Incubation period of pearlite stage
The incubation time of the pearlite stage is the time during which undercooled austenite is ready before the start of nucleation and growth of lamellar pearlite.
Physical-Chemical Mechanism of Action
The incubation time refers to the phase in which the undercooled austenite remains stable before it is transformed into pearlite. This process depends on the specific properties of the steel and the environmental conditions.
Metallurgical Relevance & Risks in Welding
An overly short incubation time can lead to insufficient pearlite formation, which impairs the toughness and deformability of the weld. An overly long incubation time can lead to over-pearlitization and thus increased hardness and lower durability.
Workshop Practice & Action Guidelines
To ensure optimal pearlite formation, it is important to carefully control the cooling conditions and the cooling medium. The incubation time should generally be between 10 and 30 seconds, depending on the specific properties of the steel. If you have questions about exact handling, it is advisable to consult the manufacturer's instructions or a metallurgist.