Engineering Materials
Thermoplastic materials are those materials which

Are flexible and can withstand considerable wear under suitable conditions
Are used as a friction lining for clutches and brakes
Do not become hard with the application of heat and pressure and no chemical change occurs
Are formed into shape under heat and pressure and results in a permanently hard product

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Engineering Materials
In process annealing, the hypo eutectoid steel is

Heated from 30°C to 50°C above the upper critical temperature and then cooled slowly in the furnace
Heated below or closes to the lower critical temperature and then cooled slowly
Heated from 30°C to 50°C above the upper critical temperature and then cooled suddenly in a suitable cooling medium
Heated from 30°C to 50°C above the upper critical temperature and then cooled in still air

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Engineering Materials
Amorphous material is one

In which atoms align themselves in a geometric pattern upon solidification
Which emits fumes on melting
In which there is no definite atomic structure and atoms exist in a random pattern just as in a liquid
Which is not attacked by phosphorous

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