Analysis of Tensile Strength and Hardness of Al-Si alloy Using Sand Casting and Centrifugal Casting Methods

Casting using the sand casting and centrifugal casting methods each has advantages and disadvantages. The advantages of the sand casting method are low cost, simple process but the disadvantages is prone to defects. Centrifugal casting has the advantages of being able to make uniform work pieces but the disadvantages equipment and maintenance costs are expensive. The aims of this study was to compare the tensile strength and hardness of the sand casting and centrifugal casting methods. The material used ini this study is Al-Si alloy. The sand used in casting comes from Kelud Mount, while the centrifugal casting uses a horizontal mold. Tensile test procedure using ASTM-E8 standard and hardness test procedure using ASTM-E92. The results showed that the highest tensile strength and hardness in the sand casting method are 151.25 MPa and 126.1 HV respectively. Meanwhile, in centrifugal casting, the highest tensile strength and hardness are 162.86 MPa and 132.74 HV respectively.