Microsegregation within Dendritic Regions
Microsegregations are local concentration differences of alloying elements within a crystallite. They arise from uneven solidification and lead to mechanical and corrosive inhomogeneities.
Physical-chemical mechanism of action
Microsegregation is a local concentration difference of alloying elements within a crystallite. It arises from uneven solidification and leads to mechanical and corrosive inhomogeneities.
Metallurgical relevance & risks in welding
Microsegregation can impair the mechanical strength and corrosion resistance of the material. It causes local stress areas that can lead to cracks or hot cracks. Furthermore, it can shorten the service life of the weld under chemical influences.
Workshop practice & instructions
To minimize microsegregation, it is important to ensure uniform solidification. This can be achieved by choosing the right welding process and the correct process parameters. For steels with a high alloy concentration, low cooling rates and a controlled cooling rate should be preferred.