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[en] Samples of 38HMJ steel kept in a liquid nitrogen bath (LN2) at 77 K are treated by a 1 kW CO2 laser beam. For thermal processing the transparency window of LN2 below 0.3 eV is utilised. The irradiation effects of the samples are analysed and compared with results obtained for the reference samples of the same material under standard gas shielding conditions. Measurements of microhardness indicate on reduction of the heat affected zone for the LN2 case. Surface analysis by means of Auger electron spectroscopy shows local nitrogen enrichment of the laser treated areas. (author)
Source
Komitet Elektroniki i Telekomunikacji PAN (Poland); Politechnika Szczecinska (Poland); Politechnika Warszawska (Poland); Wojskowa Akademia Techniczna (Poland); Polski Komitet Optoelektroniki, SEP (Poland); Polska Sekcja SPIE (Poland); 461 p; ISBN 83-87423-38-6; 
; 1999; p. 279-282; 6. Symposium of Laser Technique; 6. Sympozjum Techniki Laserowej; Szczecin-Swinoujscie (Poland); 27 Sep - 1 Oct 1999; Available at Institute of Electronic Materials Technology, Wolczynska 133, 01-919 Warsaw (PL); 2 refs, 4 figs
; 1999; p. 279-282; 6. Symposium of Laser Technique; 6. Sympozjum Techniki Laserowej; Szczecin-Swinoujscie (Poland); 27 Sep - 1 Oct 1999; Available at Institute of Electronic Materials Technology, Wolczynska 133, 01-919 Warsaw (PL); 2 refs, 4 figs