3 October 1997 Effect of a CO2 laser treatment of steel surface at cryogenic temperature
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For a CO2 laser irradiation of the steel samples kept at liquid nitrogen (LN2) temperature of 77 K the transparence window of LN2 below 0.3 eV is utilized. The irradiation effects are analyzed by means of microstructure observations and by the measurements of microhardness and are compared with results obtained for the reference samples of the same material under standard gas shielding conditions. A marked reduction of the heat affected zone for the LN2 case in comparison with that obtained for the reference samples is observed. Microphotographs indicate on a decrease of the grain size dimensions in the remelted and heat affected zones, and especially in the intermediate layers between them. The finer structure of increased homogeneity results in an extension of the surface layer of higher microhardness.
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R. Zaremba, R. Zaremba, Gerard Sliwinski, Gerard Sliwinski, Rafal Jendrzejewski, Rafal Jendrzejewski, W. Serbinski, W. Serbinski, } "Effect of a CO2 laser treatment of steel surface at cryogenic temperature", Proc. SPIE 3187, Laser Technology V: Applications in Materials Sciences and Engineering, (3 October 1997); doi: 10.1117/12.287836; https://doi.org/10.1117/12.287836

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