Abstract:
The investigation deals processes leading to local strengthening in multiphase steels, being characterized by a good formability, continuous yielding, high strength and a strong bake hardening and aging effect. Dual phase (DP) and complex phase (CP) steels have been investigated to examine the effect of thermal and mechanical processing parameters on local properties. For this purpose, two methods have been used to achieve local strengthening, namely local deformation (LD) and local heat treatment (LHT). The local deformation by means of embossing with defined pre-strains leads to enhanced hardness and strengthening. A subsequent aging treatment results in a further increase in mechanical properties. Finally, a local laser heat treatment leads to an increase of hardness and strength and to local strengthening of the material. Local aging on the adjusted strength could be confirmed as well as the stability of the local strengthening.
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