0ptimization of geometrical features of laser cladding obtained by powder injection

A Nickel base alloy powder was deposited on stainless steel using a powder injection laser beam device. The influence of processing conditions on the geometrical aspects of laser claddings is studied. The morphology and metallurgical structure of the layer were investigated. Sections of such coatings were examined to reveal their morphology and microstructures using confocal microscopy and electron microscope (SEM). The results showed that different solidification morphologies, such as planar, cellular and dendrites formed, varying from the interface to the surface. Owing to the hard phases formed in the clad layer, the Vickers hardness is strongly enhanced and may reach 700 HV. The relation between processing parameters and cladding mechanical properties is discussed.