Abstract
AbstractLaser welding of heterogeneous high‐strength steels (AHSSs) is increasingly used in the automotive industry, while the inhomogeneous microstructure of the joint could affect its fatigue crack growth (FCG) behavior. Therefore, fiber laser welding experiments were performed in this study to evaluate the microstructure, mechanical properties, and effects of notch position on FCG behavior of dissimilar laser welded DP980/QP980 joint. Results show that the hardness of fusion zone (FZ) near the QP980 side was higher and softening zones were observed in the heat affect zone (HAZ) on both sides of the joint. The stress–strain curves of all the samples show continuous yield and follow the two‐stage work hardening mechanism. The weld overmatch effect induced by laser welding could hinder the propagation of fatigue crack. The microstructural inhomogeneity, weld mismatch effect, and crack closure contribute to the variety of FCG rates. Ductile fracture mechanism became more dominant with the increase of ΔK.
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