Engineering Materials
Which of the following represents the allotropic forms of iron?

Alpha iron, beta iron and gamma iron
Alpha iron and beta iron
Body centered cubic iron and face centered cubic iron
Alpha iron, gamma from and delta iron

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

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

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