Eutectic Solidification
Eutectic solidification: Simultaneous crystallization of two or more solid phases from a liquid melt at a constant temperature. Minimizes the free enthalpy and leads to finely dispersed microstructures.
Physicochemical mechanism of action
In eutectic solidification, two or more solid phases crystallize simultaneously from a liquid melt at a fixed temperature. This process reduces the free enthalpy of the system and forms a finely dispersed structure, which leads to increased strength and toughness.
Metallurgical relevance & risks in welding
Eutectic solidification is particularly important in the alloying of steels with a high carbon content and other additions such as molybdenum. Incorrect cooling steps can cause the structure not to solidify properly and weaken the weld. This increases susceptibility to cracking and reduces toughness.
Workshop practice & instructions
To ensure successful eutectic solidification, the melt must be cooled at the correct temperature. This requires precise control of the cooling steps and often special cooling programs. For steels with a high carbon content, continuous, uniform cooling is essential to achieve the desired finely dispersed structure.