Segregation Banding
Segregation bands are linear enrichments of alloying elements in the metal structure, formed by directional solidification or deformation. They lead to anisotropic mechanical properties and can cause cracks.
Physical-Chemical Action Mechanism
Segregation bands form when certain alloying elements become concentrated during cooling or deformation. This can happen through directional solidification (e.g., in welding) or mechanical deformation (e.g., in pressing).
Metallurgical Relevance & Risks in Welding
Segregation bands can lead to anisotropic mechanical properties, meaning the material's mechanical properties differ in different directions. This can cause cracks and deformation in the part, especially under load or at high temperatures.
Workshop Practice & Action Guidelines
To minimize segregation bands, it's important to ensure controlled cooling and uniform deformation during welding. This can be achieved by choosing the right welding process (e.g., TIG welding), controlling welding parameters (temperature, voltage), and using water cooling or other cooling methods.