چكيده به لاتين
Abstract:
In this study, first, one casting of Al-Mg alloy was produced by conventional green sand mold casting process and then three casting of same alloy were produced by ablation casting process in the same green sand mold. In ablation casting, water spraying onto the mold were started at 10, 20 and 30 seconds after pouring of the molten alloy in the mold. The microstructure and tensile properties of these castings were compared with each other. According to this comparison, the best microstructure and tensile properties were obtained in casting that was ablated in 10 seconds after pouring so that in compared with conventional casting, SDAS was decreased from 78µm to 38µm. The eutectic phases were modified from coarse and continues morphology to fine and discontinues morphology. Gas and shrinkage porosity were decreased significantly, so that the density of alloy was increased from 2.58 g/cm3 to 2.77 g/cm3 and porosity percent was decreased from 9.3% to 1.8%. Yield strength, tensile strength and elongation were increased from 153 MPa to 163 MPa, from 188 MPa to 259 MPa and from 2.3% to 12%, respectively.
Keywords: ablation casting, cooling rate, microstructure, SDAS, tensile properties
