The experimental investigation consisted of casting Al-7Si alloy by rapid slurry formation(RSF) t... more The experimental investigation consisted of casting Al-7Si alloy by rapid slurry formation(RSF) technique. The RSF process is based on the enthalpy exchange between at least two alloy systems having different enthalpies, with the aim of forming a semi-solid metal slurry. Thus, slurry with 0.3 solid fraction was made by this process. Prior to starting the experiment 0.01 wt.% SiB was also added in the melt for additional grain refinement. Stirring speed was varied from 800 to 1800 rpm and for each experiment the samples were quenched in water at different time intervals; 0 min., 5 min., 10 min. and 15 min. It was observed that rapid heat extraction, nucleation and forced shearing action developed globular α-Al phase. It was also found that rotation speed, holding time and addition of Si-B grain refiner affected the average α-Al particle size. The coarsening of particles was experimentally investigated and also theoretically described by applying the LSW theory
Rapid Slurry Forming (RSF) is a new process for manufacturing of cast components. The process is ... more Rapid Slurry Forming (RSF) is a new process for manufacturing of cast components. The process is based on enthalpy exchange between at least two alloy systems having different enthalpies. The aim is to get semi-solid slurry. Experimental work has been done on Al-7Si alloy to get semi-solid slurry. The beauty of the process is that the state of slurry is controlled by relative added amounts of the alloy system used. It is not necessary to accurately control the heat flux to surrounding media such as crucible or mould. Globular microstructure of primary aluminum dendrites could thus be achieved by RSF process which ensure improved foundry characteristics. The results indicate that the RSF process is suitable for producing high quality metal slurries economically which may be a break through for semi – solid casting processes.
The experimental investigation consisted of casting Al-7Si alloy by rapid slurry formation(RSF) t... more The experimental investigation consisted of casting Al-7Si alloy by rapid slurry formation(RSF) technique. The RSF process is based on the enthalpy exchange between at least two alloy systems having different enthalpies, with the aim of forming a semi-solid metal slurry. Thus, slurry with 0.3 solid fraction was made by this process. Prior to starting the experiment 0.01 wt.% SiB was also added in the melt for additional grain refinement. Stirring speed was varied from 800 to 1800 rpm and for each experiment the samples were quenched in water at different time intervals; 0 min., 5 min., 10 min. and 15 min. It was observed that rapid heat extraction, nucleation and forced shearing action developed globular α-Al phase. It was also found that rotation speed, holding time and addition of Si-B grain refiner affected the average α-Al particle size. The coarsening of particles was experimentally investigated and also theoretically described by applying the LSW theory
Rapid Slurry Forming (RSF) is a new process for manufacturing of cast components. The process is ... more Rapid Slurry Forming (RSF) is a new process for manufacturing of cast components. The process is based on enthalpy exchange between at least two alloy systems having different enthalpies. The aim is to get semi-solid slurry. Experimental work has been done on Al-7Si alloy to get semi-solid slurry. The beauty of the process is that the state of slurry is controlled by relative added amounts of the alloy system used. It is not necessary to accurately control the heat flux to surrounding media such as crucible or mould. Globular microstructure of primary aluminum dendrites could thus be achieved by RSF process which ensure improved foundry characteristics. The results indicate that the RSF process is suitable for producing high quality metal slurries economically which may be a break through for semi – solid casting processes.
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