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Investigation on Hydrogen-Induced Delayed Fracture of Cold-Rolled DP980 Steels

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In this study, the phenomenon of hydrogen-induced delayed fracture of two cold-rolled DP980 steels with different chemical compositions was studied. The results show that the microstructure of both steels is composed of ferrite matrix, martensite-austenite islands and small amount of bainite. DP980-1 having higher contents of C and Si exhibits higher tensile strength, lower yield strength and higher elongation in comparison with DP980-2 having lower contents of C and Si. According to the results of slow strain rate tensile tests, the tensile strength of DP980-1 after hydrogen charging is reduced by 20.8%, while it is just 5.4% for DP980-2. Moreover, very fine dimples can still be observed in the fracture surface of DP980-2 after hydrogen charging, which indicates a good ductile. The main reasons leading to the better delayed fracture resistance of DP980-2 are the lower volume fraction of martensite-austenite islands, lower content of diffusible hydrogen and the grain refinement effects.

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Authors and Affiliations

  1. Shougang Research Institute of Technology, Beijing, 100043, China

    Yun Han, Shuang Kuang & Chunqian Xie

  2. Key Laboratory for Liquid–Solid Structural Evolution and Processing of Materials (Ministry of Education), Shandong University, Jinan, 250061, China

    Liang Chen

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  1. Yun Han
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  2. Liang Chen
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  3. Shuang Kuang
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  4. Chunqian Xie
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Correspondence to Liang Chen.

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Han, Y., Chen, L., Kuang, S. et al. Investigation on Hydrogen-Induced Delayed Fracture of Cold-Rolled DP980 Steels. J. of Materi Eng and Perform 26, 2024–2031 (2017). https://doi.org/10.1007/s11665-017-2636-4

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  • DOI: https://doi.org/10.1007/s11665-017-2636-4

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