The effect of mechanical behavior on bendability of ultrahigh-strength steel

Bendability is an important property of ultrahigh-strength steels since the typical applications such materials include structures manufactured by air-bending. Conventional methods to evaluate bendability, as bending test according standard VDA-238 or conventional tensile do not provide sufficient information bendability due average nature material response in these tests. In this study, mechanical properties were determined using thin specimens cut from surface sheet and evaluation was carried out frictionless The results experiments FE-modelling presented paper reveal that have a significant impact on bendability. Novel steel with better work-hardening capacity at caused layer relatively soft ferrite lower bainite has good especially when bend line aligned transverse rolling direction. Microstructural investigations hard microstructure, deformation localizes into shear bands eventually lead fracture, but similar banding present novel surface. This can be attributed which delays onset localization fracture.