Abstract
ABSTRACT The interaction of a Transversely Excited Atmospheric (TEA CO2 laser, pulse duration less than 100 ns, with austeniticstainless steel- AISI 3 16 and low thickness coating of titanium-nitride (TiN) deposited on steel are considered. The resultshave shown that steel as well as coating had been modified by TEA CO2 laser beam. Compared to steel, TiN have shown morediverse changes in the bombarded area: crater like form, solidified boundary and droplets. On austenitic stainless steel- wallmaterial of the vacuum vessel for a fusion reactor - different mechanism of surface degradation was found. A qualitativedescription comprises: surface corrugation, cracking and resolidified.Keywords: Laser ablation; AISI 3 16 steel; Titanium nitride-coated steel; pulsed TEA carbon-dioxide laser. 1. INTRODUCTION The surface modification studies ofsteel as well as steel protected with coatings, by various types of energetic beams, includinga laser beam, are ofa great fundamental and technological interest. The studies of the laser beam interaction with various typesof steel in the last two decades are still persistent. The Nd:YAG, excimer and CO2 (continuous-wave regime) are frequentlyused laser beams for this purpos&3.The interaction ofa pulsed TEA CO2 laser beam with various types of steel including austenitic stainless and titanium nitride-coated steel is insufficiently known in the literature7. Among other applications, due to its good metallurgical, magnetic,
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