Stacking fault energy
Stacking fault energy is the energy required to disturb the atomic order in a crystal lattice. It influences plastic deformation by slip or twinning.
Physicochemical mechanism of action
Stacking fault energy refers to the energy required to disrupt the normal atomic layer sequence in a crystal lattice. This can occur through the sliding of atoms or the formation of twin structures.
Metallurgical relevance & risks in welding
High stacking fault energy increases the hardness and stress resistance of a material, making it harder to deform plastically. This can lead to stress buildup and possible cracks, especially at high temperatures or under mechanical load. If the stacking fault energy content is too high, the weld seam can become faulty and unreliable.
Workshop practice & instructions
To control stacking fault energy, it is important to regulate the melting process precisely. This includes correct selection of welding material, proper temperature and cooling time, and the use of suitable deoxidizers. For high-strength materials like steel or nickel, careful control of stacking fault energy is crucial to avoid cracks and stress buildup.