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Impact of Reversed Austenite on the Impact Toughness of the High-Strength Steel of Low Carbon Medium Manganese

  • Characterization of Advanced High Strength Steels for Automobiles
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Abstract

We elucidate the relationship between the volume fraction of austenite and the Charpy impact toughness in a medium-Mn steel in terms of microstructural evolution with impact temperature. Different from retained austenite in the matrix after direct quenching, sub-micron lath-shaped morphology-reversed austenite in medium-Mn steel was produced by intercritical annealing. We found that reversed austenite steadily affected the fracture mode; only ductile fractures and dimples decreased with decreasing impact temperature. After the impact fracture test, the content of reversed austenite in the matrix increased slightly with a decreasing impact temperature due to the stability of the austenite grains caused by recrystallization of α′ martensite. Reversed austenite slightly decreased during the impact process with a decreasing impact temperature.

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Acknowledgements

The authors gratefully appreciate the financial support by the National High-tech R&D Program (863 Program) No. 2015AA03A501.

Funding

This study was funded by the National High-tech R&D Program (863 Program) (No. 2015AA03A501).

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Authors and Affiliations

  1. The State Key Laboratory of Rolling and Automation, Northeastern University, Shenyang, 110819, China

    Guanqiao Su, Xiuhua Gao, Dazheng Zhang, Linxiu Du & Jun Hu

  2. School of Materials Science and Engineering, Jiangsu University of Science and Technology, Zhenjiang, 212003, China

    Zhenguang Liu

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  1. Guanqiao Su
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  2. Xiuhua Gao
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  3. Dazheng Zhang
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  4. Linxiu Du
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Correspondence to Xiuhua Gao.

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Su, G., Gao, X., Zhang, D. et al. Impact of Reversed Austenite on the Impact Toughness of the High-Strength Steel of Low Carbon Medium Manganese. JOM 70, 672–679 (2018). https://doi.org/10.1007/s11837-017-2732-9

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  • DOI: https://doi.org/10.1007/s11837-017-2732-9

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