Comparison on the Microstructure and Wear Behaviour of Flame Sprayed Ni-Based Alloy Coatings Remelted by Flame and Induction

This paper analyses the influence of remelting process on the microstructure characteristics and wear behavior of NiCrBSi alloy coatings. Two different remelting processes are investigated to obtain improvement in properties: flame spraying combined with flame remelting and flame spraying combined with induction remelting. A comparison of the microstructure and the tribological behavior is presented. A field-emission gun scanning electron microscope, energy dispersive X-ray microanalysis and X-ray diffraction analysis have been used to observe the microstructure characteristics of the coatings. The results reveal significant differences in the morphology, distribution, size and percentage of the phases of both coatings. The induction remelting technique results in higher Vickers hardness, excellent wear resistance and good remelting quality.