Defects characterization of Al-brass composite produced via centrifugal process

Centrifugal casting is one of the methods which is used for producing bimetallic composite parts. This method runs both horizontal and vertical mode. Vertical mode, used in this work, is currently taken to produce casting parts with height to diameter ratio less than unity. In this study, aluminum melt with 1.5 and 2.5 melt-to-solid volume ratio was cast into 100°C preheated brass bush rotating at 800, 1600, and 2000 (rpm), respectively. In order to characterize the cast samples, possible phases and casting defects various equipment such as optical microscope (OM), scanning electron microscopy (SEM) and energy dispersive X-ray spectroscopy (EDS) have been used. Flowing of Al melt, at centrifugal field, is possibly associated with surface oxide film rupture so that metallurgical bonding is attained. On the other hand, these oxide films flowing at the melt surface and inherent turbulence of this process may cause defects in the casting. It was noted that bimetal composites produced at 2000 rpm are subjected to more defects than the other. This article categorizes various defects seen and analyzes different effective parameters.