@conference{
author = "Chumakov, A. N. and Nikonchuk, I. S. and Gaković, Biljana M. and Petrović, Suzana and Mitrić, Miodrag and Lupulescu, C.",
year = "2015",
abstract = "Creation of various surface structures on the laser-irradiated materials and formation of metal oxides play an important role to improve the mechanical, physical and chemical properties of materials used in different fields of industry [1-4]. Therefore, the establishment of main mechanisms and optimal regimes of laser micro and nanostructuring of materials and regularities of oxides formation is an important task. In the present study the multipulse laser irradiation (λ = 1064 nm, τ = 1 ns, f = 100÷500 Hz, q = 4.4·109 W/cm2) was used to create micro and nanostructures on the surface of high quality structural carbon steel at different conditions. Steel samples were moving along a computer given trajectory with a velocity of v = 0.2 cm/s. Steel samples were irradiated in ambient air, 3% hydrogen peroxide (H2O2) and ethanol (C2H5OH). Surface structures and composition analysis were examined by methods of optical and scanning electron microscopy. X-ray diffraction (XRD) was used to analyze a phase composition of irradiated steel samples. XRD spectra for various conditions of laser action have had different intensity profiles (peaks value, its position and width). Energydispersive X-ray spectroscopy (EDS) was used for elemental analyses. Surface structures were examined by scanning electron microscope (SEM). The detected surface structures are strongly depends on environment conditions and parameters of laser irradiation. In particular, on the surface of steel samples irradiated in the ambient air, wave structures with a period of 1 μm, irregular structures with a size of ÷22000 nm, grains with the size of 50÷200 nm, pores and irregular threadlike structures were observed. Quasiregular structures with a size of 100÷200 nm and plurality of pores with a size of 40÷600 nm were discovered on the surface of steel samples irradiated in the ethanol. On the surface of the samples irradiated in the environment of hydrogen peroxide numerous cracks and grain structures with the size of 30÷70 nm were observed. The reasons of these differences are discussed.",
publisher = "Belgrade : Vinča Institute of Nuclear Sciences",
journal = "PHOTONICA2015 : 5th International School and Conference on Photonics and COST actions: MP1204, BM1205 and MP1205 : book of abstracts; August 24-28, 2015; Belgrade",
title = "Microstructures and oxides formation on structural steel by nanosecond laser irradiation",
pages = "188-189",
url = "https://hdl.handle.net/21.15107/rcub_vinar_10957"
}
