Alnico, an alloy used extensively for permanent magnets contains iron, nickel, aluminium and cobalt in the following ratio

Engineering Materials
Alnico, an alloy used extensively for permanent magnets contains iron, nickel, aluminium and cobalt in the following ratio

50 : 20 : 20 : 10

50 : 20 : 10 : 20

40 : 30 : 20 : 10

30 : 20 : 30 : 20

50 : 20 : 20 : 10

50 : 20 : 10 : 20

40 : 30 : 20 : 10

30 : 20 : 30 : 20

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Engineering Materials
Ductile cast iron

Is produced by annealing process. It is soft, tough and easily machined metal

Is produced by small additions of magnesium (or creium) in the ladle. Graphite is in nodular or spheroidal form and is well dispersed throughout the material

Contains 1.7 to 3.5% carbon in Free State and is obtained by the slow cooling of molten cast iron

Is also known as chilled cast iron and is obtained by cooling rapidly. It is almost unmachinable

Is produced by annealing process. It is soft, tough and easily machined metal

Is produced by small additions of magnesium (or creium) in the ladle. Graphite is in nodular or spheroidal form and is well dispersed throughout the material

Contains 1.7 to 3.5% carbon in Free State and is obtained by the slow cooling of molten cast iron

Is also known as chilled cast iron and is obtained by cooling rapidly. It is almost unmachinable

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Engineering Materials
The lower critical point for all steels is

700°C

913°C

600°C

723°C

700°C

913°C

600°C

723°C

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Engineering Materials
Drop forging dies contain carbon of the order of

0.6 to 0.7%

0.25 to 0.5%

0.1 to 0.2%

0.7 to 0.9%

0.6 to 0.7%

0.25 to 0.5%

0.1 to 0.2%

0.7 to 0.9%

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Engineering Materials
Process of Austempering results in

Martenistic structure

Formation of bainite structure

Lamellar layers of carbide distributed throughout the structure

Carburised structure

Martenistic structure

Formation of bainite structure

Lamellar layers of carbide distributed throughout the structure

Carburised structure

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Engineering Materials
The main alloying elements high speed steel in order of increasing proportion are

Tungsten, chromium, titanium

Tungsten, titanium, vanadium

Vanadium, chromium, tungsten

Chromium, titanium, vanadium

Tungsten, chromium, titanium

Tungsten, titanium, vanadium

Vanadium, chromium, tungsten

Chromium, titanium, vanadium

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Engineering Materials

Engineering Materials Alnico, an alloy used extensively for permanent magnets contains iron, nickel, aluminium and cobalt in the following ratio

Engineering Materials Ductile cast iron

Engineering Materials The lower critical point for all steels is

Engineering Materials Drop forging dies contain carbon of the order of

Engineering Materials Process of Austempering results in

Engineering Materials The main alloying elements high speed steel in order of increasing proportion are

Engineering Materials
Alnico, an alloy used extensively for permanent magnets contains iron, nickel, aluminium and cobalt in the following ratio

Engineering Materials
Ductile cast iron

Engineering Materials
The lower critical point for all steels is

Engineering Materials
Drop forging dies contain carbon of the order of

Engineering Materials
Process of Austempering results in

Engineering Materials
The main alloying elements high speed steel in order of increasing proportion are