Using the laser radiation at hard deposits on steels to improve

Laser are being used as a controlled intense source of heat for many metallurgical application. The main advantages of laser for materials processing are: very high accuracy in the final processed product than can be obtained without the need for polishing. The paper describes the process of obtaining hard layers resistant to wear, deposed by pulsed laser irradiation. The experimental tests were performed on samples made by two types of non-alloyed steels improvement (1.0503 and 1.0601) and two allied (1.6582 and 1.7035). They were initially subjected to heat treatment for improving, characteristic hardness and structure being obtained. The deposition of thin films it was made in a vacuum system (vacuum booster pump and a turbo molecular high vacuum pump) using a special gas device for working in nitrogen atmosphere. The purpose of this reseaches was to obtain a deposited layers made of hard and adherent silicon carbide; the substrate which is not affected while laser deposition remains tough, shock resistant. It is pointed out the influence of some factors of the working parameters (the target –substrate distance, the substrate temperature and the working pressure) on the deposition of thin films using lasers.