Abstract
Laser surface melt hardening of a pearlitic grey iron was carried out using a 1 kW continuous wave CO 2 laser, without preheating of the specimens and without prior graphite coating of the surface. It was shown that, with suitable laser processing conditions, it is possible to obtain melt areas without cracks in either single- or multiple-track melting experiments. In the case of single-track melting, the microstructure of the melted zone was composed of dendritic austenite and interdendritic ledeburite with a hardness of about 700 HV. For multiple-track melting, the austenite is partially transformed into cementite and martensite in overlapping regions, leading to an increase in the hardness.
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