Universitat Politècnica de Catalunya
Advanced High Strength Steels (AHSS), such as the Complex-Phase (CP) steels, are used as lightweight solutions for vehicles, mainly focusing on the Body-in-White. However, the implementation of such steels for chassis parts requires a profound knowledge of the key design parameters for these components, in particular those concerning fatigue performance. In this sense, when the steel sheets are subjected to mechanical cutting operations, the deformation and damage induced at the cut-edge may affect the fatigue resistance of the parts in service. To characterize and study this critical area, damage and micromechanical properties have been evaluated at the cut edge of CP800 and CP980 with two different cutting clearances, and also with and without sandblasting treatment. High-speed nanoindentation maps of 200x400 µm2 have been carried out in the three different target zones: smooth cut, fracture and burr. In the hardness maps, the deformation lines and the gradient of hardness with increasing distance from the cut edge are perfectly observed. Residual stresses at the target zones of the cut edges were measured using FIB-DIC method to complement the micromechanical study in these critical areas.
Abstract
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