Engineering Materials
When medium carbon steel is heated to coarsening temperature

The average grain size is a minimum
The grain size first increases and then decreases very rapidly
The grain size increases very rapidly
There is no change in grain size

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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 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
Heated below or closes to the lower critical temperature and then cooled slowly

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