Microstructure and Mechanical properties of A356 alloy Castings made in Sand and Granulated Blast Furnace Slag Moulds

Abstract

Investigations were focused on structure property evaluation of castings made through Granulated blast furnace (GBF) slag and silica sand moulds. Sodium Silicate-CO2 process was used for making the necessary moulds. Three types of moulds were made with slag, silica sand individually and combination of these two. A356 alloy castings were performed on these newly developed slag moulds. Results reveal that the castings were performed successfully in all the moulds. Cast products with good surface finish, no surface defects and without porosity were produced by slag moulds. Faster heat transfer in slag moulds enabled the obtained castings with enhanced metallurgical and mechanical properties. Consistent and uniform hardness on the cross section of the specimen was obtained in all the materials made through sand, slag and mixed moulds. Improved hardness, compression, tensile and impact properties were observed in all the materials made through GBF slag moulds. Based on these present investigations can conclude that GBF Slag moulds can make a way for producing the castings with improved surface finish and enhanced properties while reduced operational costs.