3D synchrotron laminography assessment of damage evolution in blanked dual phase steels

摘要：

　　The mechanical performance of automotive structures made of advanced high strength steels (AHSS) is often seen reduced by the presence of cut-edges.Here an attempt is made to gain insight into the initial damage state and the damage evolution during loading of a cut-edge.This is assessed in 3D and in-situ by synchrotron laminography observation during simultaneous tensile and bending loading of a cut-edge produced by stamping.Laminography is a technique that allows to observe regions of interest in thin sheet-like objects.It is found for the DP600 laboratory steel grade that the fracture zone is very rough and that needle voids from the surface and in the material bulk follow ferrite-martensite flow lines.During loading the needle voids grow from the fracture zone surface and coalesce with voids in the bulk.The needle cracks coalesce with the burnish zone though narrow zones,called void sheets.The formed cracks are inclined by 45°compared to the load direction.

关键词： Dual phase steels cutting edges X-ray laminography damage

作者: Mouhcine Kahziz Thilo Morgeneyer Matthieu Mazière Lukas Helfen Eric Maire Olivier Bouaziz

作者单位: ArcelorMittal Research S.A.,voie Romaine,F-57239 Maizières-lès-Metz,France;Mines ParisTech,Centre de Mines ParisTech,Centre des Matériaux,UMR CNRS 7633,BP 87,91003 Evry Cedex,France Institute for Synchrotron Radiation-ANKA,Forschungszentum Karlsruhe,D-76021 Karlsruhe,Germany Université de Lyon,INSA-Lyon,MATEIS CNRS UMR 5510,20 avenue Albert Einstein,69621 Villeurbanne,Franc

会议类型: 国际会议

会议名称: 第13届国际断裂大会(ICF2013)

会议地点: 北京

会议语种:英文

页码: 1-8

在线出版日期: 2013-06-16（万方平台首次上网日期，不代表论文的发表时间）