There is a difference between the isothermal annealing and the ordinary annealing process and the cooling method. Ordinary annealing is generally followed by a slow cooling of the workpiece after the heat preservation process is completed. When the workpiece is cooled to below 500 degrees Celsius, the air cooling may be performed.
The isothermal annealing is heating and heat preservation of the workpiece, cooling at a relatively fast cooling rate to a temperature below Ac1 for a period of time, so that the austenite is isothermally decomposed into pearlite, and then cooled to a room temperature at a faster cooling rate (air cooling). Isothermal annealing consists in short time and good quality.
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