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

Chromium, titanium, vanadium
Vanadium, chromium, tungsten
Tungsten, chromium, titanium
Tungsten, titanium, vanadium

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Engineering Materials
In spheroidising process, the steel is

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

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Engineering Materials
Recrystallization temperature is one

At which change of allotropic form takes place
At which new spherical crystals first begin to form from the old deformed one when a strained metal is heated
At which crystals grow bigger in size
At which crystals first start forming from molten metal when it is cooled

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Engineering Materials
Amorphous material is one

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

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Engineering Materials
The temperature required for full annealing in hypereutectoid steel is

30° C to 50° C above lower critical temperature
30° C to 50° C above upper critical temperature
30° C to 50° C below lower critical temperature
30° C to 50° C below upper critical temperature

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