Solder Segregation Effect
The solder segregation effect is a local inhomogeneity in multi-component alloys when solidification is too slow. It can cause brittle phases in the microstructure.
Physical-Chemical Mechanism of Action
When welding or forming multi-component alloys, a local inhomogeneity occurs when the material structure solidifies too slowly. This causes certain phases not to be evenly distributed, creating brittle areas in the microstructure.
Metallurgical Relevance & Risks in Welding
The alloy segregation effect can lead to unwanted brittle phases that make the material more susceptible to cracking and degradation. This increases the risk of hot cracking and reduces the mechanical properties of the weld.
Workshop Practice & Action Guidelines
To minimize the alloy segregation effect, it is important to ensure rapid cooling after welding. This can be achieved by using cooling water or special cooling gases. The cooling rate should be set so that the material cools between 5 and 25 seconds in the critical temperature window (t8/5).