Modifications of AISI 1045 steel by picosecond Nd:YAG laser at 266 nm; comparison with 532 and 1064 nm pulses
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Interaction of Nd:YAG laser, operating at 266 nm wavelength and a pulse duration of 40 ps, with AISI 1045 steel was studied. Surface damage threshold was estimated to be 0.14 J/cm(2). The steel surface modi. cation was studied at the laser fluence of similar to 1.0 J/cm(2). 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) intensive damage of the target in the central zone of irradiated area; (ii) appearance of periodic surface structures at nano-level, with periodicity in agreement with the used wavelength; (iii) reduction of oxygen concentration in irradiated area; and (iv) development of plasma in front of the target. Generally, interaction of laser beam with AISI 1045 steel (at 266 nm) results in a near-instantaneous creation of damage, meaning tha...t large steel surfaces can be modified in short times. (C) 2009 Elsevier B. V. All rights reserved.
Кључне речи:AISI 1045 steel / Laser-matter interaction / Picosecond Nd:YAG laser / 266 nm wavelength
Извор:Applied Surface Science, 2009, 255, 19, 8221-8225
- Ministry of Science and Technological Development of the Republic of Serbia 
ISSN: 0169-4332 (print)