Microstructure-based RVE modeling of ductile failure induced by plastic strain localization in tailor-tempered 22MnB5 boron steel

•Microstructure-based 2D-RVE models are proposed via reliability and mesh-size sensitivity evaluation.•Plane stress state leads to local shear failure while plane strain results in thickness necking.•Bainite ductility significantly affect the failure mode of tailor temper 22MnB5.•Fracture modes and ductility distinguish with various martensite volume fraction.