Multiphase high strength steel forming and testing for robust Automotive lightweight Design
The modern automotive industry is constantly seeking lighter, safer, and more energy-efficient vehicles. One of the most promising solutions is represented by multiphase steels, which combine different microstructures to achieve high strength and excellent formability. This combination allows for the design of lighter vehicles, with lower fuel consumption and reduced emissions, directly contributing to more sustainable mobility.
Developed to meet the most stringent requirements of modern automotive design, Quenching and Partitioning (QP) steels offer an exceptional balance between mechanical strength and ductility. This allows automotive components to better absorb energy during impacts while maintaining structural integrity.
This research project analyzed the critical factors influencing the mechanical integrity of QP steels throughout their life cycle, with particular focus on hydrogen embrittlement (HE), a growing concern with the increased strength of AHSS steels. The study examined the role of microstructural constituents in the mechanisms of hydrogen trapping and embrittlement. Formability analyses were also conducted to assess the impact of hydrogen and microstructural anisotropy on deformation limits and crash performance. In parallel, the project addressed critical issues related to weldability, analyzing how thermal cycles alter the microstructure and susceptibility to HE. Testing and modeling ultimately guided the realization of a demonstrative B-pillar automotive component in QP1180, validating its formability and structural integrity under realistic conditions.
