Incoherent Particle Precipitation
Incoherent particle precipitation: secondary phases with an independent crystal lattice that are not continuously bonded to the matrix. This reduces lattice distortions and improves mechanical properties.
Physico-chemical mechanism of action
Incoherent particle precipitation refers to the process in which secondary phases form in a metal that have an independent crystal lattice and are not continuously connected to the matrix. These phases can form through various methods such as cooling or chemical reactions.
Metallurgical relevance & risks in welding
Incoherent particle precipitation has positive effects on the mechanical properties of the material because it reduces lattice distortions and increases strength. However, an uncontrolled precipitation process can lead to a finer distribution, which can impair the quality of the weld. An excessively high content of incoherent particles can also lead to the formation of cracks or deformations.
Workshop practice & operating instructions
To ensure optimal incoherent particle precipitation, it is important to precisely control welding parameters such as temperature and time as well as additives. For certain steels or metal alloys, a special additive (such as silicon) can be used to support the precipitation process. It is also important to ensure careful cooling of the weld to ensure continuous connection between matrix and secondary phases.