The article presents the study results of the microhardness and microstructures of gray cast iron СЧ20 after laser quenching and laser alloying with silicon carbide. The treatment was performed using a continuous CO2 laser with a power of 1 kW at a laser beam speed of 100-1100 mm/min. As a result of laser surface alloying of gray cast iron SiC, the microhardness increased from ...