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Engineering Materials

Engineering Materials
Which of the following when used in ordinary low carbon steels, makes the metal ductile and of good bending qualities?

Phosphorus
Silicon
Sulphur
Manganese

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Engineering Materials
Pearlite consists of

6.67% carbon and 93.33% iron
13% cementite and 87% ferrite
13% ferrite and 87% cementite
13% carbon and 87% ferrite

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Engineering Materials
High carbon steel carries carbon percentage

0.1 to 0.3%
0.3 to 0.6%
0.6 to 0.8%
0.8 to 1.5%

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Engineering Materials
Vanadium in high speed steels

Provides high hot hardness
Forms very hard carbides and thus increases wear resistance
Promotes decarburisation
Promotes retention of austenite

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Engineering Materials
The lower critical point for all steels is

700°C
913°C
600°C
723°C

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Engineering Materials
Which is false statement about tempering? Tempering is done to

Release stresses
Improve toughness
Improve ductility
Improve machinability

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