Effect of heat treatment on the hardness and wear characteristics of NiCrBSi laser clad deposited on AISI410 stainless steel

In the present study, NiCrBSi alloy clad layer is deposited on AISI410 stainless steel using a high power diode laser. Cladded samples were heat treated at a temperature of 625 °C for 1.5 h and further its effect on the hardness, friction and wear characteristics were studied. Structural and microstructural characteristics of as-deposited and heat-treated samples were studied using x-ray diffraction (XRD) method and scanning electron microscopy (SEM), respectively. Heat treated NiCrBSi clad layer exhibited high hardness (∼1056 HV) in comparison to that of the as-deposited clad layer ((∼755 HV). Improved wear resistance was observed with the heat treated samples under dry sliding conditions against WC-Co ball, which is attributed to the formation of additional boride/carbide precipitates in the coatings during heat treatment. Wear track analysis under SEM and energy dispersive spectroscopy (EDS) revealed adhesive wear as the predominant wear mechanism.

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