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Local laser strengthening of steel sheets for load adapted component design in car body structures

: Jahn, A.; Heitmanek, M.; Standfuß, J.; Brenner, B.; Wunderlich, G.; Donat, B.

Postprint (1.4 MByte; PDF; )

Schmidt, M. ; Wissenschaftliche Gesellschaft Lasertechnik -WLT-:
Lasers in Manufacturing 2011, Sixth International WLT Conference on Lasers in Manufacturing. Proceedings : May 23-26, 2011, München; LiM 2011
Amsterdam: Elsevier, 2011 (Physics Procedia 12.2011, Pt.1)
ISSN: 1875-3892
International Conference on Lasers in Manufacturing (LIM) <6, 2011, München>
Konferenzbeitrag, Zeitschriftenaufsatz, Elektronische Publikation
Fraunhofer IWS ()

The current trend in car body construction concerning light weight design and car safety improvement increasingly requires an adaption of the local material properties on the component load. Martensitic hardenable steels, which are typically used in car body components, show a significant hardening effect, for instance in laser welded seams. This effect can be purposefully used as a local strengthening method. For several steel grades the local strengthening, resulting from a laser remelting process was investigated. The strength in the treated zone was determined at crash relevant strain rates. A load adapted design of complex reinforcement structures was developed for compression and bending loaded tube samples, using numerical simulation of the deformation behavior. Especially for bending loaded parts, the crash energy absorption can be increased significantly by local laser strengthening.