Abstract
In the present study, friction stir diffusion cladding (FSDC); a new solid-state process based on friction stir welding, was employed for cladding ASTM 516-70 steel with Al5052-H32 alloy. The effects of tool rotation and traveling speeds on microstructural and mechanical properties of the cladded system were investigated. Tool rotation speeds of 250, 500 and 1000 rpm and traveling speeds of 50, 100 and 150 mm/min were selected for evaluation at constant zero tilt angle and tool plunge depth of 2.0 mm. It is found that the combination of high rotational and high travel speeds results in lack of fill and voids on the cladded surface, while low rotational and high travel speeds result in weak bonding at the interface with disbandment of the cladding material. Similarly, surface roughness was found to increase with the tool advance per revolution (APR). Optimum properties were obtained at a combination of rotation/travel speeds of 500 rpm/50 mm/min. Specific fracture load of about 430 N/mm was found for samples with optimum process parameters.
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