Accumulation morphology on the surface of stainless steel irradiated by a nanosecond Nd:YAG pulsed laser |
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Authors: | YH Liu L Zhao AN Chumakov |
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Institution: | a The Key Lab of Automobile Materials, Ministry of Education, College of Materials Science and Engineering, Jilin University, Changchun 130025, PR China b B.I. Stepanov Institute of Physics of the National Academy of Sciences of Belarus, 68 Prospekt Nezavisimosti, Minsk 220072, Republic of Belarus |
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Abstract: | In this study, results in the irradiation of stainless steel AISI 304 in air with nanosecond laser pulses at laser irradiation power density 4×107 W/cm2 are reported. Laser processing parameters, such as wavelengths 532 and 1064 nm, pulse duration 20 ns and repetition rate 10 Hz were used. It is shown that the surface morphology of the stainless steel is related to the number of pulses applied to the same spot. The following surface morphological changes were observed: (i) occurrence of the micro-grains microstructures at wavelengths 532 and 1064 nm after 10 000 pulses irradiation and (ii) occurrence of vermiform-like microstructures at wavelength 1064 nm after 1000 pulses irradiation. Generally, it is concluded that irradiation due to several consecutive pulses caused significant damage and enhanced the stainless steel surface roughness. |
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Keywords: | Nanosecond pulsed laser Stainless steel Morphology |
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