Porous microstructures induced by picosecond laser scanning irradiation on stainless steel surface |
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| Institution: | 1. CIC microGUNE, Goiru Kalea 9 Polo Innovación Garaia, 20500 Arrasate-Mondragón, Spain;2. CEIT-IK4 & Tecnun (University of Navarra), Paseo Manuel Lardizábal 15, 20018 San Sebastián, Spain;1. Department of Materials Engineering, Sichuan Engineering Technical College, Deyang 618000, China;2. Laser Fusion Research Center, China Academy of Engineering Physics, Mianyang 621900, China;3. School of Physics, University of Electronic Science and Technology of China, Chengdu 610054, China;1. School of Mechanical Engineering, Xi’an Jiaotong University, Xi’an 710049, China;2. State Key Laboratory for Manufacturing Systems Engineering, Xi’an Jiaotong University, Xi’an 710054, China;3. Shaanxi Key Laboratory of Intelligent Robots, Xi’an 710049, China;1. Fraunhofer-Institut für Werkstoff- und Strahltechnik (IWS), Winterbergstr. 28, 01277 Dresden, Germany;2. Helmholtz-Zentrum Dresden-Rossendorf (HZDR), Bautzner Landstr. 400, 01328 Dresden, Germany;3. Technische Universität Dresden, Institut für Fertigungstechnik, 01062 Dresden, Germany |
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| Abstract: | A study of porous surfaces having micropores significantly smaller than laser spot on the stainless steel 304L sample surface induced by a picosecond regenerative amplified laser, operating at 1064 nm, is presented. Variations in the interaction regime of picosecond laser pulses with stainless steel surfaces at peak irradiation fluences(Fpk=0.378–4.496 J/cm2) with scanning speeds(v=125–1000 μm/s) and scan line spacings(s=0–50 μm) have been observed and thoroughly investigated. It is observed that interactions within these parameters allows for the generation of well-defined structured surfaces. To investigate the formation mechanism of sub-focus micropores, the influence of key processing parameters has been analyzed using a pre-designed laser pulse scanning layout. Appearances of sub-focus ripples and micropores with the variation of laser peak fluence, scanning speed and scan line spacing have been observed. The dependencies of surface structures on these interaction parameters have been preliminarily verified. With the help of the experimental results obtained, interaction parameters for fabrication of large area homogeneous porous structures with the feature sizes in the range of 3–15 μm are determined. |
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| Keywords: | Porous surface Micropores Laser surface texturing Picosecond laser |
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