1. austenite
2. martensite
3. pearlite
4. cementite
martensite
1. contains 1.7 to 3.5% carbon in free state and is obtained by cooling of molten cast iron
2. is produced by annealing process. I is soft, tough and easily machine metal
3. is produced by small additions o magnesium(or cerium) in the ladle Graphite is in nodular or spheroida form and is well dispersed throughout the material
4. none of the above is true
contains 1.7 to 3.5\% carbon in free state and is obtained by cooling of molten cast iron
1. high machinability
2. low melting point
3. high tensile strength
4. all of the above
all of the above
1. improves wear resistance, cutting ability and toughness
2. refines grain size and produces less tendency to carburization, improves corrosion and heat resistant properties
3. improves cutting ability and reduces hardenability
4. gives ductility, toughness, tensile strength and anticorrosion properties
gives ductility, toughness, tensile strength and anticorrosion properties
1. copper
2. chromium
3. nickel
4. silicon
copper
1. it easily machinable
2. it brittle
3. it hard
4. the casting unsound
the casting unsound
1. 3- 5
2. 5-7
3. 7-10
4. 10-15
5-7
1. cast iron
2. pig iron
3. wrought iron
4. malleable iron
pig iron
1. cast iron
2. pig iron
3. wrought iron
4. malleable iron
cast iron
1. silicon and sulphur
2. phosphorous, lead and sulphur
3. sulphur, graphite and aluminum
4. phosphorous and aluminum
phosphorous, lead and sulphur