Abstract
The influence of bake hardening (BH) effect on laser welded hot rolled ferrite-bainite dual phase steel (FBS) with respect to the process conditions was investigated. The samples were firstly laser welded and then pre-strained. Pre-strained the samples with defined degrees of deformation and a subsequent aging treatment leads to enhanced hardness and strengthening for both conditions. The microstructure of the fusion zone (FZ) and heat affected zone (HAZ) was studied. A high volume fraction of martensite could be observed in the FZ as well as in the HAZ. Both steels exhibited a clear BH effect in both, the as-received and the laser welded conditions. The BH effect is more pronounced in the pre-strained laser welded condition.
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