Dry Sliding Wear Resistance of Fe-Cr-C hardfacing Deposited by Flux-Core-Double-Wire GTAW

Gas-Shielded Tungsten Arc Welding (GTAW) was modified to a Flux-Cored-Double-Wire GTAW (FCDW-GTAW); in this technique, wires of different compositions are used simultaneously obtain microstructures. In the GTAW, automatic flux-cored double-wire with combination four deposited AISI1020 steel, allowing Pin-on-disk wear tests described by ASTM G99 evaluate coefficients hardfacing materials combining Fe–Cr–C, Fe-Cr-C-Nb, Fe-Cr-C-Mo-Nb, and Fe-Cr-C-Mo-Ti alloys. The these resulted hypoeutectic microstructure niobium titanium carbides, an average hardness 650 HV0.3, hypereutectic microstructures formed contents, microhardness range from 820 1020 HV0.3. were performed without lubrication at room temperature, using 6.0 mm diameter polished alumina sphere as counter-body. total distance covered 1000 m speed 0.1 m/s, track radius cm, applied load 10 N. Hardness, microstructure, coefficient, mechanisms compared. results showed that resistance could be differentiated predominant mechanism: polishing for cracking ones.