Abstract
A scratch-brushing model which is applicable for roll bonding processes is proposed. This model was suggested based on the mechanical energy transfer from a rotating brush to the surface of sheet metal in order to produce a thin brittle layer. There were good agreements between the model predictions and the experimental data from this work and the literature. The effects of annealing temperature and brushing time on the formation of the thin brittle layer and joint strength of the roll bonded sheets were also examined. It was shown that annealing temperature changed the microhardness variation along the thickness direction. The results showed that there was an optimum brushing time for attaining highest bond strength. After the optimum brushing time, the brushed surfaces were examined using scanning electron microscopy. It was also observed that the brushing direction, parallel or normal to the rolling direction, had some influence on the quality of the roll bonded sheets. For clarification of this phenomenon, the adhered interface was examined in the scanning electron microscope.
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