspired microstructure on Al2O3/TiC composite ceramic surface

Fabrication, transport behaviors and green interrupted cutting performance were studied for the bio-inspired microstructure on Al2O3/TiC composite (micro-composite and micro-nano-composite) ceramic surface. Manis pentadactyla's scale provided inspiration for the establishment of the bio-inspired microstructure. The bio-inspired microstructure was divided into the lipophilic zone (ZL) and the oleophobic zone (ZO). Zone ZO with square protruding microtexture was designed to be unchanged, while six different kinds of microtextures were proposed for zone ZL. Then, six kinds of bio-inspired microstructures were prepared by nanosecond laser processing and surface modification to realize spontaneous transportation of the base oil of vegetable-oil-based nanofluid (VN). Moreover, investigations were conducted to evaluate the performance of the bio-inspired microstructure in VN minimum quantity lubrication (VNMQL) interrupted cutting. It was found that higher transport speed resulted in more adequate lubrication and lower cutting load, leading to better performance of the bio-inspired microstructure. The combination of longitudinal sawteeth microtexture in zone ZL and micro-nano-composite ceramic can be employed to acquire both the highest transport speed and the optimum cutting performance. The proposed bio-inspired microstructure efficiently enhanced the performance of Al2O3/TiC composite ceramic tool in VNMQL interrupted cutting.

Effects of laser surface modification on the adhesion strength and fracture mechanism of electroless-plated coatings

The adhesion strength between the circuit and substrate is a key factor that affects the performance of electronics. Laser modification assisted metallization technology (LAM), which can fabricate high-adhesion metallic pattern on ceramic without masks, is generally considered as a promising selective metallizing method. However, it seems lack of the reports about how the texturing patterns affect the coating adhesion on ceramic up to now. In this paper, three kinds of texturing patterns—parallel groove texture (PGT), parallel wave texture (PWT) and square net texture (SNT) with different laser scanning spacings (D) were fabricated on ceramic substrates by laser modification, and the copper was selectively electroless-plated on the textured surface. Then, the influences of textures on the adhesion strength and fracture mechanism of copper-ceramic were studied systematically. Results indicated that the adhesion were significantly affected by the surface area, microstructures and structural defects of the textures. Compared with PGTs and PWTs, SNTs showed a more significant effect on improving the adhesion, in which a reliable obtuse-angled anchoring bond was generated at D = 60 μm (sample SN60), making the fracture take place at the copper, ceramic and copper-ceramic interface simultaneously, and the maximum adhesion strength as high as 43.2 MPa was obtained.

Surface modification of titanium alloy via atmospheric pressure nitrogen plasma assisted femtosecond laser irradiation

The effect of atmospheric pressure nitrogen plasma in conjunction with femtosecond laser surface modification of Ti–6Al–4V samples was investigated. It was suggested that the superior friction and wear characteristics of the LP series (the sample subjected to both laser and plasma irradiation) were induced by the synergistic combination of the following three factors: the increased smoothness induced by homogenizing the laser-induced periodic surface groove shape structure, the high hardness caused by grain refinement and the high toughness and low friction properties conferred to the sample by the formation of oxynitride.

Enhanced Hydrofobicity of Polymers for Personal Protective Equipment Achieved by Chemical and Physical Modification.

The article presents significant results in research on creating superhydrophobic properties of materials which can be used as an interesting material for use in self-cleaning polymer protective gloves and similar applications where the superhydrophobicity plays a significant role. In this work the influence of laser surface modification of MVQ silicone rubber was investigated. The research was conducted using a nanosecond-pulsed laser at 1060 nm wavelength. After a process of laser ablation, the surface condition was examined using a SEM microscope and infrared spectroscopy. During the tests, the contact angle was checked both before and after the laser modification of samples pre-geometrised in the process of their production. The test results presented in the paper indicate that the chemical and physical modifications contribute to the change in the MVQ silicone rubber contact angle. A significant increase (by more than 30°) in the contact angle to 138° was observed. It was confirmed that surface geometrisation is not the only factor contributing to an increase in the contact angle of the analyzed material; other factors include a change in laser texturing parameters, such as mean beam power, pulse duration, scanning speed and pulse repetition frequency.

