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Energy Absorption Mechanism of High-Strength Q&P and DP Steel Thin-Walled Structures

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Abstract

In order to research the energy absorption characteristics of high-strength steels in vehicles, the single-hat thin-walled structural components were made from quenching and partitioning (Q&P) steel and dual-phase (DP) steel so as to understand the differences and superiority in the energy absorption characteristics of various types of steel in the energy-absorbing box of current vehicles. Crushing experiments were performed with a testing machine equipped with a high-speed camera. The energy absorption mechanism of the two steels was investigated by means of transmission electron microscopy and electron back-scattered diffraction. The results showed that the energy absorption capacity of Q&P steel is better than that of DP steel, which can be observed from the different compression distances of the single-hat thin-walled structure. The major contribution in energy absorption of Q&P steel comes from the internally retained austenite-to-martensite transformation. The amount of retained austenite substantially reduces at the crushed part with large deformation. On the other hand, while there is a large amount of dislocation and quantity of plug in the crushed DP steel part, the energy stays inside the material without dissipating.

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Funding

This work was supported by Program of High-end CNC Machine Tools and Basic Manufacturing Equipment [number 2019ZX04002030]; the State Key Research and Development Program of China under Grant [number 2016YFB0101605].

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Authors and Affiliations

  1. Institute of Engineering Technology, University of Science and Technology, Beijing, Beijing, 100083, People’s Republic of China

    Dayuan Zhou & Zhenli Mi

  2. State Key Laboratory of Advanced Stainless Steel Materials, Taiyuan Iron & Steel (Group) Co. Ltd., Taiyuan, 030003, People’s Republic of China

    Mei Xu

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  1. Dayuan Zhou
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  2. Mei Xu
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Correspondence to Zhenli Mi.

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Zhou, D., Xu, M. & Mi, Z. Energy Absorption Mechanism of High-Strength Q&P and DP Steel Thin-Walled Structures. Trans Indian Inst Met 73, 1999–2006 (2020). https://doi.org/10.1007/s12666-020-02008-5

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  • DOI: https://doi.org/10.1007/s12666-020-02008-5

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