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Microstructural Characterization and Tensile Fracture Behavior of PHS2000 in Comparison With PHS1500

Crashworthiness is an important characteristic that needs to be considered in design and engineering of vehicles or structures to ensure occupant safety during crashes or collisions. The automotive industry is working hard to develop innovative sustainable solutions, for example by aiming to use less material during manufacturing to reduce energy, with a subsequent reduction in CO2 emissions. Vehicle weight reduction stands out as a viable strategy and consequently, the development of high strength and thus light weight steel components with maintained crashworthiness properties becomes necessary. Press hardening technology emerges as a pivotal solution. This process involves heating a steel blank to the austenitization region followed by a simultaneous quenching and forming. In press hardening, thin sheets with ultra-high strength can be transformed into complex shapes, resulting in lightweight yet strong components. However, to comprehensively assess the crashworthiness of these components, an in-depth evaluation of their fracture toughness properties is essential. The present 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 behaviour was evaluated using the essential work of fracture (EWF) test methodology. Subsequently, the discussion involves a comparison of the absorbed energy with the fractography and microstructure features observed.

DOI Number: 10.33313/512/B0801
Product:
2024 CHS2 Conference Proceedings
PR-512-B0801
K. Maissara, F. Forouzan, P. Akerfeldt, P. Akerstrom, E. Vuorinen, M-L. Antti
May 27, 2024
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