Rao, R.A.Tattimani, M.S.Rao, S.S.2026-02-052015Materials and Manufacturing Processes, 2015, 30, 11, pp. 1305-131110426914https://doi.org/10.1080/10426914.2015.1019093https://idr.nitk.ac.in/handle/123456789/26190The objective of this article is to investigate the appearance, microstructure, and hardness of Al-Si alloys Al-12Si and Al-17Si in vertical centrifugal casting process. During rotation of the mold, molten metal flow affects the formation of uniform cylinder. In this study, flow of molten metal for Al-Si alloys at different rotational speeds is focused. It is found that for Al-17Si alloy a uniform cast tube is observed for 1000 rpm, whereas for Al-12Si it is at 1200 rpm; above and below these speeds, irregular cast tubes are formed. Finally, fine structured grain size with high hardness value is found in a uniform cast tube in comparison with others. © 2015 Taylor & Francis Group, LLC.AlloysCentrifugal castingHardnessLiquid metalsMicrostructureSiliconSilicon alloysTubes (components)Al-Si alloyGrain sizeHigh hardnessMelt flowMolten metal flowRotational speedSi alloysVertical centrifugal castingsAluminum