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 spheroidising process, the steel is

Heated slightly above the lower critical temperature and then cooled slowly to a temperature of 600°C
Heated up to the lower critical temperature and then cooled in still air
Heated below the lower critical temperature and then cooled slowly
None of these

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