Cast Iron
Cast Iron
Cast Iron
Metals Classification
TYPES
Remaining Percentage is Iron. Grey colour is due to carbon is present in the form of Free Graphite
Properties:
1. High Compressive strength. 2. Low tensile strength.
3. No ductility.
4. Easily Machined to get a good finish. 5. Good fatigue resistance.
Shrinkage) 7. Melting Point around 1130 to 1250 degrees. 8. Able to absorb vibrations.
Applications
1. Where sliding action is required this material is Used. 2. Machine tool bodies (bed, frame) 3. Automotive cylinder blocks, heads, Housings, Flywheels. 4. Water Pipes for underground purposes. 5. Piston rings.
Microstructure
Characteristics
Gray iron is basically is an alloy of carbon & silicon with Iron.
Properties..
White cast irons are formed with silicon less content and
rapidly cooling rate resulting in carbon existing in cementite instead of graphite and the fracture surface appears as white and are termed as white cast iron.
High Tensile Strength.
Shaping process. Abrasion resistant. Brittleness can be reduced by reducing carbon content. Because of more cementite present, the white iron is very hard and brittle.
MICROSTRUCTURE:
hammered & rolled to obtain different shapes. It is obtained from Hard and Brittle white iron through a controlled heat conversion process. An alloy malleable cast iron contains chromium and Nickel which possesses high strength and corrosion resistance. It possess high yield strength.
of thermal expansion. Good wear resistance and vibration damping capacity. It can be used from -51 degrees to 649 degrees Moderate cost
fracturing the material. Tensile strength is higher. Excellent Machining Qualities. It is used for machine parts for which steel forgings would be too expensive and in which the metal should have a fair degree of accuracy. It is Separated by using Whiteheart Process and Blackheart Process.
Applications
Rail Road
Camshafts Wrenches
Spanners
Crankshafts
(Ce) to gray Cast iron before casting produces a microstructure having Nodule (or) Sphere like structure instead of flakes. The matrix surrounding these spherical particles may be pearlite or Ferrite depending on heat treatment and it is normally pearlite for cast piece.
Properties
More Stronger and Ductile than Grey cast iron. Very good machinability. Castability and Wear resistance.
Applications
Pumps and compressors, I.C Engines, Power transmission equipments, Earth moving Machinery. Paper Industries Machinery. Valves and Fittings.