Abstract
Surface heat treatment of steel by using laser technology is the most developed method of hardening for machine elements and tools, where it formes on the surface structure with optimal properties. The structure depends on phase's transformation which occures in steel after laser treatment. The mechanism of mutual reaction between laser beam and steel is bind by kind of laser generation, wave length, power and scanning speed. The scanning speed of CW laser beam became the most important parameters of laser surface treatment. This paper concentrate on the study of the effect of laser scanning speed for steel surface on the depth of heating zone in three kind of carbon steel and the microhardness inside heat effected zone. It has been shown that both of microhardness and depth of hardening layer are decreased when scanning speed is increased. Also, it has been studied the relation between microhardness and the containment of carbon in steel.
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