Luleå University of Technology
The automotive industry is currently developing sustainable solutions to overcome challenges and regulations such as safety requirements, fuel efficiency, and exhaust emissions. The reduction of vehicle weight stands as a promising approach for enhancing fuel efficiency, opening new design opportunities for vehicle body structures. This strategy centers on the development of components possessing ultra-high strength. Press hardening steels (PHS) stand out as an excellent choice when designing vehicle components due to their ultra-high strength and good formability. However, it is important to consider that the increase in strength may raise concerns about the crashworthiness properties due to the trade-off between strength and toughness. The current work investigates the influence of processing on the mechanical properties of two uncoated press hardening steels (conventional PHS1500 and the more novel PHS2000). As reference material, a batch of specimens was produced from blanks produced in a press hardening line. The fracture behavior was evaluated in the frame of fracture mechanics using the J-integral measurements. Subsequently, the discussion involves a comparison of the absorbed energy with the fractography and microstructure features observed.
Abstract
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