Continuous Recrystallization
Continuous recrystallization is a process where subgrain-boundary-near dislocation networks continuously grow into true high-angle grain boundaries. This occurs without the formation of new nuclei.
Physicochemical Mechanism of Action
Continuous recrystallization is a phase-transition recovery process where subgrain-boundary-near dislocation networks continuously grow into true high-angle grain boundaries. This occurs without the formation of new nuclei.
Metallurgical Relevance & Welding Risks
Continuous recrystallization can improve the microstructure of steel by increasing grain size and reducing hardness. This enhances the toughness and formability of the material. However, if cooling is too rapid, continuous recrystallization can be interrupted, leading to fine grains and increased hardness. This can cause cracking and hot cracking.
Workshop Practice & Action Instructions
To optimally utilize continuous recrystallization, it is important to ensure controlled cooling of the weld. This can be achieved by using an appropriate cooling path and adhering to cooling times. For steels with high continuous recrystallization capability, cooling times between 10 and 30 seconds should be chosen to achieve an optimum grain structure.