Degree of supercooling
Supercooling degree is the difference between the theoretical melting temperature and the actual cooling temperature. High supercooling can lead to crack-prone structures.
Physical-Chemical Mechanism of Action
The degree of supercooling refers to the difference between the melting temperature of a metal (theoretical phase transformation temperature) and the actual temperature to which it is cooled. At high degrees of supercooling, the metal stays longer in the liquid phase and cools down more slowly.
Metallurgical Relevance & Risks in Welding
High supercooling can lead to crack-prone structures like martensite, which have low toughness and ductility. This can result in cracks and deformation in the weld metal.
Workshop Practice & Action Guidelines
To control the degree of supercooling, it is important to carefully set up the cooling conditions of the metal. This can be achieved by choosing the right welding methods and parameters (e.g., voltage, temperature). For steels with high carbon content, controlled cooling is particularly important to avoid crack-prone structures.