Abstract
Four AISI 316L samples were laser surface alloyed with: 100wt% Ru powder, 100wt% Ni powder, and a mixture of Ni and Ru powders, 50wt% Ni-50wt% Ru and 80wt%Ni-20wt%. The laser power, beam diameter, and scan speed were fixed at 4kW, 4mm, and 0.8m/s, respectively. The microstructure and elemental composition of the deposited layers were analysed using optical and scanning electron microscopy (SEM) with energy dispersive spectroscopy (EDS) and in addition the electrochemical characteristics were determined. The laser alloyed layer was 1.8mm thick, hard, non-porous, and crack free layer that formed a dendritic, non-uniform elemental distribution, and an inhomogeneous microstructure. The microstructure of the layers depended on the composition of the powder used. The sample alloyed with 100wt% Ru powder showed mainly a columnar dendritic structure, while the sample alloyed with 100wt% Ni powder showed an equiaxed dendritic structure. The sample treated with 100wt% Ru had the most noble corrosion potential at −50mV and the lowest current density at 25µA/cm2 in 60wt% sulphuric acid solution at 45°C.
Sign-in/Register to access full text options 
Free) 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
