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
In process annealing, the hypo eutectoid steel is

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 in still air
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

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Engineering Materials
Cyaniding is the process of

Dipping steel in cyanide bath
Adding carbon and nitrogen by heat treatment of steel to increase its surface hardness
Obtaining cyanide salts
Reacting steel surface with cyanide salts

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