Dendritic solidification structure
Dendritic solidification structure forms during the cooling of melts into a tree-like crystal network. This leads to characteristic microstructural segregations and can affect mechanical properties.
Physico-chemical mechanism of action
During the cooling of melts, dendritic solidification structure forms into a tree-like crystal network. This happens due to directed heat dissipation and concentration gradients, which cause the crystal growth to proceed in the direction of cooling and spread like the branches of a tree.
Metallurgical relevance & risks during welding
The dendritic solidification structure can affect the mechanical properties of the material. It leads to characteristic microstructural segregations, which increase hardness and toughness but can also reduce ductility. This can lead to stress concentrations and possible cracks, especially when the material is under mechanical stress.
Workshop practice & instructions
To minimize dendritic solidification structure and optimize the mechanical properties of the material, it is important to carry out controlled cooling. This can be achieved by choosing the right welding process (e.g., TIG welding) and adhering to specific temperature profiles. For steels with high carbon content, slow cooling is particularly important to reduce the risk of cracking.