Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
5360167 | Applied Surface Science | 2009 | 5 Pages |
Abstract
Interaction of Nd:YAG laser, operating at 1064 or 532Â nm wavelength and a pulse duration of 40Â ps, with AISI 1045 steel was studied. Surface damage thresholds were estimated to be 0.30 and 0.16Â J/cm2 at the wavelengths of 1064 and 532Â nm, respectively. The steel surface modification was studied at the laser energy density of 10.3Â J/cm2 (at 1064Â nm) and 5.4Â J/cm2 (at 532Â nm). The energy absorbed from Nd:YAG laser beam is partially converted to thermal energy, which generates a series of effects, such as melting, vaporization of the molten material, shock waves, etc. The following AISI 1045 steel surface morphological changes and processes were observed: (i) both laser wavelengths cause damage of the steel in the central zone of irradiated area; (ii) appearance of a hydrodynamic feature in the form of resolidified droplets of the material in the surrounding outer zone with 1064Â nm laser wavelength; (iii) appearance of periodic surface structures, at micro- and nano-level, with the 532Â nm wavelength and, (iv) development of plasma in front of the target. Generally, interaction of laser beam with the AISI 1045 steel (at 1064 and 532Â nm) results in a near-instantaneous creation of damage, meaning that large steel surfaces can be processed in short time.
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Authors
J. Stasic, M. Trtica, B. Gakovic, S. Petrovic, D. Batani, T. Desai, P. Panjan,