Student Femto- and nanosecond laser surface modification of stainless steelWednesday (24.06.2020) 12:08 - 12:11 Room 1
The rapid development of material processing technologies utilizing lasers, and their advantages, including in particular, high quality, resolution, and repeatability, imply the universality of application of these processes in terms of steel treatment and processing. Depending on selected laser radiation properties, a variety of phenomena occurs. In case of nanosecond pulse, usually an oxide layer is formed, so there is a change in both morphology and chemistry of the surface layer, whereas ultrashort pulses exert an impact mainly on the topography. Both lead to change in surfaces susceptibility to corrosion, optical properties, wettability, etc. In this research two different laser sources were used on AISI 304 stainless steel. First was nanosecond (pulse duration τ = 230 ns) ytterbium:glass fiber laser with a wavelength of 1062 nm. The second was femtosecond (τ = 280 fs) fiber laser with a wavelength of 1060 nm. The process parameters were selected in such a way that in the first case the surface of good anti corrosion properties was obtained, and in the second one, a homogenous LIPSS were produced. The stainless steel was irradiated with a varying combination of laser sources. Then, the microscopic visualisation, chemical analysis of XPS, corrosion tests (linear polarization resistance) (Figure 1a) and wettability was examined. The Tafel curves were recorded in 3% NaCl environment and the open circuit potential OCP was recorded for 1 h to achieve changes smaller than 1 mV/s.
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