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Mechanical Properties and Crash Worthiness of Ultrafine Grained Multi-Phase Steel Sheets for Automotive Body Applications
ISSN: 1946-3979, e-ISSN: 1946-3987
Published April 12, 2010 by SAE International in United States
Citation: Okitsu, Y., Naito, T., Takaki, N., Sugiura, T. et al., "Mechanical Properties and Crash Worthiness of Ultrafine Grained Multi-Phase Steel Sheets for Automotive Body Applications," SAE Int. J. Mater. Manuf. 3(1):237-245, 2010, https://doi.org/10.4271/2010-01-0438.
Mechanical properties, formability and crash worthiness of a new sheet steel having an ultrafine grained (UFG) multi-phase (MP) microstructure are shown. The fabricated UFG-MP steel showed significant work hardening caused by deformation induced martensitic transformation of retained austenite, which resulted in a combination of high strength and large tensile elongation. It was confirmed by dynamic collapse test and FEM simulation that the large work hardenability of the UFG-MP steel promoted compact mode collapse that improved the absorbed energy.