Abstract
Results are given for a study of the effect of laser hardening without melting on structure, microhardness, and surface quality of previously heat-treated steel 4Kh5MFS. The effect of laser hardening production regime parameters (laser radiation power and treatment rate) on structure, microhardness, dimensions of laser action zone and treated surface roughness is established. It is shown that laser thermal hardening of steel 4Kh5MFS makes it possible to obtain surface microhardness of the order of 675–750 HV and roughness of the order of 0.6–1.2 μm. Estimates are also obtained for the effect of low-temperature annealing at 300°C on the change in size and microhardness of a laser hardening zone.
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