Investigation of the effect of laser surface modification on the hardness and wear resistance of a titanium alloy

The effect of laser modification of the surface on the value of the coefficient of elasticity, hardness, coefficient of friction and the amount of wear of the counter body when testing products made of a deformable titanium alloy was investigated. It was found that the indicators of hardness and wear resistance of a titanium alloy depend on the modes of laser modification. These dependencies are extreme in nature, they have maxima and minima. The quantitative values of hardness and wear resistance indicators for the specified material before and after laser treatment of its surface in various modes are given.

Experimental study of CFRP laser surface modification and bonding characteristics of CFRP/Al6061 heterogeneous joints

With the increasing demand of modern aerospace lightweight, the reliable connection between CFRP and aluminum alloy becomes a difficulty. In this paper, the effect of laser modification on the bonding strength of CFRP surface was studied. Different patterns of laser treatment were used to improve the bonding strength of CFRP surface. SEM and EDS were used to characterize the surface morphology and element types and contents of CFRP after laser treatment. It was found that the bond strength was directly affected by the exposed continuity of carbon fiber and the residual resin. The bond strength of annular pattern with large diameter and large spacing was the highest, and the main failure mode was cohesive failure. With the increase of scanning times, the bond strength increased first and then decreased, and the capillary effect of the carbon fiber and the air pressure in the micro groove play a leading role. In a word, the laser patterning pretreatment on the surface of CFRP is beneficial to improve the bonding strength of heterogeneous joints, and the maximum bonding strength can reach 28.58mpa.

UV laser-produced copper micro-mesh with superhydrophobic-oleophilic surface for oil-water separation

We report a method to fabricate micro-pore arrays on a copper sheet by a 355 nm UV nanosecond pulse laser, and investigate the effects of surface microstructures and micro-pore spacing on the wettability of the formed copper micro-mesh. We found that the surface was initially hydrophilic, but changed to superhydrophobic-oleophilic with water contact angle 151° and oil contact angle about 10° after exposed to ambient environment for 14 days. We analysed the surface morphologies of the processed samples with a three-dimensional profilometer, measured the water and oil contact angles, and characterized the surface by a field emission environmental scanning electron microscope (FESEM) and energy dispersive X-ray spectrometer (EDS). The surface chemistry changes were confirmed by X-ray photographic spectroscopy (XPS). Effective oil-water separation performance of the fabricated copper mesh was demonstrated. Learning from the natural change, we designed a coating material containing C8 long C–C (H) chain and coated onto the freshly prepared copper mesh to convert the surface property into a preferred superhydrophobic-oleophilic nature. This study provides a controllable methodology consisting laser processing and surface modification for making micro-pore copper mesh as a simple and effective method for oil-water separation.

Antibacterial properties and cytocompatibility of Ti-20Zr-10Nb-4Ta alloy surface with Ag microparticles by laser treatment

In order to improve the antibacterial behavior of Ti-20Zr-10Nb-4Ta (TZNT) alloy, Ag, with broad-spectrum antibacterial properties, was introduced on the surface of TZNT using a simple and efficient laser surface modification method. After laser treatment of TZNT alloy covered by Ag foil, Ag microparticles were successfully formed on the surface. The SEM, EDS, 3D topography and XRD were investigated to prove the presence of Ag microparticles. The characteristic peaks of cubic silver crystal were observed in XRD results. The Ag2O film on the surface of Ag microparticles was confirmed by XPS. The contact angel tests show that laser60 and laser70 TZNT alloys possess better hydrophilic character and higher free surface energy, compared with untreated TZNT. All laser-treated TZNT alloys reveal a higher OCP, Ecorr and Rct than untreated TZNT. However, a larger corrosion rate and a lower Rf are concluded for laser-treated TZNT alloys due to the influence of Ag microparticles. The results of in vitro antibacterial and cytocompatibility experiments indicate that Ag microparticles exhibit high antibacterial property (with a 96.3% minimum antibacterial rate) against both E. coli and S. aureus and good cytocompatibility with MC3T3-E1. This research presents a simple and efficient laser surface modification method for improving antibacterial resistance of titanium implant surface, which has a good application prospect in orthopaedic field.

