The effect of laser cladding modes on the geometrical parameters and adhesion strength of the deposited layer on a steel substrate 08Kh18N10T of corrosion-resistant powder 08Kh17N8S6G

Abstract The results of testing samples of steel 08Kh18N10T with deposited tracks and layers of corrosion-resistant powder 08Kh17N8S6G at various laser cladding modes for the development of coating technology for working surfaces of shut-off valves on nuclear and thermal power plants. Laser cladding the steel substrate was carried out on a robotic cladding complex with an ytterbium fiber laser and coaxial powder feed. Laser output, processing speed, mass flow rate and track overlap were variable parameters for evaluating the quality of laser cladding. Macrogeometry was performed on transverse sections, adhesion tests were carried out on special samples using a testing machine. The absence of pores, cracks, undercut by visual inspection and cross section samples, the adhesion strength of the layer to the substrate, penetration depth and clad height are used as quality of coating. Identified cladding parameters having an effect on increasing the clad height, the penetration depth, as a result, the adhesion strength are revealed. Laser cladding modes are selected that provide a deposited layer with a height of more than 1 mm and good adhesive properties.