Sprecher
Beschreibung
Duplex steels (DS) combine the excellent mechanical properties of ferrite with the corrosion resistance of austenite and are used for components exposed to fatigue loading, such as offshore equipment. The cyclic behavior of DS is influenced by the properties of the two phases, their volume fractions, and their crystallographic orientations, which lead to varying degrees of incompatibility in deformation within the microstructure. This results in fatigue cracks that can form both within each phase and along the phase boundaries.
In the context of a digital material twin, Fatigue Indicator Parameters (FIPs) are used to assess the microstructure-dependent initiation of fatigue cracks and early crack growth. FIPs, in the context of crystal plasticity, are derived from finite element simulations based on models of real microstructures. These simulations provide surface-specific insights into localized phenomena associated with fatigue.
This work enables the detailed fatigue life assessment of duplex steels with digital material twins.