Laser Surface Modification of Powder Metallurgy-Processed Ti-Graphite Composite Which Can Enhance Cells' Osteo-Differentiation.

The paper examines the surface functionalization of a new type of Ti-graphite composite, a dental biomaterial prepared by vacuum low-temperature extrusion of hydrogenated-dehydrogenated titanium powder mixed with graphite flakes. Two experimental surfaces were prepared by laser micromachining applying different levels of incident energy of the fiber nanosecond laser working at 1064 nm wavelength. The surface integrity of the machined surfaces was evaluated, including surface roughness parameters measurement by contact profilometry and confocal laser scanning microscopy. The chemical and phase composition were comprehensively evaluated by scanning electron microscopy, energy-dispersive X-ray spectroscopy and X-ray diffraction analyses. Finally, the in vitro tests using human mesenchymal stem cells were conducted to compare the influence of the laser processing parameters used on the cell’s cultivation and osteo-differentiation. The bioactivity results confirmed that the surface profile with positive kurtosis, platykurtic distribution curve and higher value of peaks spacing exhibited better bioactivity compared to the surface profile with negative kurtosis coefficient, leptokurtic distribution curve and lower peaks spacing.

Enhancement of laser heating process by laser surface modification on Titanium alloy

Titanium alloys are widely utilized in laser heating applications. However, it has poor optical properties due to low laser energy absorption. Nevertheless, a higher energy absorption can be realized by modifying the surface profile through increasing the surface roughness. In this present work, the laser surface modification (LSM) process was carried out to increase the roughness on surface of Ti6Al4V titanium alloy. Subsequently, the surface characterization and surface roughness were analysed by using the 3D optical microscope. The effect of laser power on the increment of surface roughness was investigated. It was revealed that an increase in laser power during LSM process could increase the surface roughness. The result shows that, the surface roughness of titanium alloy increased 27 times when modified with the highest laser power (27W) compared to the gritted surface. Furthermore, the modified surface by LSM will be heated using laser radiation in order to analyse the effect of surface roughness towards laser heating temperature. Depending on the value of the power during laser heating, the maximum temperature measured could be increased 27% corresponding to a gritted flat reference surface.

Enhancement of the wettability of graphite-based lithium-ion battery anodes by selective laser surface modification using low energy nanosecond pulses

The electrolyte filling process of battery cells is one of the time-critical bottlenecks in cell production. Wetting is of particular importance here, since only completely wetted electrode sections are working. In order to accelerate and facilitate this process, the authors of this study developed a method to significantly increase the wettability of graphite-based anodes by a laser surface modification using low energy nanosecond laser pulses. The anode surface microstructure was evaluated by means of white-light interferometry and scanning electron microscopy. The assessment of wettability was done by drop test and capillary rise test of the liquid electrolyte. The results show that there is a predominantly selective ablation process for laser energy inputs below 2 J/m by which the graphite active material remains unaffected and the binder material is decomposed. The observed increase in surface roughness correlates with the increasing wettability. Investigations using Raman spectroscopy showed that laser treatment leads to a damage on the crystalline structure of the graphite particle surface. However, treating an entire anode including 6 wt% binder and conductive carbon black has shown that the overall amorphous content of the anodes surface can be reduced by 32% through treating the surface with a laser energy of 1.29 J/m. Up to that point, which is the resulting parameter range for the selective process, it is possible to ablate the amorphous binder and carbon black phase coevally exposing graphite particles while keeping their crystalline structure. Exceeding that range, ablation of the whole anode composite dominates and amorphization of the graphite surface occurs. The electrode’s capacity was tested on half-cells in coin cell format. For the whole laser parameter range investigated, the anodes capacity matches the mass loss caused by laser ablation. No additional capacity loss was observed due to amorphization of the exterior graphite particle’s surface.

