Edge dislocation strain energy
The edge distortion energy in the crystal is the energy stored through the displacement of atoms at the edges of the crystal lattice. It influences the deformation behavior and hardness of the material.
Physical-Chemical Mechanism of Action
The edge distortion energy arises from the displacement or deviation of atoms at the edges of the crystal lattice. These displacements create stress in the lattice, which stores energy.
Metallurgical Relevance & Risks during Welding
High edge distortion energy can make the material more deformable and increase its hardness. If cooling after welding is insufficient, the energy can lead to crack-prone microstructures, especially when martensite forms. This can result in hot cracks and low toughness.
Workshop Practice & Instructions
To control edge distortion energy, pay attention to careful cooling after welding. For high-hardness steels with high martensite formation, use slow cooling (often over 24 hours) or perform a tempering-hardening process. For lower hardness levels, rapid cooling may be appropriate to increase deformability.