SLIDING WEAR BEHAVIOR OF NIOBIUM CARBIDE COATED AISI 52100 BEARING STEEL
Krelling, Anael Preman; Milan, Julio César Giubilei; Costa, César Edil da; Almeida, Elisangela Aparecida dos Santos; Galiotto, Alexandre
Sliding wear behavior of niobium carbide coated AISI 52100 bearing steel balls against AISI 1045 quenched steel discs was investigated. Thermo-reactive diffusion (TRD) treatment was carried out at 1000 °C for 4 hours by pack cementation method. NbC phase with 11 µm in thickness was identified by SEM microscopy and XRD technique. Ball-on-disc wear tests were carried out without lubrication under 2 and 10N load at sliding speeds of 0.1 and 0.3 m/s. A 300% increase in sliding speed resulted in 24% and 27%, increasing in friction coefficient of niobium carbide coated AISI 52100 steel balls for 2N and 10N. Wear resistance of AISI 52100 steel was improved up to 78 times after TRD treatment depending on applied load and sliding velocity. Wear mechanisms are adhesive-oxidative for hardened balls and abrasive-oxidative for coated balls against hardened AISI 1045 steel discs.
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