Numerical and experimental investigation of complex surface topography evolution during laser surface modification with raster scan

This work investigates the complex surface topography evolution of an area during laser surface modification with raster scan. A nonlinear three dimensional transient numerical model is developed to capture the melt pool dynamics, solidification and resulting surface evolution, during laser surface modification with raster scanning. Further laser surface modification of Ti6Al4V is performed with different combinations of scanning speed and beam overlap. Surface profiles from laser modified samples are captured using optical profilometer. In order to study the surface features quantitatively and compare against the numerical predictions, three surface parameters are defined: crest-trough area ratio, trough spacing along overlap direction and mean feature aspect ratio. A modified non-dimensional heat input for raster scan is also introduced, to which Marangoni number is more sensitive, as compared against the traditional non-dimensional heat input for laser based processes. Surface parameters from numerical predictions compare well against the experimental results. Irrespective of beam overlap, slower scanning speeds led to lower crest-trough area ratio and mean feature aspect ratio. This is attributed to wider melt pool (lower melt pool aspect ratio), owing to higher heat input at lower scanning speeds, which promotes the surface tension driven forces and melt pool circulation. Numerical results indicated improved fluid circulation at higher beam overlaps as well. However, crest-trough area ratio increased at higher beam overlaps, as surface features from previous passes undergo re-melting. Numerical results reveal that higher beam overlaps lead to downward movement of molten metal towards the re-melted region, which leads to asymmetric melt pool and filling of trough regions (from previous passes). This reduces trough area upon solidification (higher crest-trough area ratio) and lowers average surface feature height as beam overlap increases.

High-temperature abrasive wear characteristics of H13 steel modified by laser remelting and cladded with Stellite 6 and Stellite 6/30% WC

The study is aimed to analyse the comparative behaviour of the high-temperature abrasive wear of H13 steel surfaces modified by laser melting and cladding with Stellite 6 and Stellite 6 + 30 wt% WC. 3-body abrasive tests were conducted at room temperature, 450 °C, 550 °C, and 650 °C. The microstructural evolution, microhardness, wear surface morphology and mechanisms, and various phases formed during laser surface modifications were also studied. The laser remelting of H13 steel surface increased its room temperature microhardness to 750 ± 35 HV0.01, whereas laser cladding of Stellite 6 powder yielded hardness of around 600 ± 20 HV0.01 in the clad layer; and Stellite 6/WC composite clad layer had marginally higher hardness than the Stellite 6 clad layer in the matrix and much higher hardness of ~3000 HV0.01 at the sporadically distributed WC particle sites. Though the room temperature microhardness of laser remelted H13 surface is the highest, the volumetric wear loss in it was comparable to that of the Stellite 6 cladding. However, Stellite 6/WC composite layer recorded a relatively less volumetric loss as WC particles resisted the abrasive wear. With increasing temperature, the wear loss in laser remelt surfaces increased at a fast rate, while that in Stellite 6 and composite clad layers varied marginally with no definite trend. Overall, Stellite 6/WC composite cladding performed better than others in the current temperature range.

Modeling of laser surface modification processes of tool steel to predict the temperature distribution and modification zone

Process of metal surface modification during laser treatment requires a long search and control of the treatment technological parameters, depending on the technical requirements imposed on it. The article proposes a method of mathematical modeling of heat transfer during laser processing of the high carbon steel 9HS (equivalent to DIN 150Cr14). The dimensions of the hardening area are calculated with high accuracy by the isotherm of the critical temperature Ac3. The influence of the main technological parameters (radiation power, laser spot diameter, processing speed) on the depth and width of the hardening zone is shown. The paper also presents the use of the build model for the selection of multitrack processing modes to harden high-carbon steel 9HS to the required depth without surface melting.

