Critical Degree of Recrystallization
The critical recrystallization degree is the maximum plastic deformation degree at which no further grain growth occurs after annealing. If this degree is exceeded, the material becomes too soft and unacceptably weakened.
Physical-Chemical Mechanism of Action
The critical recrystallization degree is the point beyond which the crystal structure of the material doesn't grow further after annealing. This degree depends on the metal's properties and the ambient temperature.
Metallurgical Relevance & Risks in Welding
If the plastic deformation degree exceeds the critical recrystallization degree, the material can become too soft after annealing. This reduces strength and toughness, increases crack susceptibility, and shortens component life.
Workshop Practice & Action Guidelines
To avoid the critical recrystallization degree, keep plastic deformation during welding as low as possible. Achieve this by choosing the right welding process and correct parameters. For steels with a high critical recrystallization degree, careful temperature control during annealing is especially important.