NiCrBSi/WC Composite Claddings Processed on AISI 316L Steel Alloy by the Direct Laser Deposition Process: Studies on Dry Sliding Wear Behavior and Wear Mechanism Maps

This study presented the wear behavior of the NiCrBSi/WC composite claddings processed on an AISI 316L steel alloy substrate by laser cladding approach. The scanning electron microscope (SEM) morphology of the claddings has shown excellent substrate-cladding interface bonding, good WC particulate distribution, and no noticeable cracks and voids. The electron dispersion spectroscope (EDS) spectra have confirmed the presence of respective NiCrBSi alloy matrix and WC elements. The XRD spectra have identified various phases and compounds such as gamma-Ni, FeNi3, Ni3B, Cr23C6, Ni3Si, and W2C commonly in all the processed composite claddings. The microhardness of the claddings was measured between 791 and 1086 HV0.2 for increasing the reinforcement WC particulate percentage from 15 wt% to 60 wt%. It is about 470% surface hardness enhancement with the processed composite claddings compared with the substrate alloy. The reinforcement of WC from 15 wt% to 60 wt% with the composite claddings resulted in wear resistance enhancement from 21.85% to 60.64% and the coefficient of friction from 56.87% to 77.92% against the substrate. The wear-rate maps and their respective cladding's worn surface morphology have described the wear mechanisms typically as adhesive, abrasive, oxidation, and delamination. The wear mechanisms are mainly influenced by the WC particulate percentage. The increased WC particulate content has increased the dominance of the abrasive wear mechanism while reducing the window of the adhesive wear mechanism. The windows of various wear mechanisms and their ranges, such as adhesive 0.0033 to 0.028, abrasion 0.010 to 0.067, oxidation 0.012 to 0.093, and delamination 0.015 to 0.120 mm(3)/m, for NiCrBSi/WC composite claddings comprehensibly represented the wear behavior for the varied conditions of dry sliding wear parameters.