Recently, newly developed bake-hardenable (BH) steel sheets strengthened by copper sulfide (CuS) have been successfully employed in commercial production lines that supply automotive outer panels. The metallurgical concepts governing fabrication of these new BH steel sheets require keeping carbon content as low as 0.0015wt.% without any additional amount of titanium and/or niobium for solute carbon scavenging. The role of CuS precipitates has turned out to raise the yield strength acting as a barrier against dislocation movement. On the other hand, the most important goal for developing the new-typed steel sheets is focused on the achievement of the extreme surface quality of galvannealed steel sheets to fulfill the high aesthetical requirements for defect-free automotive outer panels. The shape and distribution of the surface enrichments of Mn, Al and O on the galvannealed steel sheets were characterized by OM, SEM and TEM.
Surface charakterization of newly developed Cu-bearing bake-hardening steel sheets for automative exposed panel
Oberflächencharakterisierung von neu entwickelten kupferhaltigen Bake-Hardening-Stahlblechen für Kraftfahrzeugteile
2011
8 Seiten, 10 Bilder, 14 Quellen
Conference paper
Storage medium
English
Development of Cu-bearing bake-hardenable steel sheets for automotive exposed panels
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