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Medium-Mn Martensitic Steel Ductilized by Baking

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Abstract

In this study, the microstructure and mechanical properties, especially the impacts of low-temperature tempering, of the medium-Mn martensitic steel were examined. The low-temperature tempering simulated paint baking in car manufacturing. Significant improvement of tensile ductility was achieved by baking, associating with a change from brittle to ductile fracture behavior. The ductilization was attributed to the carbon re-distribution during baking, as allowed by the high volume fraction of retained austenite (15 pct). The carbon distribution was characterized by Atom Probe Tomography. The baked medium-Mn martensitic steel presents an excellent strength–ductility combination, which is a promising candidate as next-generation high-performance steels for vehicle lightweighting.

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The raw/processed data required to reproduce these findings cannot be shared at this time as the data also form part of an ongoing study.

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Acknowledgments

Dr. Lai acknowledges the funding provided by the National Key R&D Program of China (Grant No. 2017YFA0204403), Natural Science Foundation of Jiangsu Province (Grant No. BK20180492), and the Fundamental Research Funds for the Central Universities (Grant No. 30917011106). Dr. Lu appreciates the experimental help from Jiawei Ma (China Science Lab, General Motors Global Research and Development). The authors acknowledge the facilities, and the scientific and technical assistance, of Microscopy Australia at the Australian Centre for Microscopy & Microanalysis, The University of Sydney (Sydney Microscopy & Microanalysis).

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Authors and Affiliations

  1. China Science Lab, General Motors Global Research and Development, Shanghai, 201206, China

    Q. Lu, J. Wang & H. Zhan

  2. Australian Centre for Microscopy & Microanalysis, and School of Aerospace, Mechanical and Mechatronic Engineering, The University of Sydney, Sydney, NSW, 2006, Australia

    M. Eizadjou, A. Ceguerra & S. Ringer

  3. Research and Development Center, Baoshan Iron and Steel Co. Ltd, Shanghai, China

    L. Wang

  4. Herbert Gleiter Institute of Nanoscience, Nanjing University of Science and Technology, Nanjing, China

    Q. Lai

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  1. Q. Lu
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Manuscript submitted December 18, 2018.

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Lu, Q., Eizadjou, M., Wang, J. et al. Medium-Mn Martensitic Steel Ductilized by Baking. Metall Mater Trans A 50, 4067–4074 (2019). https://doi.org/10.1007/s11661-019-05335-5

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