Retardation of plastic instability via damage-enabled microstrain delocalization

摘要: Multi-phase microstructures with high mechanical contrast phases are prone to microscopic damage mechanisms. For ferrite–martensite dual-phase steel, for example, mechanisms such as martensite cracking or martensite–ferrite decohesion activated deformation, and discussed often in literature relation their detrimental role triggering early failure specific steel grades. However, both the micromechanical processes involved direct influence on macroscopic behavior quite complex, a deeper understanding thereof requires systematic analyses. To this end, an experimental–theoretical approach is employed here, focusing three model each deformed different strain paths. The of observed investigated detail by in-situ scanning electron microscopy tests, quantitative analyses, finite element simulations. comparative analysis reveals unforeseen conclusion that nucleation may have beneficial effect ideally designed (with effective crack-arrest mechanisms) through delocalization.