Solid solution strengthening by phosphorus
Phosphorus increases the strength of ferrous materials through lattice distortions, which hinders dislocation movement and prevents cracks.
Physicochemical mechanism of action
Phosphorus atoms are incorporated into the metal lattice. These atoms cause elastic lattice distortions that impede the movement of dislocations in atomic tubes. This inhibits the movement of damage sources such as cracks.
Metallurgical relevance & risks in welding
Solid solution strengthening through phosphorus increases the strength and toughness of the steel, offering higher resistance to mechanical loads. However, too much phosphorus (above 0.1 %) can coarsen the structure and reduce rotational strength. This can lead to damage such as cracks or fractures.
Workshop practice & instructions
To utilize solid solution strengthening through phosphorus, the phosphorus content in the steel should be between 0.05 % and 0.1 %. During welding, it is important to ensure the correct temperature and cooling time to achieve a homogeneous structure. Avoid excessive temperatures or rapid cooling, as this can lead to phosphorus coarsening.