Effect of alloying elements on laser surface modification of powder metallurgy to improve surface mechanical properties of beta titanium alloys for biomedical application

Beta-type titanium alloy surfaces (Ti–35Nb–10Ta (TNT) and Ti–30Nb–4Sn (TNS)) were modified by laser using a power of 1000 W and speed of 6.7 mm/s (Condition A) and a power of 1500 W with speed of 10 mm/s (Condition B). Increasing laser conditions, the thickness of the molten layer was also increased. The initial equiaxed grains changes to quite elongated grains shape. The surfaces were structured under α″ martensite, α and matrix β. The β phase content decreased slightly and the α″ phase increased for both alloys increasing the laser conditions. The condition A increased the elastic modulus (E) and decreased the hardness while condition B did not affect the mechanical properties surface for the TNT system compared to base metal (BM). In TNS system the laser condition A decreased the E and increased the hardness while increasing the laser parameters (Condition B) both E and hardness decreased compared to BM. The laser surface treatment was influenced by the levels of alloying elements present promoting most significant changes in the microstructure and mechanical properties in the TNS system.

Femtosecond laser surface modification of magnesium aluminate spinel and its effect on polishing

Magnesium aluminate spinel is a promising material for optical windows due to its outstanding comprehensive properties. However, the highly efficient polishing of spinel by traditional processing is difficult due to its high hardness, high strength and chemical inertness. In this study, a femtosecond laser was used to induce micro-nanostructures on the spinel surface to improve its machinability. The effects of laser power, scanning speed and scanning interval on the surface morphology of the spinel were studied. The experimental results indicate that the femtosecond laser modification reduced the surface hardness of the spinel, and the critical cutting depth was increased. Moreover, the micro-nanostructures resulting from the laser modification improved the contact area between the slurry and the substrate, which improved the polishing performance. Experiments were carried out to prove that the chemical mechanical polishing (CMP) process of spinel can be promoted by femtosecond laser surface modification. This method provides a new perspective for high-performance spinel ultra-precision manufacturing. • A highly efficient femtosecond laser surface modification assisted polishing for spinel is proposed, the improved mechanisms were analyzed. • The effect of laser modification parameters on the evolution of micro-nanostructures on the spinel was investigated. • This method has obvious advantages such as simplicity, flexibility, thus making it a very promising machining method.

Biomimetic Hierarchical Structuring of PLA by Ultra-Short Laser Pulses for Processing of Tissue Engineered Matrices: Study of Cellular and Antibacterial Behavior.

The influence of ultra-short laser modification on the surface morphology and possible chemical alteration of poly-lactic acid (PLA) matrix in respect to the optimization of cellular and antibacterial behavior were investigated in this study. Scanning electron microscopy (SEM) morphological examination of the processed PLA surface showed the formation of diverse hierarchical surface microstructures, generated by irradiation with a range of laser fluences (F) and scanning velocities (V) values. By controlling the laser parameters, diverse surface roughness can be achieved, thus influencing cellular dynamics. This surface feedback can be applied to finely tune and control diverse biomaterial surface properties like wettability, reflectivity, and biomimetics. The triggering of thermal effects, leading to the ejection of material with subsequent solidification and formation of raised rims and 3D-like hollow structures along the processed zones, demonstrated a direct correlation to the wettability of the PLA. A transition from superhydrophobic (θ > 150°) to super hydrophilic (θ < 20°) surfaces can be achieved by the creation of grooves with V = 0.6 mm/s, F = 1.7 J/cm2. The achieved hierarchical architecture affected morphology and thickness of the processed samples which were linked to the nature of ultra-short laser-material interaction effects, namely the precipitation of temperature distribution during material processing can be strongly minimized with ultrashort pulses leading to non-thermal and spatially localized effects that can facilitate volume ablation without collateral thermal damage The obtained modification zones were analyzed employing Fourier transform infrared (FTIR), X-ray photoelectron spectroscopy (XPS), Energy dispersive X-ray analysis (EDX), and optical profilometer. The modification of the PLA surface resulted in an increased roughness value for treatment with lower velocities (V = 0.6 mm/s). Thus, the substrate gains a 3D-like architecture and forms a natural matrix by microprocessing with V = 0.6 mm/s, F = 1.7 J/cm2, and V = 3.8 mm/s, F = 0.8 J/cm2. The tests performed with Mesenchymal stem cells (MSCs) demonstrated that the ultra-short laser surface modification altered the cell orientation and promoted cell growth. The topographical design was tested also for the effectiveness of bacterial attachment concerning chosen parameters for the creation of an array with defined geometrical patterns.