Isothermal annealing differs from conventional annealing in both process and cooling methods. Conventional annealing typically involves slowly cooling the workpiece after the heat preservation process is complete, allowing it to cool in the furnace until it reaches below 500 degrees Celsius, at which point it can be removed and air-cooled. In contrast, isothermal annealing involves heating and preserving the workpiece, then cooling it rapidly to a temperature below Ac1 and holding it there for a period to allow the Austenite to transform into Pearlite. Subsequently, it is cooled rapidly (air-cooled) to room temperature. The advantage of isothermal annealing lies in its shorter processing time and superior quality.
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