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In this study, a dual B–Cr coating on AISI 1010 plain carbon steel was formed by the simultaneous diffusion of B and Cr using a single-step pack cementation method. This process was performed at 950°C for 4 h using a powder mixture of different portions of boronising and chromising powders. The effect of powder composition on the microstructure, hardness and thickness of the coatings was studied. The coated samples were examined by optical and scanning electron microscopy (SEM), micro hardness measurements and X-ray diffraction analysis. Chemical composition of the coatings was analysed by energy dispersive spectrometer (EDS) and inductively coupled plasma (ICP) tests. The results revealed that Cr 7 C 3 , Fe 2 B and Fe–Cr solid solutions were the main phases existing in the coating. Formation of hard boride phase (Fe 2 B) in the dual B–Cr coating as the result of simultaneously diffusing B and Cr made this coating harder than the plain chromised coating.

Studying simultaneous borochromised coatings on low carbon steel