Isothermal Annealing

Isothermal Annealing Points : Isothermal Annealing, Definition Definition It is a type of full annealing in which the steel first is cooled to the temperature at which it is desired to have transformation occur, at a rate sufficiently rapid to prevent any structural change above that temperature. The steel then is held at the selected temperature for the time necessary to complete such transformation. Thus it possible, with this process to obtain a more uniform microstructure that could be expected by continuous cooling. However, since it is necessary to drop the temperature rapidly to prevent any transformation above the desired temperature, there are definite limitations as to the mass that can be co treated. It is applicable, therefore, only to small sections and would be suitable for large bars or large load in batch type furnace since in would be impossible to cool them at a rate sufficiently rapid to prevent some transformation.