Laser treatment of the 38HMJ steel surface in a liquid nitrogen environment

Rafal Jendrzejewski; Gerard Sliwinski; Ilia Martev; Nikolay N. Nedialkov; Peter A. Atanasov

doi:10.1117/12.405970

2 November 2000 Laser treatment of the 38HMJ steel surface in a liquid nitrogen environment

Rafal Jendrzejewski, Gerard Sliwinski, Ilia Martev, Nikolay N. Nedialkov, Peter A. Atanasov

Proceedings Volume 4238, Laser Technology VI: Applications; (2000) https://doi.org/10.1117/12.405970
Event: Laser Technology VI, 1999, Szczecin, Poland

Abstract

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.

Citation Download Citation

Rafal Jendrzejewski, Gerard Sliwinski, Ilia Martev, Nikolay N. Nedialkov, and 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); https://doi.org/10.1117/12.405970

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