Abstract
The article presents the results of the study of the effect of laser treatment on the structure and microhardness of the surface of high-carbon steel samples. The treatment is carried out in order to obtain surface layers, parts with high properties for industries of various purposes. The samples from high-carbon steel U10 A after preliminary thermal treatment by modes of 780–800 °C heating for 2 minutes with cooling in 10 percent water solution of sodium chloride with tempering at 270–320 °C and cooled in the air and without the thermal treatment are treated with the Nd:YAG laser with the capacity up to 1 kW. Metallographic studies and microhardness properties illustrate the influence of laser surface processing on the increase in mechanical properties. It is shown that the laser thermal treatment of steel allows obtaining a surface microhardness of about HV 800-1000 MPa and depends on the original state of the metal and the previous thermal treatment.
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