Use a schematic to show and label the main microstructural features of a sand ca
ID: 1853236 • Letter: U
Question
Use a schematic to show and label the main microstructural features of a sand casting. Explain how the microstructure would change if the same metal is cast using a permanent die mold. If a nucleating agent was added to the liquid casting show how the microstructure would change. How would this change affect the mechanical properties of the casting? Define the Chvorinov rule and explain which type of defect it is used to prevent in a casting. a spherical casting of diameter 10 cm has a cylindrical riser of 5 cm in diameter and 10 cm high. Use the Chvorinov's rule to determine if there will be any internal defects in the casting. [8] [note: Volume of a sphere is 4/3pi3 and volume of a cylinder is pir2h. The surface area of a sphere is 4pir2 and the surface area of a cylinder is 2pir2 + 2pirh]Explanation / Answer
Chvorinov's Rule: -A casting with a higher volumetosurface area ratio cools and solidifies more slowly than one with alower ratio. -To feed molten metal to main cavity,TSTfor riser must greater than TST for main casting. -Since riser and casting mold constants will be equal,design the riser to have a larger volumetoarea ratio so that the main casting solidifies first This minimizes the effects of shrinkage refer this for whole information: http://www.scribd.com/doc/20522169/11/CHVORINOV%E2%80%99S-RULE
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