Chilled cast iron is produced__________

Explanation

Explanation: Chilled cast iron: Chilled iron is a hematite cast iron abrasive obtained by atomization , which is used for surface preparation in angular form, mainly in air blast machines. A chilled iron casting can be produced by adjusting the carbon composition of the white cast iron so that the normal cooling rate at the surface is just enough fast to produce white cast iron while the slower cooling rate below the surface will produce gray iron. It could also be used for ballast, counterweight, inoculation, and as an aggregate in high-density concrete. Important Points Other types of Cast iron: Gray cast iron: It is in the form of graphite flakes, so it is also called as flakes cast iron. The surface of gray cast iron is very rough. Due to the presence of these graphite flakes gray Cast Iron possesses high damping capacity and hence these materials are used for lathe machine beds and engine blocks. This possesses more surface roughness and low machinability due to graphite flakes. Nodular cast iron: It is produced by adding magnesium and cerium to the gray cast iron to convert graphite flakes into spherical form. Due to the spherical form of graphite in nodular cast iron, the machinability is more. Ex. Gears. White cast iron: These are produced by the fast cooling of liquid material. Due to the fast cooling rate cementite phase is form instead of graphite, and hence the white cast iron is the hardest and strongest cast iron material. These materials are used in the production of rolling mills. The annealing process is a heat treatment process which alters the microstructure of a material to change its mechanical or electrical properties. Typically, in steels, annealing is used to reduce hardness, increase ductility, and help eliminate internal stresses.