Yield Point Phenomenon
Yield point phenomenon: In stress-strain diagrams, clear upper and lower yield points appear, caused by Cottrell atmospheres of foreign atoms. This leads to localized Luders bands.
Physicochemical Mechanism of Action
Yield point phenomena occur due to interstitial foreign atoms in the metal structure. These foreign atoms form so-called Cottrell atmospheres, which influence the local environment of the material and lead to limited ductility.
Metallurgical Relevance & Welding Risks
The yield point phenomenon can lead to local cracks or deformations, especially when the material is loaded under high stress. This can impair the toughness and mechanical properties of the material.
Workshop Practice & Action Guidelines
To minimize the yield point phenomenon, it is important to carefully select welding materials and ensure that welding processes are carried out under optimal conditions. This includes proper control of temperature and stress state during welding.