The paper focuses on a detailed analysis of chemical heterogeneity of Inconel 625 overlays with an increased molybdenum content deposited by laser cladding. Fifteen samples of laser overlays on S355J2 steel were prepared, each with an area of 90×140 mm. The thickness of the steel substrate was 50 mm. During the laser cladding process, the temperature field on the face of the substrate was monitored by means of a thermal imaging camera. The surfaces of the Inconel 625 overlays were then machined to their final thickness. Corrosion potential, polarization resistance and corrosion rate in selected areas of laser clads were determined by the potentiodynamic corrosion test. These data were correlated with the temperature profiles during laser cladding and with microstructures of the overlays.Keywords: Laser cladding, Inconel 625, heterogeneity, potentiodynamic corrosion test
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