Micromechanics driven design of ferritic–austenitic duplex stainless steel microstructures for improved cleavage fracture toughness

Ferritic–austenitic duplex stainless steels are known to offer favorable combinations of good mechanical properties and corrosion resistance be used for structural purposes. Lean grades have already been introduced consideration replace standard 18–8 austenitic in various industrial applications. Ferrite austenite represent different deformation behaviors contribute the resulting fracture toughness characteristics. Micromechanical crystal plasticity based assessment this cleavage behavior is subject area current work. The objective bridge models full field imaging modeling microstructures ferritic–austenitic steels. goal introduce means computationally assess effects multi-phase microstructural morphologies develop both respective constitutive capabilities. Such can as an aid better resistant, while context lean, steel grades. Three investigated with differing phase morphologies, their respect response evaluated by micromechanical modeling. effect fraction morphology terms improving toughness, a critical parameter concerning these improvement properties, investigated. Deleterious features such large ferrite grain size property mismatching identified implications development applicable capabilities discussed. Simple design task varying performed using synthetic results influence on ductile-to-brittle transition.