2 November 2000 Laser treatment of the 38HMJ steel surface in a liquid nitrogen environment
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Samples of the 38HMJ steel kept in a liquid nitrogen bath (LN2) at 77 K are treated by a 1 kW CO2 laser beam of intensity of about 1.3x105W/cm2 on the sample surface. For thermal processing by means of the 10,6 micrometers radiation the transparency window of LN2 below 0.3 eV is utilised. The irradiation effects are compared with results obtained for the reference samples of the same material under standard gas shielding conditions. Measurements of microhardness HV 0.1 indicated on reduction of the heat affected zone for the LN2 case. A similar effect is observed for higher sample velocities and a value of about 700 HV is obtained in a 30 micrometers surface layer. Surface analysis by means of Auger electron spectroscopy confirms the local nitrogen element of the laser treated areas depending on the processing conditions.
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Rafal Jendrzejewski, Gerard Sliwinski, Ilia Martev, Nikolay N. Nedialkov, Peter A. Atanasov, "Laser treatment of the 38HMJ steel surface in a liquid nitrogen environment", Proc. SPIE 4238, Laser Technology VI: Applications, (2 November 2000); doi: 10.1117/12.405970; https://doi.org/10.1117/12.405970


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