Daniel Berglund:
Hot stamped components with tailored properties-simulation and validation of product performance
Simultaneous forming and quenching, hot stamping, press hardening, tailored properties, passive safety car components
Simultaneous forming and quenching is a method for manufacturing light and ultra high strength components. The process is often referred to as hot stamping or press hardening and is mainly used for producing passive safety components such as side impact beams, bumper beams, A- and B-pillars and different types of reinforcement components. Generally, the microstructure in the hot stamped components consists of martensite or a mix of martensite and bainite, but there is a strong need from several OEM (original equipment manufacturer) to design car bodies with components having varying properties, sometimes referred to as products with tailored properties. The main objective in this work is to validate a model with predicted mechanical properties from the hot forming analysis by comparing the force response during a four-point bending test. A secondary objective is to investigate the crack sensitivity around spot welds positioned in the soft zone and suggest a material grade to avoid crack initiation in the heat affected zone.
Components with tailored properties can be created by hot stamping using temperature controlled tool surfaces (tool technology). Material grades with a yield stress of 375, 400, 450 and 500 MPa were manufactured and hat profiles with the 400 MPa yield stress grade were used in this investigation.
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