Macrosegregation in Ingots
Macrosegregation is a large-scale chemical inhomogeneity in castings or weld metal, caused by density differences and convection currents during solidification. This leads to uneven material properties.
Physical-Chemical Mechanism of Action
Macrosegregation occurs when density differences and convection currents form during the casting process. These lead to uneven cooling rates and thus to chemical inhomogeneities in the material.
Metallurgical Relevance & Risks in Welding
Macrosegregation can lead to regional variations in mechanical properties such as strength, hardness, and toughness. This increases the risk of cracks and failure of components under load.
Workshop Practice & Action Guidelines
To minimize macrosegregation, the casting processes should be designed to create homogeneous cooling conditions. This can be achieved through optimized casting geometries and controlled cooling rates.